![](media/image1.jpeg){width="1.7in" height="0.9625in"}
![](media/image2.png)

Caribbean Area

# 

# Caribbean Area Phosphorus Index

# 

# *A Planning Tool to Assess and Manage P Movement*

High phosphorus (P) concentrations found in many surface waters
throughout Puerto Rico suggest that this may be the leading cause of
observed eutrophication. Because agricultural activities are one of many
nonpoint sources apparently contributing to P loading, it is important
to implement agricultural nutrient management plans. This must be done
judiciously because of the unique social and economic conditions that
prevail. One component of such plan is the assessment of P transport
from soil to water by the use of the Phosphorus Index (PI). The
Phosphorus Index (PI) is a site specific, qualitative vulnerability
assessment tool used by the USDA, Natural Resources Conservation Service
(NRCS) to determine when manure utilization may be based on a nitrogen
or phosphorus-based budget. The tool allows a conservation planner to
determine, from among a series of proposed manure application sites,
which ones are potentially most vulnerable to the off-site movement of
phosphorus. The original PI has been modified to consider the unique
pedologic and climatic conditions that prevail in the tropical
Caribbean. Modifications to the PI for tropical conditions also address
characteristics of highly weathered soils. The PI for Puerto Rico
considers both transport (soil erosion, runoff class, distance to
watercourse) and source (soil test P, fertilizer and organic P ratio and
application method and timing) characteristics.

**PHOSPHORUS CONCERNS IN THE TROPICAL ENVIRONMENT**

Factors affecting P losses from the landscape and movement to surface
water are grouped into transport factors. To assess P transport it is
necessary to examine soil erosion and runoff rates, P sorption to soil
particles and proximity of site to surface water. Since P is considered
immobile in most soils, soil erosion and runoff in areas with high soil
test P can pollute surface waters. However, the risk is lower if runoff
and erosion is minimized. Except in the coastal plains and valleys, the
steep topography on the island dominates soil landscape characteristics
(Map1) increasing P loss potential via erosion and runoff. With the
topographic characteristics of our soils it is obvious that most of the
P loss, in traditional cropland and overgrazed sites, is attached to
soil particles. If these conditions occur in close proximity to surface
water, impairment is likely. Thus, controlling erosion is of prime
importance in minimizing P movement. According to RUSLE estimates, soil
erosion rates may exceed 40 tons/acre/year in low residue conventional
tillage cropland with more than 30 percent slopes. A highly erodible
soil map unit list is in Section II of Caribbean Area Field Office
Technical Guide. Soil erodibility potential for soils in Puerto Rico is
shown in Map 2. The categories used in this map regroup highly erodible
land (HEL) into high or very high erosion potential and non HEL into low
or very low. The potentially HEL determinations are categorized as a
medium class. High category includes all deep red clayey soils formed on
20 to 40 percent slopes and K factor from 0.02 to 0.10 and other shallow
soils up to 20 percent slopes. The very high category includes soils
with K factor more than 0.10 formed on slopes over 20 percent, all soils
over 40 percent slopes with K factor from 0.02 to 0.10 and all rockland
complex exceeding 40 percent slope. Low and Very low category soils
include those on slopes from 0 to 2 percent. All soils with an aquic
moisture regime, and fluventic great group of Soil Taxonomy and others
with coarse textures are grouped in the low category.

The island exhibits an intriguing pedologic and mineralogical diversity
with soils presenting widely different P sorption -- desorption patterns
(Jones et al., 1982; Beinroth, 1982). Most highly weathered and alkaline
soils have high sorption potential, which could reduce P losses in
runoff. Based on soil survey data and soil classification of the soils
in Puerto Rico around 30 percent of soils in agricultural production
exhibit a high P sorption characteristic. Leaching in P deficient
subsoil with high sorption capacity is of less importance because soil
particles sorb much of the soluble P. Few exceptions may occur in
permeable coarse texture and organic soils with low ability to retain P.
Agricultural P sources include organic residues from manure and
inorganic fertilizers. In Puerto Rico most of the agricultural activity
is concentrated on ecologically fragile ecosystem, commonly exceeding
20% slopes where intense sudden rainstorms are common. Most of the
manure comes from poultry, dairy, and swine enterprises. The poultry
industry is concentrated in the south central part while dairy is in the
north coast, mostly in the Karst formation. The swine producers are
distributed throughout the island.

![](media/image3.png)

![](media/image4.jpeg){width="10.454330708661418in"
height="3.6992125984251967in"}![](media/image4.jpeg){width="2.658267716535433in"
height="3.1153543307086613in"}![](media/image5.jpeg){width="1.7881889763779528in"
height="1.852755905511811in"}

Effective management of P requires knowledge of soil properties, P
behavior in soils and information obtained from onsite soil and manure
test. In Puerto Rico, either the Bray 1, Bray 2 or Olsen P soils tests
have traditionally been used to evaluate plant available P. High long
term P application rates in the form of fertilizers or manure can
increase the soil test P levels. With higher P content present in the
soil, there is an increased risk of loss potential. Nevertheless, to
assure adequate crop yields in P deficient soils, often the application
rate may exceed more than twice the amount utilized by the crop. Thus,
heavy application of manure and fertilizer may need to be applied to
maintain optimum agronomic yields in highly weathered and alkaline
soils.

The risks of P loss increase with increasing P rate and surface
application in close proximity to surface water. Those sites with
highest probability for P loss merit specific management practices to
minimize their contribution to surface water. The key is to apply where
and when the risk of major runoff and erosion events is lowest.

# 

# **PHOSPHORUS INDEX CONCEPT**

The Phosphorus Index (PI) is an assessment tool that may be used by
resource managers and landusers to assess the risk of phosphorus (P)
losses from a field. A work group made up by Scientists from College of
Agricultural Sciences of the University of Puerto Rico and USDA -- NRCS
formed a working group to adapt and validate this technology to our
tropical environment. The purpose of the PI is to aid personnel from
Natural Resources Conservation, third party vendors, and other
environmental agencies in the decision-making processes involved in
designing animal by products conservation plans. The risk of P losses is
a function of transport and sources characteristics. The P index
considers eight field features and management practices, including three
transport characteristics which are: (1) soil erosion rate, (2) runoff
class, (3) distance to surface water, and buffer strips; and five source
characteristics which are: (1) soil test P factor, (2) fertilizer P
application ratio, fertilizer P application method and timing, organic P
application ratio, and organic P application method and timing.

The weighting factors (WF) show on Table 1 is based on the professional
judgement of the scientists that modified the PI. The lowest weighting
factor is assigned to the factor that has low relative importance to P
loss. For example, the fertilizer P application ratio and method are
assigned lower weighting factor compared to organic fertilizer because
organic sources nutrient content and balance of manure varies among
operations and over time and nitrogen based manure application may cause
P build up.

**Table 1. Weighting Factors of P Index Parameters**

  ------------------------------------------------------ ----------------
  **Parameters**                                         **Weighting
                                                         Factor**

  1\. Soil Erosion                                       1.0

  2\. Runoff Class                                       1.0

  3\. Distance to Surface Water and Buffer Strip Width   1.0

  4\. Soil Test P                                        1.0

  5\. Fertilizer P Application Ratio                     0.5

  6\. Fertilizer P Application Method and Timing         0.5

  7\. Organic P Application Ratio                        0.75

  8\. Organic P Application Method and Timing            1.0
  ------------------------------------------------------ ----------------

Each field features and management practices are assigned value rating
as shown on the next table.

**Table 2. Value Ratings of P Index Parameters**

  ---------------------------------------------------------------------------------------------------------------------
  **P index             **Value                                                                               
  Parameters**          Ratings                                                                               
                        (Points)**                                                                            
  --------------------- ------------ --------- --------- ------------ --------- --------- ---------- -------- ---------
                        **Very Low**           **Low**   **Medium**                       **High**   **Very   
                                                                                                     High**   

  **Transport           **0.6**      **0.7**                          **0.8**   **0.9**                       **1.0**
  Characteristics**                                                                                           

  **Site Source         **0.1**      **1**                            **2**     **4**                         **8**
  Characteristics**                                                                                           
  ---------------------------------------------------------------------------------------------------------------------

Multiplying the weighting factor by the value rating yields points for
that specific field feature or management practice. Caribbean Area P
Index shown on Table 3 takes into considerations all the above data.

The following formula describes the procedure used to compute the **PI**
rating.

**PI = ( (SE x C1) x (RC x C2 ) x (PSW x C3)) x ∑ (Source Characteristic
Rating x C~i~)**

**Where:**

**SE =** Soil Erosion rating

**C1** = Weighting coefficients for soil erosion

**RC =**Runoff Class rating

**C2 =** Weighting coefficients for runoff class

**PSW =** Distance to Surface Water/Buffer Strips rating

**C3 =** Weighting coefficients for Distance to Surface Water/Buffer
Strips

**C~i~ =** Weighting coefficients for each source characteristics

This formula separately evaluates the transport and source
characteristics of a site and combines them in a multiplicative manner.
This procedure allows having a better representation of site
vulnerability. A site could have a high rating of source characteristics
but if there is no P loss the vulnerability is low. Based on
multiplication of transport and source factor, the product is rank into
an overall category rating of Low, Medium, High or Very High. The final
ranking identifies fields where the risk of phosphorus movement is
relatively higher than other sites.

**Table 3. Caribbean Area P Index**

+-------------------+---+--------+--------+--------+--------+--------+
| > Caribbean Area  |   |        |        |        |        |        |
| > P Index         |   |        |        |        |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| **                | * | *      |        |        |        |        |
| Characteristics** | * | *Value |        |        |        |        |
|                   | W | Rat    |        |        |        |        |
|                   | F | ings** |        |        |        |        |
|                   | * |        |        |        |        |        |
|                   | * |        |        |        |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| **Transport**     |   | **Very | *      | **Me   | **     | **Very |
|                   |   | Low**  | *Low** | dium** | High** | High** |
|                   |   |        |        |        |        |        |
|                   |   | **(0.6 | **(0.7 | **(0.8 | **(0.9 | **(1.0 |
|                   |   | po     | po     | po     | po     | po     |
|                   |   | int)** | int)** | int)** | int)** | int)** |
+-------------------+---+--------+--------+--------+--------+--------+
| 1\. Soil Erosion  | 1 | \< 3   | \>3 ≤  | #####  | \> 10  | \> 15  |
| (tons/acre/year)  | . |        | 6      |        | ≤ 15   |        |
|                   | 0 |        |        | ###    |        |        |
|                   |   |        |        | ## \>  |        |        |
|                   |   |        |        | 6 ≤ 10 |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| 2\. Runoff Class  | 1 | ##     | ####   | ####   | High   | Very   |
|                   | . | ## Ver |        |        |        | High   |
|                   | 0 | y low/ | ##     | ####   |        |        |
|                   |   |        | ## Low | Medium |        |        |
|                   |   | Negl   |        |        |        |        |
|                   |   | igible |        |        |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| 3\. Distance to   | 1 | \> 100 | \> 100 | \> 100 | \> 100 | \< 100 |
| Surface           | . | feet   | feet   | feet   | feet   | feet;  |
|                   | 0 | of     | of     | of     | of     | no     |
| Water; Buffer     |   | high   | good   | medium |        | buffer |
| Strip Width       |   | stand  | stand  | or     | low    | strip  |
|                   |   | cover  | cove   | better | stand  |        |
|                   |   | (\>91% | r(81-- | stand  | cover  |        |
|                   |   | cover  | 90 %   | cover  | (\<    |        |
|                   |   | and \> | cover  | (\> 61 | 60%    |        |
|                   |   | 6"     | and \> | %      | cover  |        |
|                   |   | high); | 6"     | cover  | and    |        |
|                   |   |        | high); | and    |        |        |
|                   |   | \> 21  | 10 --  | \>6"   | \< 6"  |        |
|                   |   | feet   | 20     | high)  | high); |        |
|                   |   |        | feet   | ;      | no     |        |
|                   |   | of     | of     |        | buffer |        |
|                   |   | buffer | buffer | no     | strip  |        |
|                   |   | strip  | strip  | buffer |        |        |
|                   |   |        |        | strip  |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| **                | * | *      |        |        |        |        |
| Characteristics** | * | *Value |        |        |        |        |
|                   | W | Rat    |        |        |        |        |
|                   | F | ings** |        |        |        |        |
|                   | * |        |        |        |        |        |
|                   | * |        |        |        |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| **Site Source**   |   | **Very | *      | **Me   | **     | **Very |
|                   |   | Low**  | *Low** | dium** | High** | High** |
|                   |   |        |        |        |        |        |
|                   |   | **(0.1 | **(1   | **(2   | **(4   | **(8   |
|                   |   | po     | po     | poi    | poi    | poi    |
|                   |   | int)** | int)** | nts)** | nts)** | nts)** |
+-------------------+---+--------+--------+--------+--------+--------+
| 4\. Soil Test P   | 1 | Very   | Low    | #####  | High   | Very   |
| Level (PPM)       | . | low    |        |        |        | high   |
|                   | 0 |        |        | #      |        |        |
|                   |   |        |        | #### M |        |        |
|                   |   |        |        | edium  |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| 5\. Fertilizer P  | 0 | ≤1     | ≤ 2    | ≤ 4    | ≤ 6    | \> 6   |
| Application Ratio | . | time   | times  | times  | times  | times  |
|                   | 5 | crop   | crop   | crop   | crop   | crop   |
| (lb./acre)        |   | uptake | uptake | uptake | uptake | uptake |
|                   |   |        |        |        |        |        |
| FPR = Annual P    |   |        |        |        |        |        |
| application rate/ |   |        |        |        |        |        |
| P                 |   |        |        |        |        |        |
|                   |   |        |        |        |        |        |
| Crop uptake       |   |        |        |        |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| 6\. Fertilizer P  | 0 | None   | Incorp | Incorp | S      | S      |
| Application       | . | a      | orated | orated | urface | urface |
|                   | 5 | pplied | \< 1   | \< 1   | a      | a      |
| Method and Timing |   |        | week   | month  | pplied | pplied |
|                   |   |        | or     | after  | before | during |
|                   |   |        | t      | ap     | rainy  | rainy  |
|                   |   |        | rickle | plied; |        | season |
|                   |   |        | a      | or     | Season |        |
|                   |   |        | pplied | c      |        |        |
|                   |   |        |        | ontour |        |        |
|                   |   |        |        | banded |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| 7\. Organic P     | 0 | ≤ 1    | ≤ 2    | ≤ 4    | ≤ 6    | \> 6   |
| Application       | . | time   | times  | times  | times  | times  |
|                   | 7 | crop   | crop   | crop   | crop   | crop   |
| Ratio (lb./acre)  | 5 | uptake | uptake | uptake | uptake | uptake |
|                   |   |        |        |        |        |        |
| OPR = Annual P    |   |        |        |        |        |        |
| application rate/ |   |        |        |        |        |        |
| P                 |   |        |        |        |        |        |
|                   |   |        |        |        |        |        |
| Crop uptake       |   |        |        |        |        |        |
+-------------------+---+--------+--------+--------+--------+--------+
| 8\. Organic P     | 1 | None   | Incorp | Incorp | S      | S      |
| Application       | . | a      | orated | orated | urface | urface |
|                   | 0 | pplied | \< 1   | \> 1   | a      | or     |
| Method and Timing |   |        | week   | month  | pplied | spr    |
|                   |   |        | after  | after  | and    | inkler |
|                   |   |        | a      | a      | not    | a      |
|                   |   |        | pplied | pplied |        | pplied |
|                   |   |        | or     | or     | Incorp |        |
|                   |   |        | spr    | c      | orated | during |
|                   |   |        | inkler | ontour | or     | rainy  |
|                   |   |        | a      | banded | when   | season |
|                   |   |        | pplied | in     | a      |        |
|                   |   |        | during | crop   | pplied |        |
|                   |   |        | dry    | field  | via    |        |
|                   |   |        | season |        | irri   |        |
|                   |   |        |        | or     | gation |        |
|                   |   |        |        | when   | exc    |        |
|                   |   |        |        | spr    | essive |        |
|                   |   |        |        | inkler | runoff |        |
|                   |   |        |        | a      | occurs |        |
|                   |   |        |        | pplied |        |        |
|                   |   |        |        | no     |        |        |
|                   |   |        |        | runoff |        |        |
|                   |   |        |        | occurs |        |        |
+-------------------+---+--------+--------+--------+--------+--------+

DESCRIPTION OF FIELD FEATURES AND MANAGEMENT PARAMETERS

1.  **Soil Erosion** is the detachment and movement of soil particles
    predicted from Universal Soil Loss Equation (RUSLE). The value
    category is given in tons of soils per acre per year
    (ton/acre/year). The rating is higher as soil erosion increases.
    This parameter considers the risk of movement of sediment bound P
    suspended in water runoff. A Caribbean Area RUSLE handbook should be
    used to calculate soil erosion.

########  A = R \* K \* LS \* C \* P 

> Where:
>
> A = Average annual soil loss (tons/acre/year)

######## R = Runoff and erosion factor

> K = Soil erodibility factor
>
> LS = Slope length/steepness factor
>
> C = Cover and management factor
>
> P = Supporting practice factor

2.  **Runoff Class** considers the relative risk of surface transport of
    P from a site by water flow over the land surface to water bodies.
    These groupings are based on runoff producing characteristics of the
    soil. The current runoff class used in this P indexing is a function
    of land slope and soil permeability. The method is adapted from
    National Soil Survey Handbook. Soil survey data is used to determine
    the classes. The runoff classes are:

> Negligible -- N Medium - M\
> Very low -- VL High - H\
> Low -- L Very high - VH
>
> The result of using the matrix provides the value categories: Very
> Low, Low, Medium, High, and Very High. Distribution of soil runoff
> classes is shown on Map 3. Map Soil runoff class is derived from the
> following table:

**Table 4. Surface Runoff Classes**

+----------+-----------+-----------+-----------+-----------+---+-----------+
| **Slope  | **Soil    |           |           |           |   |           |
| (%)**    | Per       |           |           |           |   |           |
|          | meability |           |           |           |   |           |
|          | Class**   |           |           |           |   |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
|          | **Very    | **Mod     | **Mod     | **Slow**  |   | **Very    |
|          | Rapid**   | erately** | erately** |           |   | Slow**    |
|          |           |           |           |           |   |           |
|          |           | **Rapid   | **Slow    |           |   |           |
|          |           | and**     | and**     |           |   |           |
|          |           |           |           |           |   |           |
|          |           | **Rapid** | **M       |           |   |           |
|          |           |           | oderate** |           |   |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
| **C      | **N**     | **N**     | **N**     | **N**     | * |           |
| oncave** |           |           |           |           | * |           |
|          |           |           |           |           | N |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | * |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
| **\< 2** | **N**     | **N**     | **N**     | **L**     | * |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | M |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | * |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
| **2 --   | **N**     | **VL**    | **L**     | **M**     | * |           |
| 5**      |           |           |           |           | * |           |
|          |           |           |           |           | H |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | * |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
| **5 --   | **VL**    | **L**     | **M**     | **H**     | * |           |
| 12**     |           |           |           |           | * |           |
|          |           |           |           |           | V |           |
|          |           |           |           |           | H |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | * |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
| **12 --  | **VL**    | **L**     | **M**     | **H**     | * |           |
| 20**     |           |           |           |           | * |           |
|          |           |           |           |           | V |           |
|          |           |           |           |           | H |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | * |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+
| **\>     | **L**     | **M**     | **H**     | **VH**    | * |           |
| 20**     |           |           |           |           | * |           |
|          |           |           |           |           | V |           |
|          |           |           |           |           | H |           |
|          |           |           |           |           | * |           |
|          |           |           |           |           | * |           |
+----------+-----------+-----------+-----------+-----------+---+-----------+

> Permeability classes for specific soils can be obtained from a
> published soil survey or from local USDA -- NRCS field offices. Runoff
> class determination arranged by soil survey and mapping units is
> included in the Appendix 1.

3.  **Distance to Surface Water and Buffer Strip Width** considers the
    distance in feet from the phosphorus application site to surface
    water and filtering effect of a vegetative buffer strip. Surface
    waters include any permanent streams, springs, lakes, sinkholes,
    wetlands and ditches or waterways that flow intermittently through
    the year. Buffer strip (BS) considers the filtering effect of a
    vegetative filter strip at all areas where water will flow from the
    field, including well-managed pastureland. Filter strips, field
    borders, contour buffer strips, vegetative barrier grassed waterway
    and riparian forest buffers are all examples of vegetative buffers
    or covers. The value class is established based on distance to
    surface water, buffer strip width and cover management condition.
    The medium value is based on the average distance required by local
    Environmental Quality Board (EQB). Plant vigor of permanent
    vegetation may reduce or increase runoff velocity and infiltration.
    In a similar ecosystem, a well-managed pastureland might have a
    lower runoff and higher infiltration than an overgrazed condition.
    Sites with distances and buffer width greater or lower than average
    specified on the PI will receive higher or lower rating,
    respectively. The buffering effect of vegetative strips may
    compensate distance to surface water.

4.  **Soil Test P Level (STPL)** is the soils P nutrient level relative
    to crop production expressed in part per million (PPM). From an
    environmental standpoint, soil test P content is not intended to
    predict the amounts of P leaving land and going into surface waters,
    as it cannot be assumed that there is a direct relationship between
    the STPL and nutrient pollution potential. This is because the
    movement of P can be affected by soil properties such as soil pH,
    clay content, mineralogy, among others. Nevertheless, there exists
    quantitative relationship between soil test P extracted by agronomic
    soil test and water soluble P. Preliminary work by scientist at the
    University of Puerto Rico has developed empirical relationship
    between agronomic soil test and water soluble P. From this work,
    preliminary threshold soil test P levels based on the maximum
    allowable point source limits established by the local Environmental
    Quality Board which is 1ppm of total P have been developed.

The range of value used for soil test P interpretation on the table
below were chosen so that they would approximately represent the P
fertility level of soils throughout Puerto Rico for the most commonly
grown crops. The very high-risk class may exceed about four to eight
times the expected agronomic STP critical level for the most commonly
grown crops.

**Table 5. Soil Test P Interpretation Categories by Soils Groups**

  -------------- ------------------ --------- --------- -------------- ---------- ---------
  **Soils        **Soil Test P                                                    
  Groups**       Interpretation**                                                 

                 **Soil Test        **Very    **Low**   **Moderate**   **High**   **Very
                 (PPM)**            Low**                                         High**

  **Strongly     **Olsen or Bray**  **0 -     **11 -    **31 - 130**   **131 -    **\>
  Acid High P                       10**      30**                     300**      300**
  Sorption**                                                                      

  **Moderate and **Bray**           **0 -     **11 -    **31 - 55**    **56 -     **\>
  Slightly Acids                    10**      30**                     100**      100**
  Low to Medium                                                                   
  P Sorption**                                                                    

                 **Olsen**          **0 -     **21 -    **41 - 90**    **91 -     **\>
                                    20**      40**                     200**      200**

  **Non Acid Low **Olsen or Bray**  **0 -     **11 -    **31 - 70**    **71 -     **\>
  to Medium P                       10**      30**                     150**      150**
  Sorption**                                                                      
  -------------- ------------------ --------- --------- -------------- ---------- ---------

Table 5 uses the P Sorption Capability Group (PSCG) system to
characterize three soils groups based on potential P sorption and soil
reaction. The PSCG describes the soil potential to fix phosphorus.
Phosphate in the fixed P pool may have a very little impact on the
fertility of the soil. The soil grouping is based on soil mineralogy and
texture. P sorption is higher in strongly acid soils with oxidic and
kaolinitic mineralogy and in alkaline soils with carbonatic mineralogy.
Each of these reactions will result in very insoluble compounds of
phosphate that are generally not available to plants. Continuous
application of more P increases the fertility of the soil, but much of
the added P becomes fixed and unavailable. The sorption intensity based
on mineralogy for the soils in the Caribbean Area: Oxidic \> Carbonatic
\> Kaolinitic \> Mixed \> Montmorrillonitic \> Siliceous. The sorption
capacity of organic soils is considered to be very low. Soil texture is
another factor that influence soil sorption. The sorption is higher with
an increase in soil clay. Soils with a coarse texture have a lower
sorption. High P saturation level of most tropical soils can reduce the
amount of soluble P in runoff. The combination of mineralogy and
textural classes serve to create different sorption groups varying from
very low to very high. A soil with higher sorption capacity may receive
a lower rating value. The P sorption capability group may be estimated
by the use of Table 6, Phosphorus Sorption Soil Capability Group
Classification System.

Map 4 shows distribution of PSCG categories in Puerto Rico. The user may
use the soil classification made by soil survey and mapping units
included in the appendix 1. Also, soil map unit is correlated with a
soil group to facilitate STPL interpretation.

![](media/image7.jpeg){width="10.010236220472441in"
height="6.5in"}![](media/image5.jpeg){width="1.7543307086614173in"
height="1.8783464566929133in"}

**Table 6. Phosphorus Sorption Soil Capability Group Classification
System**

+-----------+-----------------------------------------------------------+
| **P       |                                                           |
| hosphorus |                                                           |
| Sorption  |                                                           |
| Soil      |                                                           |
| C         |                                                           |
| apability |                                                           |
| Group     |                                                           |
| Inter     |                                                           |
| pretation |                                                           |
| Cat       |                                                           |
| egories** |                                                           |
+-----------+-----------------------------------------------------------+
| *         | **Descriptions**                                          |
| *Sorption |                                                           |
| Class**   |                                                           |
+-----------+-----------------------------------------------------------+
| **Very    | A.  All soils with various mineralogy that have over 70%  |
| Low**     |     of sand fraction in the                               |
|           |                                                           |
|           | surface horizon (sand and loamy sand).                    |
|           |                                                           |
|           | B.  All organic soils.                                    |
+-----------+-----------------------------------------------------------+
| **Low**   | A.  Clayey soils with montmorrillonitic mineralogy.       |
|           |                                                           |
|           | B.  B. Other soils with mixed mineralogy that have less   |
|           |     than 20% clay but no more                             |
|           |                                                           |
|           | than 70% sand (SL, L, SIL and SI textural classes).       |
+-----------+-----------------------------------------------------------+
| *         | A.  Soils with mixed mineralogy that have more than 20%   |
| *Medium** |     clay (SCL, CL, SICL, SC,                              |
|           |                                                           |
|           | SIC and C textural classes).                              |
|           |                                                           |
|           | B.  Soils with oxidic and carbonatic mineralogy that have |
|           |     no more than 70% sand                                 |
|           |                                                           |
|           | and less than 20% clay (SL, L and SIL textural classes).  |
|           |                                                           |
|           | C.  C. Other kaolinitic soils with SCL, CL, SICL, SL, L   |
|           |     and SIL textural classes                              |
+-----------+-----------------------------------------------------------+
| **High**  | A.  Clayey acid soils with Kaolinitc mineralogy           |
|           |                                                           |
|           | B.  Other soils with oxidic or carbonatic mineralogy that |
|           |     have clay between 20 and                              |
|           |                                                           |
|           | 35%                                                       |
|           |                                                           |
|           | C.  (SCL, CL and SICL textural classes).                  |
+-----------+-----------------------------------------------------------+
| **Very    | Clayey soils with more than 35% clay (C, SC and SIC       |
| High**    | textural classes) with oxidic or carbonatic mineralogy.   |
+-----------+-----------------------------------------------------------+

5.  **Fertilizer P Application Ratio** is the amount of P in pound per
    acre (lb./acre) that is applied to the soil, divided by the amount
    of P removed by the crop. The amount applied does not include
    phosphorus from organic sources. The form of phosphorus as well as
    the quantity is an important predictor of soluble P in runoff.
    Phosphorus uptakes for tropical crops are in Agricultural Waste
    Management Field Handbook, Chapter 6, Table 6 - 6 Caribbean Area
    Supplement.

**FPR = Annual P application ratio/ P crop uptake**

6.  **Fertilizer P Application Method and Timing** considers if the P
    fertilizer is surface applied, incorporated or irrigated. It also
    considers the amount of time that the P fertilizer is exposed on the
    soil surface and the historical weather seasons when most rainfall
    occurs. Fertilizer incorporation after application reduces the
    potential for P losses.

7.  **Organic P Application Ratio** is the function of total P in
    manure, in pound of per acre (lb./acre) of total P that is applied
    to the soil divided by the P crop uptake. An analysis of organic
    material is necessary to determine the total P content of the
    manure. This parameter includes all sources of phosphorus whether
    originating from organic sources such as animal manure, compost or
    poultry litter. Most of the total will be released over a period of
    time depending on soil and climatic condition. Phosphorus uptakes
    for tropical crops are in Agricultural Waste Management Field
    Handbook, Chapter 6, Table 6 - 6 Caribbean Area Supplement.

**OPR = Annual Organic P application ratio / P crop uptake**

8.  **Organic P Application Method and Timing** considers if the organic
    P material is surface applied, incorporated or irrigated and the
    amount of time that manure is exposed on the soil surface and the
    historical weather seasons when most rainfall occurs. Manure should
    be incorporated after application to reduce the potential for P
    losses.

> **USE OF THE P INDEX**

The P Index was developed to rank the relative risk of occurrence, and
should not be interpreted as an assurance of actual P loss. The ranking
of a site does not reflect a water quality standard or represent a
regulatory tool. It is a planning tool that can be used in resource
management planning to identify sites that would require direct
conservation efforts to minimize P transfer to surface water. A PI
analysis helps the planner assist the producer in making nutrient
management decisions.

The PI numerical value is interpreted in Table 6 and delineates if the
nutrient management plan should be based on nitrogen or phosphorus. The
numerical result of the PI is a qualitative rating (Low, Medium, High,
or Very high). The transport value rating of 0.25 is the product of a
very low erosion rate (0.6), very low runoff (0.6), and low distance to
surface water and buffer strip width (0.7). The transport value rating
of 0.5 is the product of all the transport characteristics (soil
erosion, runoff class, and distance to surface water; buffer strip
width) having a medium value rating of 0.8. The transport parameter
yield 0.25 and 0.5 numerically depict the environmental vulnerability of
average farm condition in Puerto Rico. As an example, multiplication of
0.25 by Very High source characteristics (30 points) results in a rating
of 7.5 while Very High transport rating (1) multiplied by Low site
source characteristic (3.75) gives a 3.75 rating. These value ratings
are used in Table 7 to set P index rating of organic and inorganic low
and medium categories. The same approach is used to set the other
categories. Some values rating were slightly adjusted, such as increase
the value from 7.5 to 7.7, to reflect actual condition. Separate values
rating for organic and inorganic and organic or inorganic were set up to
avoid rating underestimate when inorganic fertilizer is not applied. In
this particular case the overall numerical rating is low but the risk of
using organic amendment remain the same.

### 

### Table 7. Interpretation of the P Index

+-------+-------+-----------------------------------------------------+
| ##    |       | ###                                                 |
| ####  |       |  Generalized Interpretation of P Index for the Site |
| Ratin |       |                                                     |
| g P i |       |                                                     |
| ndex  |       |                                                     |
+-------+-------+-----------------------------------------------------+
| #     | ##    |                                                     |
| ##### | ####  |                                                     |
|  Orga | Organ |                                                     |
| nic & | ic or |                                                     |
|  Inor |       |                                                     |
| ganic | ###   |                                                     |
|       |  Inor |                                                     |
|       | ganic |                                                     |
+-------+-------+-----------------------------------------------------+
| **≤   | **≤   | **LOW** potential for P movement from the site. If  |
| 3.7** | 2.7** | farming practices are maintained at current level   |
|       |       | there is a low probability of an adverse impact to  |
|       |       | waterbodies.                                        |
+-------+-------+-----------------------------------------------------+
| **\>  | **\>  | **MEDIUM** potential for P movement from the site.  |
| 3 .7  | 2.7 ≤ | The chance for an adverse impact to waterbodies     |
| ≤     | 5.5** | exists. Soil and water conservation practices as    |
| 7.7** |       | well as P management practices should be taken to   |
|       |       | lessen the risk of P movement and potential water   |
|       |       | quality degradation.                                |
+-------+-------+-----------------------------------------------------+
| **\>  | **\>  | **HIGH** potential for P movement from the site.    |
| 7.7 ≤ | 5.5 ≤ | The chance of organic material and nutrients        |
| 15**  | 11**  | getting to waterbodies is likely unless remedial    |
|       |       | action is taken. Soil and water conservation        |
|       |       | practices as well as P management plan are          |
|       |       | necessary to reduce the risk of P movement and      |
|       |       | water quality degradation.                          |
+-------+-------+-----------------------------------------------------+
| **\>  | **\>  | **VERY HIGH** potential for P movement from the     |
| 15**  | 11**  | site and an adverse impact on waterbodies. All      |
|       |       | necessary soil and water conservation practices,    |
|       |       | plus P management plan must be put in place to      |
|       |       | avoid the potential for water quality degradation.  |
+-------+-------+-----------------------------------------------------+

For each qualitative rating a description is given for the level of
concern that each specifically assessed field has for P loss potential.
Some general guidance is given for each qualitative level as to the
intensity and type of remedial action or mitigation that would be
necessary to reduce P loss risk.

Reviewing each individual site characteristic rating will identify
whether the cause and severity of the risk warrants management
attention. In a field with a Low or Medium vulnerability rating, it may
be possible to manage animal manure using a nitrogen-based budget to
determine manure application rates. On sites with a High or Very high
rating, it may be desirable to manage animal manure based a phosphorus
budget. When this occurs, manure application rate should be planned as a
function of estimated phosphorus uptake in harvested plant biomass for
the plant growing season or entire crop rotation. The application rate
should be reduced as available soil P levels increase. Phosphorus may be
applied at rates consistent with Table 8.

**Table 8. Application rate according with P Index rating**

  ------------------ ----------------------------------------------------
  **P Index rating** **P application rate**

  **Low**            **Nitrogen Based**

  **Medium**         **Nitrogen Based**

  **High**           **Phosphorus Based ( 1 - 2 times P crop uptake )**

  **Very High**      **Phosphorus Based ( ≤1 time P crop uptake )**
  ------------------ ----------------------------------------------------

Using the planning process, each individual site characteristic can be
used to communicate with the landowner the potential for loss. The
conservation planner can identify those site characteristics that have
the greatest influence in determining the final vulnerability rating,
and may be targeted for remedial action. Management actions and
conservation practices can then be planned and implemented to reduce the
P loss risk.

The P index assessment in a proposed manure application sites should
considers soil diversity and distribution and any other significant
variation in P Index components at farm level. However, it must be kept
in mind that the P Index is only a crude estimator to rank sites on the
relative risk of loss of P to surface water. Therefore, while the
site-specific microscale approach can have advantages, it may not be
seen to have value by all users.

**BEST MANAGEMENT PRACTICES FOR REDUCING SITE VULNERABILITY**

A best management practice (BMP) is a practice or combination of
practices used in a conservation management system to reduce site
vulnerability. The table below lists the most common BMP used in the
Caribbean Area to prevent nonpoint source pollution of surface water by
agricultural P. It also displays the potential environmental effect that
each BMP has on site vulnerability. BMP may decrease, increase or have
no effects on site conditions. These BMP may minimize P losses from soil
to water or improve management practices. BMP and corresponding effects
could be used to reevaluate the current conditions to determine what
factors are creating the highest levels of concern. Once these factors
have been determined, an onsite assessment should be made to evaluate
the feasibility of making changes to reduce the vulnerability rating to
an acceptable level. In general any practice which reduces soil erosion
and runoff and improves nutrient management will reduce the P loss from
landscape. This may require several trials and a combination of BMP to
achieve the desired level. When site vulnerability cannot be reduced
enough to apply animal waste, an alternate site would need to be
considered.

**Table 9. Environmental Effects of Best Management Practices on P
index**

**Parameters**

+---------------------+-------+-------+-------+-------+-------+-------+
| **Best Management   | **Env |       |       |       |       |       |
| Practices**         | ironm |       |       |       |       |       |
|                     | ental |       |       |       |       |       |
|                     | Ef    |       |       |       |       |       |
|                     | fects |       |       |       |       |       |
|                     | on P  |       |       |       |       |       |
|                     | index |       |       |       |       |       |
|                     | Pa    |       |       |       |       |       |
|                     | ramet |       |       |       |       |       |
|                     | ers** |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
|                     | *     | **Run | *     | *     | **P   | **P   |
|                     | *Soil | off** | *Surf | *Soil | App   | App   |
|                     | Eros  |       | ace** | Test  | licat | licat |
|                     | ion** |       |       | P     | ion** | ion** |
|                     |       |       | **Wa  | Le    |       |       |
|                     |       |       | ter** | vel** | **Ra  | **Met |
|                     |       |       |       |       | tio** | hod** |
+---------------------+-------+-------+-------+-------+-------+-------+
| Conservation Cover  | \-    | \-    | \-    | 0     | \-    | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Conservation Crop   | \-    | \-    | 0     | \-    | \-    | 0     |
| Rotation            |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Contour Farming     | \-    | \-    | 0     | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Diversion           | \-    | \-    | 0     | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Field Border        | \-    | \-    | \-    | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Filter Strip        | \-    | \-    | \-    | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Grassed Waterway    | \-    | \-    | \-    | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Hillside Ditch      | \-    | \-    | 0     | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Irrigation Water    | \-    | \-    | 0     | \-    | 0     | \-    |
| Management          |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Land Mechanical     | \-    | \-    | 0     | 0     | 0     | \-    |
| Treatment           |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Manure Transfer     | 0     | \-    | 0     | 0     | 0     | \-    |
+---------------------+-------+-------+-------+-------+-------+-------+
| Nutrient Management | 0     | 0     | \-    | \-    | \-    | \-    |
+---------------------+-------+-------+-------+-------+-------+-------+
| Pasture and Hayland | \-    | \-    | 0     | \-    | \-    | 0     |
| Planting            |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Residue Management, | \-    | \-    | 0     | 0     | \-    | 0     |
| No Till             |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Residue Management, | \-    | \-    | 0     | 0     | \-    | 0     |
| Mulch Till          |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Residue Management, | \-    | \-    | 0     | 0     | \-    | 0     |
| Seasonal            |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Riparian Forest     | \-    | \-    | \-    | 0     | 0     | 0     |
| Buffer              |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Roof Runoff         | \-    | \-    | \-    | 0     | 0     | 0     |
| Management          |       |       |       |       |       |       |
+---------------------+-------+-------+-------+-------+-------+-------+
| Use Exclusion       | 0     | 0     | \-    | 0     | 0     | 0     |
+---------------------+-------+-------+-------+-------+-------+-------+
| Waste Utilization   | 0     | 0     | \-    | \-    | \-    | \-    |
+---------------------+-------+-------+-------+-------+-------+-------+

**Legend:** **+** **Increase effect; - Decrease effect; 0 - No effect**

######## PROCEDURE TO CALCULATE PHOSPHORUS INDEX

######## Step 1 -- Inventory procedure and tools

The following is a list of all the information and procedure needed to
make determination, along with where that information is found.

A.  **Field observation and measurements**

-   Identify predominant soil type in field from soil survey.

-   Measure distance to surface water and buffer width and percent cover
    stand.

-   Measure slope length and steepness and estimate cover stand percent
    in field.

-   List existing best management practices, including conservation
    practices that meet NRCS standards.

-   Identify all major resources problems affecting nutrient management.

B.  **Farm operator data**

-   Soil test report

-   Manure test report

-   Amount and type of fertilizer and manure applied

-   Application method and timing of fertilizer and manure applied

-   Crop rotation

C.  **Tools**

-   National Agronomy Manual

-   P Index Worksheets

-   RUSLE Handbook of the Caribbean Area

-   Field Office Technical Guide Sections I - V

-   Agricultural Waste Management Manual

-   Soil Survey

**Step 2 - Determine the value for each field feature and management**

This step serves as a basic guide to arrange and use the information
collected to determine the P index factor. The procedure is separated
into transport and site source characteristics.

**A. Transport Characteristics**

-   Forecast **Soil Erosion** using RUSLE.

-   Determine **Runoff Class** using the table provided or selects the
    value from the database in the Appendix.

```{=html}
<!-- -->
```
-   Use measures distance to surface water and buffer width distance and
    percent cover stand to determine **Distance to Surface Water and
    Buffer Strip Width**.

**B. Site Source Characteristics**

-   Use soil test report to determine **Soil Test P Level** factor.

**Step 3 -- P index Rating**

-   Use the **Caribbean Area P index Assessment Worksheets** (Table 3)
    to find the class value rating that best describes the site
    condition determined.

-   Score the rating for each factor in the field no. column of the
    **Caribbean Area P Index Rating Worksheet** in the Appendix 2**.**

-   Compute the P index following the procedure describes in the
    **Caribbean Area P Index Rating Worksheet.**

-   Assess overall rating using tables 7 and 8.

-   Recommend BMP to reduce P loss using Table 9. Environmental Effects
    of Best Management Practices on P index Parameters.

    **Appendix 1. Phosphorus Index Transport Data by Soil Survey**

+-------------+-------------+-------------+-------------+-------------+
| Arecibo     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| AaC         | Aceitunas   | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AcC         | Aceitunas   | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AdF2        | Adjuntas    | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AgC         | Algarrobo   | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AlB         | Almirante   | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AlC         | Almirante   | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AmB         | Almirante   | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AmC         | Almirante   | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AnB         | Almirante   | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AnC         | Almirante   | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AoD2        | Alonso      | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AoE2        | Alonso      | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AoF2        | Alonso      | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| ArC         | Arecibo     | VL          | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| Ba          | Bajura      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| BcB         | Bayamon     | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| BcC         | Bayamon     | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| BsB         | Bayamon     | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| BsC         | Bayamon     | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| ByB         | Bayamon     | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| ByC         | Bayamon     | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CaF         | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CbF         | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CcD         | Caracoles   | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CcE         | Caracoles   | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CeC         | Carrizales  | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Cf          | Catano      | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| ClD2        | Colinas     | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| ClE2        | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| ClF2        | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CmF2        | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cn          | Coloso      | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| CoE         | Consejo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

Soils Group 3: Non Acid Low to Medium P Sorption

+-------------+-------------+-------------+-------------+-------------+
| Arecibo     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| CoF         | Consejo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CpE         | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CpF         | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CrC         | Corozal     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CsC         | Corozo      | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CtB         | Coto        | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CtC         | Coto        | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CuF         | Cuchillas   | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CvF         | Cuchillas   | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| DaD2        | Daguey      | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| EaB         | Espinosa    | L           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| EaC         | Espinosa    | L           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| EbB         | Espinosa    | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| EbC         | Espinosa    | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| EcB         | Espinosa    | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| EcC         | Espinosa    | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Ga          | Garrochales | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| GeC         | Guerrero    | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| HmE         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HmF         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| InD         | Ingenio     | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| InE         | Ingenio     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| IsC         | Islote      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Ja          | Jareales    | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| JoC         | Jobos       | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| JuD2        | Juncal      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JuE2        | Juncal      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LME         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LME         | Maricao     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LcE2        | Lirios      | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LcF2        | Lirios      | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LgD         | Los Guineos | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LgE         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LgF         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MaF2        | Maraguez    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| McF         | Maricao     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Arecibo     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| MmF         | Matanzas    | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MnB         | Matanzas    | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MoC2        | Moca        | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MoD2        | Moca        | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MoE2        | Moca        | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MpF2        | Morado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MuE         | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MuF         | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaD         | Naranjo     | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaE         | Naranjo     | L           | Soil Group2 | VH          |
+-------------+-------------+-------------+-------------+-------------+
| NaF         | Naranjo     | L           | Soil Group  | VH          |
|             |             |             | 2           |             |
+-------------+-------------+-------------+-------------+-------------+
| Pa          | Palmar      | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| PeF         | Pellejas    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PhC2        | Perchas     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PhD2        | Perchas     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Re          | Reilly      | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| RlC         | Rio Lajas   | VL          | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| RsF         | San German  | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| RtF         | Tanama      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SaB         | Sabana Seca | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SgD         | San German  | H           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SgF         | San German  | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SmF         | San         | VH          | Soil Group3 | H           |
|             | Sebastian   |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| SnC         | Santa Clara | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SoC         | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SoD         | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SoF         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SpD         | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SpF         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SrF         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| TaB         | Tanama      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| TaC2        | Tanama      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| TaD2        | Tanama      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Tb          | Tiburones   | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| To          | Toa         | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| VaB         | Vega Alta   | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Arecibo     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| VaC2        | Vega Alta   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VcB         | Vega Alta   | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| VcC2        | Vega Alta   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VeB         | Vega Baja   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Vg          | Vigia       | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Vm          | Vivi        | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| VoC2        | Voladora    | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VoD2        | Voladora    | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VoE2        | Voladora    | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Humacao     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| AcC         | Aceitunas   | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Ad          | Aguadilla   | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Ag          | Aguadilla   | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| AmB         | Amelia      | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AmC2        | Amelia      | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| An          | Arenales    | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Ar          | Arenales    | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Ba          | Bajura      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Bc          | Bajura      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CbD2        | Caguabo     | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CbF2        | Caguabo     | M           | Soil Group  | H           |
|             |             |             | 2           |             |
+-------------+-------------+-------------+-------------+-------------+
| CdB         | Candelero   | L           | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| CdC2        | Candelero   | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Ce          | Cartagena   | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Cf          | Catano      | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| CgC2        | Cayagua     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CgD2        | Cayagua     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| ClB         | Coamo       | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| ClC         | Coamo       | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Co          | Coloso      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Cr          | Coloso      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Cs          | Corcega     | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| DaC         | Daguao      | M           | Soil Group2 | M           |
|             | Variant     |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DcE2        | Daguao      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| DeC2        | D           | M           | Soil Group2 | M           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DeE2        | D           | M           | Soil Group2 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DgF2        | D           | M           | Soil Group2 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DgF2        | Guayama     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| DrF         | D           | M           | Soil Group2 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| FaC         | Fajardo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| FaC2        | Fajardo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Fo          | Fortuna     | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| FrA         | Fraternidad | L           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| FrB         | Fraternidad | L           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Humacao     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| GvF         | Guayabota   | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| GvF         | Ciales      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| GvF         | Picacho     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| GyC2        | Guayama     | M           | Soil Group2 | M           |
|             | Variant     |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| HmB         | Humacao     | L           | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| HtE2        | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HtF2        | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HuF         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| InE2        | Ingenio     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| JaB         | Jacana      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| JaC2        | Jacana      | M           | Soil Group  | M           |
|             |             |             | 3           |             |
+-------------+-------------+-------------+-------------+-------------+
| JgE2        | Jagueyes    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JuC         | Junquitos   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LeE2        | Limones     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LoC2        | Lirios      | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LrE2        | Lirios      | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LsD         | Los Guineos | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LsE2        | Los Guineos | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LsF2        | Los Guineos | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LyF         | Los Guineos | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LyF         | Yunque      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MaB         | Mabi        | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MaC2        | Mabi        | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MaD2        | Mabi        | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| McA         | Machete     | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| McB         | Machete     | M           | Soil Group  | VL          |
|             |             |             | 2           |             |
+-------------+-------------+-------------+-------------+-------------+
| Me          | Maunabo     | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MlC         | Mayo        | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MrB         | Meros       | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MuD2        | Mucara      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MuE2        | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaE2        | Naranjito   | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaF2        | Naranjito   | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PaE2        | Pandura     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PaF2        | Pandura     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Humacao     |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| PdF         | Pandura     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PeC2        | Parcelas    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PlB         | Paso Seco   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PmD2        | Patillas    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PmE2        | Patillas    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Po          | Poncena     | M           | Soil Group  | L           |
|             |             |             | 3           |             |
+-------------+-------------+-------------+-------------+-------------+
| PrC2        | Pozo Blanco | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Re          | Reilly      | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Rp          | Reparada    | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| RrB         | Rio Arriba  | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| RrC2        | Rio Arriba  | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SaE2        | Sabana      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SaF2        | Sabana      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ta          | Talante     | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| TeE         | Teja        | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Tt          | Toa         | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| UpF         | Utuado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| UpF         | Picacho     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Va          | Vayas       | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Vc          | Vayas       | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| VeB         | Vega Alta   | M           | Soil Group  | L           |
|             |             |             | 2           |             |
+-------------+-------------+-------------+-------------+-------------+
| VeC         | Vega Alta   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VgA         | Vega Baja   | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| VlC         | Via         | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VmC         | Vieques     | L           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| VmE2        | Vieques     | L           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Vs          | Vives       | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| VvA         | Vives       | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| VvB         | Vives       | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Vw          | Vivi        | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| YuF2        | Yunes       | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Lajas Soil  |             |             |             |             |
| Survey P    |             |             |             |             |
| index       |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| AcD         | Aguilita    | VH          | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AcE         | Aguilita    | VH          | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ag          | Aguirre     | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AmB         | Amelia      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AmB         | Maguayo\*   | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AmC2        | Amelia      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AmC2        | Maguayo\*   | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Ao          | Amelia      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AsB         | Bahia       | VL          | Soil Group3 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| Ca          | Cartagena   | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Cc          | Cartagena   | M           | Soil Group3 | L           |
|             | Variant     |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DeC         | D           | M           | Soil Group3 | M           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DeD         | D           | M           | Soil Group3 | M           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DeF         | D           | M           | Soil Group3 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| Fe          | Fe          | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| FrA         | Fraternidad | L           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| FrB         | Fraternidad | L           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Ft          | Fraternidad | L           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| FvA         | Fraternidad | L           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| FvB         | Fraternidad | L           | Soil Group  | M           |
|             |             |             | 3           |             |
+-------------+-------------+-------------+-------------+-------------+
| Gc          | Guanica     | L           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Gf          | Guayabo     | VL          | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| GuD         | Guayama     | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| GuF         | Guayama     | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| JaB         | Jacana      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| JaC         | Jacana      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JaC2        | Jacana      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JaD2        | Jacana      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JcB         | Jacana      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| JcC         | Jacana      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MaD2        | Mariana     | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MaE2        | Mariana     | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PaA         | Palmarejo   | L           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| PaB         | Palmarejo   | L           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| PaC2        | Palmarejo   | L           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Lajas Soil  |             |             |             |             |
| Survey P    |             |             |             |             |
| index       |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| PcB         | Poncena     | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PcC2        | Poncena     | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PoA         | Pozo Blanco | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| PzB         | Pozo Blanco | H           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| PzC         | Pozo Blanco | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PzD         | Pozo Blanco | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Sa          | San Anton   | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Sc          | San Anton   | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Se          | San Anton   | M           | Soil Group3 | N           |
|             | Variant     |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| SgD         | San German  | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SgF         | San German  | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SmE         | San German  | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Sn          | Santa       | L           | Soil Group3 | M           |
|             | Isabel      |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| SoA         | Sosa        | VL          | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| SsB         | Sosa        | M           | Soil Group3 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| SsD2        | Sosa        | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Tc          | Teresa      | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Va          | Vayas       | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+

\* Complex component

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Mayagüez    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| AaC2        | Aceitunas   | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AbC2        | Aceitunas   | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AcD         | Aguilita    | VH          | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AcE         | Aguilita    | VH          | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AdE2        | Aibonito    | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AoD         | Anones      | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AoE2        | Anones      | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AoF2        | Anones      | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ba          | Bajura      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| BcB         | Bejucos     | H           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| BeB         | Bejucos     | M           | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| CaC         | Cabo Rojo   | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CaC2        | Cabo Rojo   | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CbF2        | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CcB         | Camaguey    | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cd          | Catano      | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Ce          | Catano      | H           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CfC2        | Cidral      | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| ClD         | Colinas     | H           | Soil Group  | M           |
|             |             |             | 3           |             |
+-------------+-------------+-------------+-------------+-------------+
| ClE         | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| ClF2        | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CmD         | Colinas     | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CmE         | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cn          | Coloso      | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| CoE         | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CoF2        | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cr          | Corcega     | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| CtB2        | Cotito      | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CuB2        | Coto        | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CuC2        | Coto        | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CvB         | Coto        | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CwF         | Cuchillas   |             |             | H           |
+-------------+-------------+-------------+-------------+-------------+
| DaD2        | Daguey      | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| DaE2        | Daguey      | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Mayagüez    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DcD2        | Delicias    | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| DeC         | D           | M           | Soil Group2 | M           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DeD         | D           | M           | Soil Group2 | M           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DeF         | D           | M           | Soil Group2 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| Du          | Dique       | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Es          | Espinal     | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| GnC         | Guanajibo   | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| GoC         | Guanajibo   | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| GuB         | Guerrero    | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| HmD2        | Humatas     | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| HmE2        | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HmF2        | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HuE         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ig          | Igualdad    | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| JaC         | Jacana      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Jd          | Jaucas      | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| JoB         | Jobos       | M           | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| JuD2        | Juncal      | M           | Soil Group  | M           |
|             |             |             | 2           |             |
+-------------+-------------+-------------+-------------+-------------+
| LaB2        | Lares       | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| LaD2        | Lares       | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LuD2        | Los Guineos | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LuF2        | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MaB         | Mabi        | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MaC2        | Mabi        | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| McF2        | Malaya      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MdB         | Maleza      | VL          | Soil Group2 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| Mh          | Mani        | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Mn          | Mani        | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| MoD2        | Maresua     | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MoF2        | Maresua     | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MpD2        | Mariana     | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MpE2        | Mariana     | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MrF2        | Maricao     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MsB         | Matanzas    | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MtB         | Matanzas    | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MuC2        | Moca        | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Mayagüez    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| MuD2        | Moca        | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MuD3        | Moca        | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MuE3        | Moca        | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MvC         | Montegrande | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MwD2        | Morado      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MwE2        | Morado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MwF2        | Morado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MxC         | Mucara      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MxD2        | Mucara      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MxE2        | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MxF2        | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaD         | Naranjo     | L           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NcD2        | Nipe        | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| PaC2        | Palmarejo   | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PeD2        | Perchas     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PlE2        | Plata       | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PlF2        | Plata       | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| QuD2        | Quebrada    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| QuE2        | Quebrada    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| QuF2        | Quebrada    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Re          | Reilly      | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| RlB         | Rio Lajas   | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| RpC2        | Rio Piedras | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| RpD2        | Rio Piedras | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| RsD2        | Rosario     | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| RsE2        | Rosario     | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| RsF2        | Rosario     | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SaD         | San German  | H           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SaE         | San German  | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| ScB         | San German  | M           | Soil Group3 | VL          |
+-------------+-------------+-------------+-------------+-------------+
| SdF2        | San         | VH          | Soil Group3 | H           |
|             | Sebastian   |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| SeB         | Santa Clara | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SmE2        | Santa Marta | VH          | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Sn          | Santoni     | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SrD         | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SrE         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Mayagüez    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| SsD2        | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| SsE2        | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| StB         | Soller      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| StC         | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| StD         | Soller      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| StE         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ta          | Talante     | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| TcB2        | Tanama      | M           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| TcC2        | Tanama      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| TcD2        | Tanama      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| TcE2        | Tanama      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| ToA         | Toa         | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Ts          | Toa         | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| VoD2        | Voladora    | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| VoE2        | Voladora    | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| VrC2        | Voladora    | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Ponce Soil  |             |             |             |             |
| Survey P    |             |             |             |             |
| index       |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| AaF2        | Adjuntas    | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AgD         | Aguilita    | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AgF         | Aguilita    | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AhF         | Aguilita    | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AnE2        | Alonso      | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AnF2        | Alonso      | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CbF2        | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CdF         | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CoD         | Callabo     | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CoE         | Callabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CoF2        | Callabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cr          | Cintrona    | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Ct          | Constancia  | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CuF2        | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cx          | Cortada     | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| CyB         | Cuyon       | L           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| DaD         | Daguey      | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| EnC         | Ensenada    | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Fe          | Fe          | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| FtB         | Fraternidad | L           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| FtC2        | Fraternidad | L           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| GoF         | Guanabano   | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HmE2        | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HmF2        | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HxF         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Jg          | Jacaguas    | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| JnC         | Jacana      | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JzD         | Juana Diaz  | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JzE         | Juana Diaz  | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Ponce Soil  |             |             |             |             |
| Survey P    |             |             |             |             |
| index       |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| LeC         | Lares       | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LmF2        | Lirios      | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LnB         | Llanos      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| LnC2        | Llanos      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LuE         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LuF         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LyFX        | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LyFX        | Maricao     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LnB         | Llanos      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| LnC2        | Llanos      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LuE         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LuF         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LyFX        | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LyFX        | Maricao     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LzFX        | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LzFX        | Maricao     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ma          | Machuelo    | H           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MeF2        | Maraguez    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MkF2        | Maricao     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Mr          | Meros       | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| MsC         | Montegrande | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MtE2        | Morado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MtF2        | Morado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MuD2        | Mucara      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MuE2        | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MuF2        | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PaB         | Paso Seco   | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PeF2        | Pellejas    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| QeD2        | Quebrada    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| QeE2        | Quebrada    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| QeF2        | Quebrada    | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Re          | Reilly      | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Sa          | San Anton   | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Se          | Serrano     | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+

> ^1^ **Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| Ponce Soil  |             |             |             |             |
| Survey P    |             |             |             |             |
| index       |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| Te          | Teresa      | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| To          | Toa         | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| TuF         | Tuque       | M           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| YcB         | Yauco       | H           | Soil Group3 | L           |
+-------------+-------------+-------------+-------------+-------------+
| YcC         | Yauco       | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| San Juan    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| AaB         | Aceitunas   | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AaC         | Aceitunas   | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AbD         | Aibonito    | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| AbE         | Aibonito    | VH          | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| AmB         | Almirante   | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| AmC         | Almirante   | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Ba          | Bajura      | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| BmB         | Bayamon     | H           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| CaE         | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CaF         | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CbF         | Caguabo     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Ce          | Candelero   | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| ClC         | Catalina    | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Cn          | Catano      | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Co          | Cayagua     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CrD2        | Colinas     | H           | Soil Group3 | M           |
+-------------+-------------+-------------+-------------+-------------+
| CrE2        | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CrF2        | Colinas     | H           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Cs          | Coloso      | M           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| CuE         | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CuF         | Consumo     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| CzC         | Corozal     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| DaC         | Daguey      | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| DaD         | Daguey      | VH          | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| DeF         | D           | M           | Soil Group2 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| DgF         | D           | M           | Soil Group2 | H           |
|             | escalabrado |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| Dm          | Dique       | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| Dr          | Durados     | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| Es          | Estacion    | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| GuF         | Guayama     | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Hm          | Humacao     | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| HtE         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| San Juan    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| HtF         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| HuF         | Humatas     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| JaE2        | Jagueyes    | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JnD2        | Juncal      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| JuC         | Juncos      | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| JuD         | Juncos      | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LaB         | Lares       | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| LaC2        | Lares       | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| LmE         | Limones     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LmF         | Limones     | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LoF2        | Lirios      | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LsE         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| LsF         | Los Guineos | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MaA         | Mabi        | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MaB         | Mabi        | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MaC         | Mabi        | L           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MlF         | Malaya      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MoF         | Maricao     | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Mp          | Martin Pena | VL          | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+
| MsB         | Matanzas    | VH          | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MtB         | Montegrande | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| MtC         | Montegrande | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MuF2        | Morado      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MxD         | Mucara      | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| MxE         | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| MxF         | Mucara      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaD2        | Naranjito   | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| NaE2        | Naranjito   | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| NaF2        | Naranjito   | M           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| PaD         | Pandura     | L           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| PaE         | Pandura     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PaF         | Pandura     | L           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| PeF         | Pellejas    | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Re          | Reilly      | L           | Soil Group2 | N           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

+-------------+-------------+-------------+-------------+-------------+
| San Juan    |             |             |             |             |
| Soil Survey |             |             |             |             |
| P index     |             |             |             |             |
| Transport   |             |             |             |             |
| Data        |             |             |             |             |
+-------------+-------------+-------------+-------------+-------------+
| **Map       | **Soil      | **P         | **Soil Test | **Runoff**  |
| Symbol**    | Series**    | hosphorus** | P ^1^       |             |
|             |             |             | Level**     | **Class**   |
|             |             | *           |             |             |
|             |             | *Sorption** | **Groups**  |             |
|             |             |             |             |             |
|             |             | **C         |             |             |
|             |             | apability** |             |             |
|             |             |             |             |             |
|             |             | **Group**   |             |             |
+-------------+-------------+-------------+-------------+-------------+
| RoB         | Rio Arriba  | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| RoC2        | Rio Arriba  | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| RpD2        | Rio Piedras | H           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| RpE2        | Rio Piedras | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| RpF2        | Rio Piedras | H           | Soil Group1 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SaF         | Sabana      | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| ScB         | Sabana Seca | M           | Soil Group2 | H           |
+-------------+-------------+-------------+-------------+-------------+
| Sm          | Saladar     | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| SoE         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| SoF         | Soller      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| TaF         | Tanama      | M           | Soil Group3 | H           |
+-------------+-------------+-------------+-------------+-------------+
| To          | Toa         | M           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| TrB         | Torres      | VL          | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| VaB         | Vega Alta   | M           | Soil Group1 | L           |
+-------------+-------------+-------------+-------------+-------------+
| VaC2        | Vega Alta   | M           | Soil Group1 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Vg          | Vega Baja   | M           | Soil Group2 | L           |
+-------------+-------------+-------------+-------------+-------------+
| VkC2        | Via         | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| Vv          | Vivi        | L           | Soil Group3 | N           |
+-------------+-------------+-------------+-------------+-------------+
| YeE         | Yunes       | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+
| YeF         | Yunes       | M           | Soil Group2 | M           |
+-------------+-------------+-------------+-------------+-------------+

**^1^ Soils Group 1: Strongly Acid High P Sorption**

**Soils Group 2: Moderate and Slightly Acids Low to Medium P Sorption**

**Soils Group 3: Non Acid Low to Medium P Sorption**

**Appendix 2. Caribbean Area Phosphorus Index Rating Worksheet**

<table>
<colgroup>
<col style="width: 34%" />
<col style="width: 7%" />
<col style="width: 7%" />
<col style="width: 7%" />
<col style="width: 2%" />
<col style="width: 6%" />
<col style="width: 7%" />
<col style="width: 8%" />
<col style="width: 2%" />
<col style="width: 5%" />
<col style="width: 8%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="11">Caribbean Area P Index Rating Worksheet</td>
</tr>
<tr class="even">
<td>Name:</td>
<td colspan="4">Tract no:</td>
<td colspan="4">Farm no :</td>
<td colspan="2">Date:</td>
</tr>
<tr class="odd">
<td>Evaluator :</td>
<td colspan="10"><strong>Value Ratings</strong></td>
</tr>
<tr class="even">
<td rowspan="2"><p><strong>Field Features and</strong></p>
<p><strong>Management Parameters</strong></p></td>
<td colspan="2">Field no. _____</td>
<td colspan="3">Field no. _____</td>
<td colspan="2">Field no. _____</td>
<td colspan="3">Field no. _____</td>
</tr>
<tr class="odd">
<td>Current</td>
<td><h3 id="planned">Planned</h3></td>
<td>Current</td>
<td colspan="2"><h3 id="planned-1">Planned</h3></td>
<td>Current</td>
<td><h3 id="planned-2">Planned</h3></td>
<td colspan="2">Current</td>
<td><h3 id="planned-3">Planned</h3></td>
</tr>
<tr class="even">
<td colspan="11"><h3 id="a.-transport-factors">A. Transport
Factors</h3></td>
</tr>
<tr class="odd">
<td>1. Soil Erosion</td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td>2. Runoff Class</td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td><p>3. Distance to Surface Water and</p>
<p>Buffer Strip Width</p></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td><strong>Subtotal A Factors = 1 x 2 x 3</strong></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td colspan="11"><strong>B. Site Source Factors</strong></td>
</tr>
<tr class="even">
<td>4. Soil Test P</td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td>5. Fertilizer P Application Ratio</td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td><p>6. Fertilizer P Application Method and</p>
<p>Timing</p></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td>7. Organic P Ratio</td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td><p>8. Organic P Application Method and</p>
<p>Timing</p></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td><strong>Subtotal B Factors = 5 + 6 + 7 + 8</strong></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td><strong>PI = Subtotal A x Subtotal B</strong></td>
<td></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
</tbody>
</table>

P Index Workgroup:

**José A Castro, Agronomist**

USDA -- NRCS, Caribbean Area

PO Box 364868

San Juan, P.R. 00936 - 4868

Phone: 787 -- 766 -- 5206 x 226; Fax: 787 -- 766 -- 5987

E -- Mail:
[jose.castro@pr.usda.gov](mailto:D_Sotomayor@rumac.upr.clu.edu)

David Sotomayor, Assistant Professor of Soil Fertility

Agronomy and Soils Department

UPR -- RUM, PO Box 9030

Mayaguez, P.R. 00681 - 9030

Phone: 787 -- 832 -- 4040 x 3734; Fax: 787 -- 265 -- 0860

E -- Mail: <D_Sotomayor@rumac.upr.clu.edu>

Gustavo Martínez, Associate Professor of Soil Chemistry

Agronomy and Soils Department

PO Box 21360

San Juan, P.R. 00928

Phone: 787 -- 767 -- 9705 x 2068, 2350; Fax: 787 -- 756 -- 8329

E -- Mail: <tavomarti@hotmail.com>

Luis Olivieri, Research Assistant Professor of Soil Science

Agronomy and Soils Department

UPR -- RUM, PO Box 9030

Mayaguez, P.R. 00681 - 9030

Phone: 787 -- 832 -- 4040 x 2092; Fax: 787 -- 833 -- 7765

E -- Mail: <olivieri@ece.uprm.edu>

**REFERENCES**

*A Phosphorus Assessment Tool*; Technical Note Engineering Series No.
1901; USDA-SCS, South National Technical Center, Ft. Worth, TX.

Beinroth, F.H. , 1982. *Some highly weathered soils of Puerto Rico, 1.
Morphologhy , formation and classification*. Geoderma. 27: 261 -- 266.

Havlin, J.L., Beaton, J.D., Tisdale, S.L. , and W.L. Nelson. 1999. Soil
Fertility and Fertilizers.

Jones, R.C., Hudnall, W.H., and Saki, W.S. *Some highly weathered soils
of Puerto Rico, 1. Morphologhy , formation and classification*.
Geoderma. 27: 75 -- 137.

Lemunyon, J.L., & Gilbert, R.G. 1993. *The concept and need for a
phosphorus assessment tool.* J. Prod. Agric. 6:483-486.

Muñiz -- Torres, O. 1992. *Uso de Fertilizantes en Puerto Rico: Enfoques
prácticos. Guía Técnica*. SEA -- UPR -- RUM.

Muñoz, M.A., Peña, L., Figueroa, T., and Hallorans J. M. O. 1992.
*Comparison of available P extracting methods for selected Puerto Rican
soils.* Proc. Plant Stress in Trop. Environ. 67-70. Prentice Hall
Inc.Upper Saddle River, N.J.

Sims. J.T. 2000. *Soil test Phosphorus: Bray and Kurtz* P. 1 P. 13 --
14; in G.M. Pierzinsky Ed., *Methods of Phosphorus analysis for soils,
sediments, residuals, and waters.* Southern Cooperative Series Bulletin
no. 396.

Sims. J.T. 2000. *Soil test Phosphorus: Olsen P. P. 20* -- 21; in G.M.
Pierzinsky Ed., *Methods of Phosphorus analysis for soils, sediments,
residuals, and waters.* Southern Cooperative Series Bulletin no. 396.

Snyder, C.S., Sharpley, A. N., Bruulsema, T. W., Beegle, D.B.
*Site-specific Use of the Environmental Phosphorus Index concept*,
Site-Specific Management Guidelines-SSMG-1; Potash & Phosphate
Institute.

Sotomayor-Ramírez, D., Martínez, G. A., and Olivieri, L. J. 2000.
*Phosphorus status of stream - waters in Puerto Rico: 1989-1997.*
Proceedings Programa Cooperativo para el Mejoramiento de Cultivos y
Animales. mayo de 2000.

Gburek W.J. , Sharpley, A.N. , Heathwaite, L. , and Folmar G. J. 2000.
*Phosphorus Management at the Watershed Scale: A modification of the
Phosphorus Index*. J. Environmental Qual. 29:130-144.

USDA -NRCS. 2000. Caribbean Area Field Office Technical Guide, Section
IV