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Nutrient Use in Cropland Agriculture

(Commercial Fertilizer and Manure):

Nitrogen and Phosphorus - Working Paper No. 14

Charles H. Lander, USDA-NRCS

Biological Conservation Sciences Division

Washington, D.C.

David Moffitt, USDA-NRCS

South Central Regional Office

Fort Worth, Texas

February 1996

Contents

Outline

Prefatory note

Introduction

Trends

Status

References

Appendix I--Computational Factors

Appendix II--State and Crop Tables

Outline

I. Introduction

Trends

Cropland Acres Planted, Harvested, Fertilized

Cropland 1982-1987

Cropland 1987-1992

A. 

B. Conservation Reserve Program Acreage, 1987 and 1992

C. Acreage Conservation Reserve, 1982-1992

D. Trends in Grazing Land Fertilized, 1982-1992

Commercial Fertilizer Use

Nitrogen 1982-1987

Nitrogen 1987-1992

Phosphate 1982-1987

Phosphate 1987-1992

E. 

Commercial Nitrogen and Phosphate Fertilizer Application Rates for Selected Crops, 1982-1992

Corn

Wheat

Soybeans

Cotton

Rice

Other Crops

F. 

Animal Production, 1982 and 1992

Cattle and Calves

Dairy Cows and Replacements

Hogs and Pigs

Chickens (Layers)

Chickens (Broilers)

Turkeys

G. 

H. Summary

II. 

Status

A. Commercial Nitrogen and Phosphate Fertilizer Consumption, 1992

Commercial Nitrogen and Phosphate Fertilizer Utilization

(Total; Selected Crops; Other Uses ( 1992)

B. 

Animal Populations; Manure, Nitrogen, Phosphorus Production, 1992

Estimating Organic Nitrogen and Phosphorus

a. Category 1 Losses

b. Category 2 Losses

Cattle and Calves

Dairy Cows and Replacements

Chickens (Layers)

Chickens (Broilers)

Hogs and Pigs (Breeders and Market)

Turkeys

C. 

III. 

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Summary

Commercial Nitrogen and Phosphate Fertilizer Utilization

for Thirty-six Selected Crops in Thirty-four Selected States, 1992

Asparagus Other Lettuce

Lima Beans, Fresh Cantaloupe

Snap Beans, Fresh Honeydew Melons

Snap Beans, Processed Watermelons

Broccoli Dry Onions

Cabbage, Fresh Green Peas, Processed

Cabbage, Processed Bell Peppers

Carrots Irish Potatoes

Cauliflower Rice

Celery Soybeans

Field Corn Spinach, Fresh

Sweet Corn, Fresh Spinach, Processed

Sweet Corn, Processed Strawberries

Upland Cotton Tomatoes, Fresh

Cucumbers, Fresh Tomatoes, Processed

Cucumbers, Processed Durum Wheat

Eggplant Spring Wheat

Head Lettuce Winter Wheat

Summary

D. 

IV. References

V. Appendix I - Computational Factors

VI. Appendix II - State and Crop Tables

Prefatory Note

In the original plan of this report, a third appendix was to be included which would present the results of

county-level case studies made in Lancaster County, Pennsylvania; Washington County, Iowa; Sampson County,

North Carolina; and Cuming County, Nebraska. These case studies will discuss in detail the balance between the

organic sources of nitrogen and phosphorus in each county and the total nutrient needs of the crops grown in the

same area. They are now expected to appear as a separate working paper in this series.

Introduction

This report documents information about crop production, the sale and use of commercial fertilizers, growth and

shifts in animal production, trends in the use of nitrogen and phosphorus on selected crops, and the status in

1992 of the use of nitrogen and phosphorus on thirty-six crops for which detailed information is collected by

USDA. According to the degree to which information was available, comparisons have been made for the period

1982 to 1992 either on an annual basis, or for each of the 5-year periods 1982(1987 and 1987(1992, or showing

net differences over the 10 years. The information presented here has been drawn from a variety of sources

within and outside USDA. Those sources include:

Census of Agriculture, 1987 and 1992, published every 5 years by the U.S. Department of Commerce, Bureau

of the Census

1992 Agricultural Chemical Usage Summary for Vegetables and Field Crops, published by USDA-National

Agricultural Statistics Service (NASS)

1992 & 1993 Crop Production Summaries, published annually by USDA-NASS

Agricultural Statistics--1985, published by USDA-NASS

1993 Animal Production Summaries, published by USDA-NASS

Commercial Fertilizers--1993, published by Tennessee Valley Authority, National Fertilizer and Environmental

Research Center

Fertilizer Use and Price Statistics, 1960-91, published annually by USDA-Economic Research Service (ERS)

Agricultural Resources--Inputs, Situation and Outlook Report, February 1993, published by USDA-ERS

Donald L. Van Dyne and Conrad B. Gilbertson, Estimating U.S. Livestock and Poultry and Nutrient Production,

USDA Economics, Statistics, and Cooperatives Service, ESCS 1 2, March 1978

No attempt has been made to define the process or details by which referenced data was collected or summarized

by the collecting agencies. Such information is available from the following sources:

Tennessee Valley Authority

National Fertilizer and Environmental Research Center

P.O. Box 1010

Muscle Shoals, Alabama 35660

United States Department of Agriculture

Economic Research Service

Natural Resources and Environment Division, Room 524

1301 New York Avenue, NW

Washington, D.C. 20005-4788

United States Department of Agriculture

National Agricultural Statistics Service

14th & Independence Avenue, Room 5906

Washington, D.C. 20250

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United States Department of Commerce

Bureau of the Census

Washington, D.C. 20233

Data are presented in two ways in this report. Data summarized nationally are presented in the body of the

report. State-specific data are presented separately in Appendix II. The reader is cautioned that the term

nutrients used here should be construed as meaning nitrogen (N) and phosphate (P2O5), the two nutrients most

commonly linked to identified water quality problems. The term agricultural production systems should be

interpreted to mean nitrogen and phosphate use on the following identified crops. These are the crops on which

USDA gathered detailed information about nutrient utilization in 1992.

Asparagus Cucumbers (Fresh) Potatoes (Irish)

Barley Cucumbers (Processing) Potatoes (Sweet)

Beans (Lima, fresh) Eggplant Rice

Beans (Snap, fresh) Flaxseed Rye

Beans (Snap, processing) Lentils Safflower

Beans (Dry) Lettuce (Head) Sorghum (Grain)

Broccoli Lettuce (Other) Soybeans

Cabbage (Fresh) Melons (Cantaloupe) Spinach (Processing)

Cabbage (Processing) Melons (Honeydew) Spinach (Fresh)

Canola Melons (Watermelons) Strawberries

Carrots Mustard Sugar beets

Cauliflower Oats Sugar cane

Celery Onions (Dry) Sunflower

Corn (Grain, all purposes) Peanuts Tomatoes (Fresh)

Corn (Sweet, fresh) Peas (Austrian) Tomatoes (Processing)

Corn (Sweet, processing) Peas (Dry) Wheat (Durum)

Corn (Silage) Peas (Green, processing) Wheat (Other, spring)

Cotton (Upland) Peppers (Bell) Wheat (Winter)

To the degree to which information is either available or can be extrapolated, this report documents the amount

of commercial nitrogen and phosphate fertilizer used on these crops in relation to the total amount sold as

documented by TVA. With the exception of discussion of acres of grazing land fertilized (range and pastureland),

discussion is limited to the use of fertilizer on cropland, as defined in the Census of Agriculture, or to the use of

nutrients (N and P2O5) on cropland on the previously mentioned crops for which detailed nutrient use information

is available. The abbreviation N/A is used throughout this document to indicate situations where data was not

available.

Trends

Trends in Cropland Acres Planted, Harvested, and Fertilized: 1982-1992

Nutrients are an integral input into almost all agricultural production systems. The analysis of the trends and

current importance of the use of nutrients in agricultural production was initiated by reviewing trends in the

number of cropland acres planted, harvested, and fertilized over the period 1982-1992. Planted acres were

estimated by adding harvested cropland acres and cropland acres on which all crops failed. Table 1 cites specific

data for the years 1982, 1987, and 1992.

Table 1. Cropland acreage planted, harvested, and fertilized

Cropland acres

Planted Harvested Fertilized

 -----------------(1,000 acres)-----------------

1982 331,192.2 326,306.5 210,340.2

1987 284,862.1 281,223.9 195,134.8

1992 302,086.7 295,914.3 209,456.9

Source of data: U.S. Department of Commerce, Bureau of the Census, 1990, 1994

CROPLAND, 1982-1987

During the period from 1982 to 1987, reductions occurred in all three categories. The number of planted acres

decreased by 46.3 million, the number of harvested acres decreased by 45.1 million, and the number of fertilized

acres decreased by 15.2 million. Decreases in the number of planted and harvested acres occurred in all states

except Alaska. Decreases in the number of cropland acres fertilized occurred in 41 states. The remaining nine

states reported increases in the number of cropland acres fertilized during this period.

CROPLAND, 1987-1992

During the period from 1987 to 1992, increases occurred in all three categories. Planted acres increased by about

17.2 million, the number of acres harvested increased by about 14.9 million, and the number of acres fertilized

increased by about 14.4 million. The number of acres planted in 1992 was about 29.1 million fewer than were

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planted in 1982. The number of acres harvested in 1982, 1987, and 1992 as a function of acres planted remained

relatively constant at about 98 to 99 percent of acres planted. The number of fertilized acres showed some

increase as a function of acres planted, increasing from 63.5 percent of acres planted in 1982 to 68.5 percent in

1987 and to 69.4 percent in 1992. State-specific data for planted, harvested, and fertilized acres are presented in

appendix tables 1 through 3 on pages 36-41.

Conservation Reserve Program (CRP)

The Conservation Reserve Program (CRP) was started in 1986. The goal of the program was to remove from

production land with inherent properties that made it susceptible to serious erosion problems. Enrollment in the

CRP has risen to 36.4 million acres in 1993 since the first signup was held in 1986. Through the fifth signup, held

in July 1987, about 13.7 million acres were under CRP contract. An additional 22.7 million acres were enrolled in

CRP through the twelfth signup, held in 1993. Figure 1 shows CRP enrollment from 1986 through 1992. Statespecific CRP data are shown in appendix table 4 on page 42.

Acreage Conservation Reserve (ACR)

Although it has received less public notice than the CRP, the Acreage Conservation Reserve (ACR) has been

responsible for the annual idling of cropland that would otherwise be planted. Figure 1 shows ACR land idled from

1983 through 1992. Land idled annually in the ACR varied from a low of 11.1 million acres in 1982 to a high of

60.5 million acres in 1987; the spike in 1983 was due to the Payment-In-Kind program (see below). No statespecific data are presented for ACR acreage.

The goal of ACR is to reduce the production of program crops, such as wheat, feed grains, upland cotton and

Egyptian long-staple cotton, and rice, to produce a better stocks to use ratio in the marketplace. Producers

enrolling in the acreage reduction program were required to reduce the planting of an enrolled program crop by a

specified percentage of the crop acreage base for that crop, if the Secretary of Agriculture determined that such

reduction was necessary to improve the stocks to use ratio. There were 26.7 million acres designated as ACR in

1994.

Figure 1 Acres enrolled in

Acreage Conservation

Reserve and Conservation

Reserve Program,

1982-1992

Trends in Grazing Land

Fertilized, 1982-1992

During the period from 1982 to

1987 the number of acres of

grazing land fertilized increased

by about 1.4 million acres,

slightly under 10 percent. From

1987 to 1992 acres fertilized

increased by 1.2 million acres,

about 7.5 percent. Specific

data are cited for the years

1982, 1987, and 1992.

Individual state data are given

in appendix table 5 on page 44.

Table 2 Grazing land fertilized

1982 1987 1992

Acreage (1,000 acres) 14,547.2 15,949.0 17,165.9

Source of data: U.S. Department of Commerce, Bureau of the Census, 1990, 1994

Trends in Commercial Nitrogen and Phosphate Fertilizer Use

Commercial synthetic fertilizers account for the majority of nutrients used in most agricultural production

systems, as well as in most other plant production systems. Figure 2 documents trends in the total consumption

of commercial nitrogen and phosphate fertilizers for the period 1982 through 1992.

NITROGEN, 1982-1987

During this period the consumption of commercial nitrogen fertilizers decreased from about 10.98 to about 10.21

million nutrient tons. The sharp one-year drop in nitrogen fertilizer consumption that occurred in 1983 can be

attributed to the one-year USDA Payment-In-Kind (PIK) program implemented through the ASCS to reduce the

quantities of various commodities being stored by USDA. The PIK program affected the production of corn,

sorghum, oats, wheat, barley, rice, and upland cotton in 1983, when an estimated 75.7 million acres were

diverted from the production of these crops as a result of the program. This compares to about 10.7 million

diverted acres in 1982 and 25.9 million diverted acres in 1984.

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The first five CRP signups also likely impacted the consumption of commercial nitrogen fertilizers during this

period. In July 1986 the first signup resulted in an enrollment of 753,632 acres. By the end of 1987, about 15.7

million acres had been enrolled in CRP. During this period ACR curtailed the consumption of commercial nitrogen

fertilizer more than CRP, particularly in 1986 and 1987. In 1986 about 46.1 million acres were idled through ACR,

and in 1987 about 60.5 million acres were idled.

NITROGEN, 1987-1992

An upward trend in the consumption of commercial nitrogen fertilizer is evident from 1987 through 1992. During

this period consumption increased from 10.2 million to 11.4 million nutrient tons, an increase of something less

than 12 percent. During this period the number of planted acres increased by 2.1 percent from 1987, to 302

million acres. At the same time, CRP enrollment increased to 35.4 million acres. State-specific data are presented

in appendix table 6 on page 46.

Figure 2. Nitrogen and

phosphate consumption, all

applications

Source of data: Vroomen

and Taylor, 1992;

USDA-NASS, March 1993

PHOSPHATE, 1982-1987

The trend for commercial

phosphate fertilizer

consumption during this period

closely parallels the trend for

nitrogen. An overall decrease

of 0.8 million nutrient tons

occurred between 1982 and

1987. The same drop is evident

for phosphate in 1983 that

occurred for nitrogen fertilizer consumption. The same factors that influenced the consumption of nitrogen are

likely involved in the consumption of phosphate fertilizers.

PHOSPHATE, 1987-1992

Commercial phosphate fertilizer consumption increased from 4.0 million nutrient tons to 4.2 million nutrient tons.

As is depicted in figure 2, the annual consumption of phosphate fertilizers during this period has been relatively

constant. State-specific data comparing the consumption of commercial phosphate fertilizers in 1982 and 1992

are presented in appendix table 7 on page 48.

Trends in Commercial Nitrogen and Phosphate Application Rates, 1982-1992 (Selected Crops)

Data to document long-term trends in the use of nitrogen and phosphate fertilizers were available for corn,

cotton, soybeans, and wheat. Annual application rates per acre are shown for the years 1982 through 1992 for

these crops. For rice, the same information was available and is shown only for the years 1988 through 1992.

CORN

Figure 3 shows trends in the use of nitrogen and phosphate fertilizers on corn for the period 1982-1992. It shows

an overall decline in the per acre application of commercial nitrogen fertilizer on corn, from 135 pounds per acre

in 1982 to 127 pounds per acre in 1992. The range in application rates for 1992 among the states for which

detailed data are collected was from a low of 78 pounds per acre in South Dakota to a high of 160 pounds per

acre in Texas. The reader is cautioned that this range reflects a difference in yield of forty-one bushels per acre

between these two states. Figure 3 shows, with the exception of minor spikes in 1985 and 1988, a continuous

decline in the per acre application of phosphate fertilizer on corn, which amounted to a decrease of 8 pounds per

acre during the period.

Figure 3. Nitrogen and

phosphate used on corn,

rate per fertilized acre

Source of data: Vroomen

and Taylor, 1992;

USDA-NASS, March 1993

WHEAT

Figure 4 shows trends in the

use of nitrogen and phosphate

fertilizers on wheat for the

period 1982-1992. Figure 4 is

inclusive of all wheat, including

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winter, durum, and other spring

wheats. It shows an overall

increase of 4 pounds of nitrogen

per acre during the period. Per

acre nitrogen fertilization rates vary among the three major wheat varieties. Data for nitrogen application rates of

selected states in 1992 are given below in table 3. Data for 1992 show a range of nitrogen fertilizer application

rates from a low of 43 pounds per acre in South Dakota to a high of 86 pounds per acre in Minnesota for spring

wheat, and from a low of 35 pounds per acre in Montana to a high of 101 pounds per acre in Arkansas. As with

corn, these differences reflect differences in both climate and yield.

Figure 4 also shows an overall decrease of 3 pounds per acre in phosphate fertilizer application rates on all wheat

during the 1982-1992 period. As with nitrogen, phosphate application rates vary among the three wheat

varieties. Data for phosphate application rates of selected states in 1992 are given in table 3.

Data for 1992 show ranges in phosphate fertilizer application rates from a low of 24 pounds per acre in South

Dakota and Montana to a high of 34 pounds per acre in Minnesota for spring wheat, and for winter wheat, from a

low of 16 pounds per acre in Colorado to a high of 63 pounds per acre in Ohio.

Figure 4. Nitrogen and

phosphate used on wheat,

rate per fertilized acre

Source of data: Vroomen

and Taylor, 1992;

USDA-NASS, March 1993

Table 3 Nitrogen and phosphate use on

wheat, 1992

Per acre application rate (lbs)

Variety Nitrogen Phosphate

Durum Wheat 51 26

Spring Wheat 57 29

Winter Wheat 66 8

SOYBEANS

Figure 5 shows trends in the use of nitrogen and phosphate fertilizers on soybeans for the 1982-1992 period. It

shows an increase of 14 pounds per acre in the use of nitrogen fertilizer on soybeans for the 1982-1992 period.

From 1982 to 1991 the extent of the soybean acreage receiving nitrogen fertilizer varied between 15 and 20

percent; it rose to 31 percent of the soybean acreage in 1992. Data for soybeans in 1992 show a range in

nitrogen fertilizer application rates from a low of 12 pounds per acre in Indiana to a high of 44 pounds per acre in

Kentucky. The percentage of soybean acreage receiving nitrogen fertilizer ranged from 4 percent in Louisiana to

54 percent in North Carolina.

Figure 5 also shows an increase of 5 pounds per acre in the use of phosphate fertilizers on soybeans during the

1982-1992 period. Data for 1992 show a range in the rates of phosphate fertilizer application from a low of 31

pounds per acre in Nebraska to a high of 74 pounds per acre in Kentucky.

Figure 5. Nitrogen and

phosphate used on

soybeans, rate per fertilized

acre

Source of data: Vroomen

and Taylor, 1992;

USDA-NASS, March 1993

COTTON

Figure 6 shows trends in the

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use of nitrogen and phosphate

fertilizers on cotton for the

1982-1992 period. From 1982 to

1988 nitrogen fertilization rates

varied from an average of 77

pounds per acre to 82 pounds

per acre. A sharp increase occurred after 1988, peaking at an average of 91 pounds per acre in 1991. Data for

1992 show a range in nitrogen fertilizer application rates from 66 pounds per acre in Texas to 131 pounds per

acre in California.

In general, per acre application rates of phosphate fertilizers on cotton decreased from 1982 to 1988 and

increased from 1988 to 1992. The net change from 1982 to 1992 was an increase of 2 pounds per acre. Data for

1992 show a range in phosphate fertilizer application rates from 44 pounds per acre in Arkansas, Louisiana, and

Texas to 86 pounds per acre in California.

Figure 6. Nitrogen and

phosphate used on cotton,

rate per fertilized acre

(average of selected states)

Source of data: Vroomen

and Taylor, 1992;

USDA-NASS, March 1993

RICE

Table 4 shows trends in the use

of nitrogen and phosphate

fertilizers on rice for the

1988-1992 period, during

which the per acre application

rate of nitrogen fertilizer on

rice rose to 134 pounds.

Phosphate fertilizer application

rates remained relatively constant, varying by 3 pounds per acre over the period.

Table 4 Nitrogen and phosphate used

on rice (selected states)

Application rate (lbs per acre)

Year Nitrogen Phosphate

1988 127 47

1989 125 45

1990 114 45

1991 127 46

1992 134 44

Source of data: USDA-ERS, 1993

OTHER CROPS

Detailed information on nitrogen and phosphate fertilizer utilization for the other crops considered in this RCA

analysis is collected by USDA-NASS and published in its Agricultural Chemical Usage Summary. Information is

collected and published for both field and vegetable crops. These publications were started in response to growing

public awareness of and interest in the interaction between agricultural chemical use in agricultural production

and water quality. The 1992 summary for field crops was the third such published by NASS, and the 1992

summary for vegetables was the second. The data published in these summaries do not yet represent a time

span long enough to establish or demonstrate long-term trends. Data on nitrogen and phosphate fertilizer

utilization for these crops for 1992 are reported in the status section of this report.

Trends in Animal Production, 1982-1992

Trends in animal production have followed the nation's move toward greater consumption of poultry and swine

and reduced consumption of cattle and calves. Table 5 shows the national trends in animal production for cattle

and calves, dairy cows and replacements, hogs and pigs, chickens (broilers), chickens (layers), and turkeys from

1982 through 1992. As the table indicates, the populations of beef cattle, dairy cattle, and chickens (layers)

decreased during this period, while the populations of chickens (broilers), turkeys, and hogs and pigs increased.

Table 5 Animal population summaries, 1982-1992

Animal type 1982 population

(1,000)

1992 population

(1,000) Percentage change

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Beef 100,061 85,445 -14.6

Dairy 15,544 14,115 -9.2

Hogs and pigs 54,534 58,001 +6.4

Chickens (layers) 379,219 367,015 -3.2

Chickens (broilers) 3,906,335 6,388,990 +63.6

Turkeys 163,809 288,980 +76.4

CATTLE AND CALVES

Nationally, the production of cattle and calves decreased by about 14 percent during the period cited. The

population of cattle and calves decreased in 48 of the 50 states. In those states, the reductive change ranged

from -4.3 percent in Colorado to -43.3 percent in New Hampshire. Increases in beef cattle populations occurred in

Kentucky and Rhode Island. State summaries for the 1982-1992 period are shown in appendix table 8 on page

50.

DAIRY COWS AND REPLACEMENTS

As with cattle and calves, the overall population of dairy cattle decreased nationally. In 1992 there were 9.2

percent fewer milk cows and replacement heifers than there were in 1982; decreases occurred in 41 states. The

decreases ranged from -4.1 percent in Missouri to -35.2 percent in Mississippi. Dairy cattle populations increased

in the other nine states. The reader is cautioned not to interpret the overall decrease in the population of dairy

cattle as a decrease in milk production. Milk production was not analyzed within the RCA process. State

summaries for the 1982-1992 period are shown in appendix table 9 on page 52.

HOGS AND PIGS

Nationally, the production of hogs and pigs increased about 6.4 percent during the 1982-1992 period. Of greater

interest is the ongoing regional shift in production. Hog production decreased in 31 states. Decreases ranged from

-3.2 percent to -98.9 percent. As hog production dropped in these states, it was increasing in the remaining 19

states; increases ranged from 3.4 percent to 109.3 percent. State summaries for the 1982-1992 period are

shown in appendix table 10 on page 54. Of interest are the state statistics, shown in table 6, documenting some

of the increases.

Table 6 Hog production (selected states)

State Change (percent) 1982-1992

Arkansas 65.3

California 56.3

Michigan 60.0

North Carolina 109.3

CHICKENS (LAYERS)

The population of chickens raised primarily for egg production remained relatively stable during the 1982-1992

period. In 1992, the population of all layers declined by 3.2% from 1982 population numbers. As with hogs and

pigs, there is evidence of regional shifts in the production of layers. While this type of chicken production was

decreasing by as much as 68.8 percent in Tennessee, it was increasing by 128.4 percent in Nebraska. State

summaries for the 1982-1992 period are shown in appendix table 11 on page 56.

CHICKENS (BROILERS)

During the 1982-92 period, there was a significant increase in the production of broiler chickens. Increases of

minor or major magnitude occurred in most of the states producing broilers in 1982. Broiler production in

Arkansas increased by 53 percent during the 1982-1992 period. The 1992 population for all broilers raised in

Arkansas was 1.02 billion birds. In those states for which production data was available, only Hawaii and Michigan

reported decreases in the 10-year period. State summaries for the 1982(92 period are shown in appendix table

12 on page 58.

TURKEYS

Production of turkeys increased by 76 percent during the 1982-1992 period. Increases occurred in all but three

states for which NASS collects data. These increases ranged from 3.4 percent in Massachusetts to 125.5 percent

in North Carolina. In North Carolina, the population increased from 27,500,000 turkeys in 1982 to 62,000,000 in

1992. Other states with significant percentage increases, although small numerical increases, included Illinois,

Oregon, and South Dakota. Turkey production decreased in Delaware and Maryland, Georgia, and New

Hampshire. State summaries for 1982-1992 are shown in appendix table 13 on page 60.

SUMMARY

From an environmental perspective, animal production is important because of its potential to contribute to

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environmental degradation. Degradation may occur as a direct result of animal activity, such as uncontrolled

grazing of riparian areas, or as a result of improper disposal of animal manures from feedlots and other confined

operations. Safe storage and effective utilization of the manures and nutrients produced by animal operations

offer a significant challenge to USDA, state environmental and conservation agencies, the animal industry, and

producers.

As public concern and care for water quality and other aspects of the environment continue to grow, it will

become increasingly important that animal production does not result in environmental degradation where that is

preventable. Land application of animal waste has historically been the vehicle for disposing of such material.

Historically, a given producer had adequate land to safely utilize animal waste. As the industry has moved toward

confinement-type facilities with greater total production, which are often concentrated in geographical areas, this

is no longer the case. In some situations, the production facility may own little, if any, land for agricultural

production. Even in those situations where the production facility does own such land, the land may not be

located close enough to the production site to make land disposition economical. Finally, in some locations, the

volume of nutrients produced as a function of animal production exceeds the crop requirements. In these areas,

other disposition techniques are required.

Status

Commercial Nitrogen and Phosphate Fertilizer Consumption, 1992

According to data collected and compiled by TVA's National Fertilizer and Environmental Research Center at

Muscle Shoals, Alabama, during the period from July 1, 1991, to June 30, 1992, commercial fertilizers that were

sold in the United States contained 11,446,415 tons of nitrogen and 4,217,866 tons of phosphate. In Appendix II,

table 14 (page 62) shows state-specific data on the consumption of nitrogen for the year 1992. Appendix table 15

(page 64) shows state-specific data for phosphate for the same period. The reader is cautioned that TVA data is

based on sales and therefore is not always indicative of actual use in the state.

Much, if not most, of the commercial fertilizer sold in the United States is used in agricultural production,

specifically to fertilize cropland and grazing land. In some states, agriculture accounts for much of the fertilizer

sold and applied to the land. In other states, other uses account for a significant amount of the fertilizer sold.

Although detailed information is presently collected regarding the fertilization of some agricultural crops, such

detailed information is not collected for all crops, nor is it collected for other agricultural and nonagricultural uses.

As a result, it is difficult to quantify such uses of commercial fertilizer.

Status of Commercial Nitrogen and Phosphate Utilization, 1992

(Total, Selected Crops, Other Uses)

Data collected by NASS in its Cropping Practices and Agricultural Chemical Usage surveys allows some

quantification of the use of commercial fertilizer in agriculture for selected crops. The data from the 1992 surveys

was used to estimate the amount of nitrogen and phosphate commercial fertilizer used in these selected

agricultural systems. Calculations for the total amount of commercial nitrogen and phosphate fertilizer were made

within states for which survey data is collected, using the formula below. Separate calculations were made for

each of the thirty-six survey crops.

Acres

Planted* x Area Applied

(Percent) x Rate Applied per

Crop Year = Total Quantity

Applied

State average values were used to make these computations. Planted acreage values were adjusted to reflect the

most recent estimates for planted acres.

In non-survey states where survey crops were grown in 1992, the amounts of commercial nitrogen and

phosphate fertilizer used to produce the crops were estimated using the formula. However, national average

values were used for area applied (percent) and rate applied per crop year. For each state, individual calculations

for each crop grown in that state were totaled to estimate the total amount of commercial nitrogen and

phosphate fertilizer used within the state on those selected crops in 1992.

These data were compared with TVA fertilizer sales data to estimate the amount of commer-cial nitrogen and

phosphate fertilizer used within the state for other agricultural and nonagricultural purposes. The reporting period

for the TVA data used in these calculations was July 1, 1991, to June 30, 1992. The reporting period for the

agricultural chemical usage survey data was the 1992 crop year. This disparity made an exact accounting of

commercial fertilizer use impossible. In 1992, approximately 68 percent of the commercial nitrogen fertilizer and

78 percent of the commercial phosphate fertilizer sold in the United States were used on the selected crops for

which NASS collects nutrient management information. State summaries of this information are shown in

Appendix II: table 14 (page 62) illustrates nitrogen use and table 15 (page 64) phosphate use.

Status of Animal Populations, 1992:

Manure, Nitrogen, and Phosphorus Production

National 1992 population information for beef and dairy cattle, hogs and pigs, chickens (broilers), chickens

(layers), and turkeys appears in table 5 on page 11 of this report. This population produced an estimated 869.4

million tons of manure, containing 2 million tons of organic nitrogen and 1.4 million tons of organic phosphorus,

some of which is recoverable and already used, or available for use, as a nutrient in agricultural production

systems.

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ESTIMATING ORGANIC NITROGEN AND PHOSPHORUS

In estimating the amount of organic nitrogen and phosphorus produced as a function of animal production,

several factors must be considered. These include:

Category 1 Losses--Losses of N and P that occur during collection, storage or treatment, handling, and land

application method. Not all of the N and P in freshly voided animal manure can be captured and used as a

resource. Losses vary depending upon the specifics of the agricultural waste management system.

Category 2 Losses--Manure produced in an environment where collection, storage or treat-ment, handling,

and land application are not possible. The manure produced by animals grazing on range or pasture is typically

available as a nutrient resource only on the land where it drops.

Van Dyne and Gilbertson (1978) included estimates of the amounts of manure and nutrients that are

economically recoverable. The estimates varied from 0, considering Category 1 losses for beef cattle grazing in

the southern states, to 100 percent, considering Category 1 losses for chickens (broilers and layers). The values

cited for nitrogen and phosphorus account for losses that occur during collection, storage or treatment, handling,

and application method. They do not account for the proportion of the total that cannot be captured and

managed. In some cases, the values used by Van Dyne and Gilbertson (1978) may not be accurate in 1994.

Changes in production techniques, particularly for hogs and pigs, may have changed these factors. The third RCA

appraisal process will attempt to update these factors and account for the losses in the final report.

The factors used to compute animal units (A.U.s), volume of manure generated, and amounts of nitrogen and

phosphorus produced with the manure are referenced and explained in Appendix I of this report.

CATTLE AND CALVES

There were 85,445,000 cattle and calves raised in the United States in 1992. This total includes beef cattle and

calves, and dairy calves. It does not include milking dairy cows or dairy replacement heifers. The volume of

manure produced by all cattle and calves in 1992 was an estimated 51 million tons. The amount of organic

nitrogen and phosphorus in this manure, accounting for Category 1 losses, was 0.88 million tons of nitrogen and

0.88 million tons of phosphorus. State-level data for manure, organic nitrogen, and organic phosphorus

production from cattle and calves are shown in appendix table 16 on page 66.

DAIRY COWS AND REPLACEMENTS

The population of dairy cows and replacement heifers was an estimated 14,115,000 animals in 1992. They

produced an estimated 243 million tons of manure. Within this manure was an estimated 1.6 million tons of

organic nitrogen and 0.15 million tons of organic phosphorus. These estimates included Category 1 losses.

State-level data for manure, organic nitrogen, and organic phosphorus production from dairy cows and

replacements are shown in appendix table 17 on page 68.

CHICKENS (LAYERS)

An estimated 367,015,000 layers were raised in 1992. They produced an estimated 17 million tons of manure. In

this manure was an estimated 0.12 million tons of organic nitrogen and 0.07 million tons of organic phosphorus.

The estimates for nitrogen and phosphorus include Category 1 losses. Category 2 losses are not normally

associated with the production of chickens. Most of the manure, nitrogen, and phosphorus produced in these

operations would be available as a resource. State-level data for manure, organic nitrogen, and organic

phosphorus production from non-broiler chickens are shown in appendix table 18 on page 70.

CHICKENS (BROILERS)

An estimated 6.4 billion broiler-type chickens were raised in 1992. They produced approxi-mately 36 million tons

of manure. Within this manure was an estimated 0.3 million tons of organic nitrogen and 0.13 million tons of

organic phosphorus. The estimates for nitrogen and phosphorus include Category 1 losses. As with layers,

Category 2 losses of nutrients are not normally associated with the production of broilers. State-level detail for

manure, organic nitrogen, and organic phosphorus production from broiler operations is shown in appendix table

19 on page 72.

HOGS AND PIGS (BREEDERS)

An estimated 7 million hogs and pigs were raised as breeders in 1992. They accounted for the production of

about 19 million tons of manure, which contained an estimated 0.034 million tons of organic nitrogen and 0.038

million tons of organic phosphorus. Nitrogen and phosphorus estimates take into account Category 1 losses but

not Category 2 losses. State-level detail for manure, organic nitrogen, and organic phosphorus production from

hogs and pigs is shown in appendix table 20 on page 74.

HOGS AND PIGS (MARKET)

An estimated 51 million hogs and pigs were raised for market in 1992. They accounted for the production of

about 39 million tons of manure, which contained an estimated 0.06 million tons of organic nitrogen and 0.08

million tons of organic phosphorus. Nitrogen and phosphorus estimates take into account Category 1 losses, but

not losses in Category 2. State-level detail for manure, organic nitrogen, and organic phosphorus production from

hogs and pigs is shown in appendix table 21 on page 76.

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TURKEYS

An estimated 289 million turkeys were raised in 1992. They produced approximately 14 million tons of manure

with about 0.12 million tons of organic nitrogen and 0.08 million tons of organic phosphorus. As with other

classes of animals, nutrient estimates were made accounting for Category 1 losses only. State-level data for

manure, organic nitrogen, and organic phosphorus production from turkeys appear in appendix table 22 on page

78.

SUMMARY

The manure and its content of organic nitrogen and phosphorus produced as a result of animal production

represent a valuable resource in agricultural production systems. According to information collected in the 1992

cropping practices survey, about 16.1 percent of the planted corn acres, 19.3 percent of the wheat acres, 5.9

percent of the soybean acres, 3.5 percent of the Irish potato acres, and 3.3 percent of the cotton acres received

applications of manure.

The 2 million tons of organic nitrogen and 1.4 million tons of organic phosphorus could satisfy a large amount of

the nutrient needs in some locations. Local organic sources of nitrogen and phosphorus are even known to exceed

the total needs of the crops grown in some areas. To investigate this situation, the Natural Resources

Conservation Service is cooperating with the Economic Research Service to complete a nationwide analysis of

confined animal feeding operations, the manure and nutrients produced at such facilities and available for use as

a nutrient source, and the ability of agriculture to assimilate the nutrients in an environmentally safe manner. The

1992 Census of Agriculture will be used as the source of crop and animal production data for this study, and the

report developed from the study will be issued as Section VII of the final RCA nutrient utilization report.

Status of Commercial Nitrogen and Phosphate Fertilizer Utilization

for 36 Selected Crops in 34 Selected States, 1992

Data compiled by NASS in its 1992 Agricultural Chemical Usage Summary for Vegetables and Field Crops was

used to assess the status of commercial nitrogen and phosphate fertilizer utilization during the 1992 crop year for

the 36 crops for which information was collected that year. Estimates of planted acres were adjusted from those

published in the summaries, based on more recent production estimates. Estimates of total commercial nitrogen

and phosphate fertilizer applications for the 36 crops were calculated using the procedure described elsewhere in

this report. No computations were made in states that were not part of the 1992 survey.

Approximately 229 million acres were planted to the 36 survey crops in 1992. According to the 1992 Census of

Agriculture, this is about 75 percent of the cropland planted that year. The NASS survey process captured

commercial nitrogen and phosphate fertilizer use information on about 204 million acres, about 89 percent of the

cropland acres planted to those crops in 1992.

For the 36 survey crops, appendix tables 23 and 24 show the following use data for nitrogen and phosphate

fertilizer for 1992:

Crop name

Acres planted (survey states only)

Total N and P2O5 applied (tons)

Percentage of the 1992 total consumption of N and 2O5 fertilizer

Average number of applications

Average per acre application rates (pounds per acre)

Range in per acre application rates (pounds per acre)

Range in application rates (pounds per unit of yield)

The calculation for percentage of the 1992 total nitrogen and phosphate fertilizer consumption was made by

comparing total survey application rates with TVA fertilizer sales information. This value shows the relative

importance among the crops as consumers of commercial nitrogen and phosphate fertilizers.

The range in nitrogen and phosphate fertilizer application rates as a function of crop yield unit was calculated to

show the variability in application rates associated with the use of nitrogen and phosphate fertilizers for producing

a given crop in different geographic areas. When compared with typical nitrogen and phosphorus crop uptake

information, the values give an indication of the amount of nitrogen and phosphorus not used by the plant and

therefore subject to becoming an environmental problem.

ASPARAGUS

The six survey states produced 86,310 acres of asparagus in 1992, accounting for about 97 percent of U.S.

commercial production for that year. Of that acreage, 64 percent received nitrogen fertilizer and 28 percent

received phosphate fertilizer. The average rate of nitrogen fertilizer application was 124 pounds per acre. Average

application rates by state ranged from 63 to 215 pounds per acre. Application rates as a function of yield unit

ranged from 3.3 pounds per cwt in Washington to 7.4 pounds per cwt in California.

The average rate of phosphate fertilizer application was 66 pounds per acre. Application rates of phosphate

fertilizer ranged from 37 to 139 pounds per acre. Application rates as a function of yield ranged from 1.9 pounds

per cwt in Washington to 6 pounds per cwt in New Jersey. Individual state data are presented in appendix table

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25 on page 84.

LIMA BEANS, FRESH

In 1992, Georgia was the single survey state for lima beans raised for the fresh market. Georgia raised 4,200

acres of lima beans that year. This was nearly all the production for fresh market consumption. One hundred

percent of the acreage received nitrogen fertilizer at an application rate of 98 pounds per acre. Ninety-nine

percent of the acreage received phosphate fertilizer at an application rate of 52 pounds per acre. The application

rate per yield unit was 2.8 pounds of nitrogen per cwt of yield and 1.5 pounds of phosphate per cwt. A summary

of Georgia's data is presented in appendix table 26 on page 84.

SNAP BEANS, FRESH

The seven survey states produced 71,600 acres of fresh market snap beans in 1992, accounting for about 79

percent of total production for that year. Of that acreage, 96 percent received nitrogen fertilizer and 90 percent

received phosphate fertilizer. The average rate of nitrogen fertilizer application was 82 pounds per acre.

Application rates by state ranged from 43 to 120 pounds per acre. Application rates based on unit of yield ranged

from a low of 1.2 pounds of nitrogen per cwt in Michigan to a high of 3 pounds per cwt in North Carolina. The

average rate of phosphate fertilizer application was 87 pounds per acre. Application rates as a function of yield

unit ranged from 1.2 pounds of phosphate per cwt of yield in California to New Jersey's 2.5 pounds of phosphate

per cwt. Data for the individual states are in appendix table 27 on page 85.

SNAP BEANS, PROCESSED

The ten survey states produced 158,530 acres of snap beans for processing in 1992, accounting for about 78

percent of total production in that year. Of that acreage, 98 percent received nitrogen fertilizer and 94 percent

received phosphate fertilizer. The average application rate of nitrogen fertilizer was 64 pounds per acre.

Application rates by state ranged from 35 to 136 pounds per acre. Application rates per unit of yield spread from

a low of 13 pounds per ton of yield in Michigan to a high of 19.7 pounds per ton in Wisconsin. The average rate of

phosphate fertilizer application was 64 pounds per acre. Application rates per unit of yield ranged from a low of

13.3 pounds of phosphate per ton of yield in Michigan to a high of 47 pounds per ton in Washington. Data for

individual states are given in appendix table 28 on page 86. Data for some states were suppressed for reasons of

confidentiality and therefore not considered in this analysis.

BROCCOLI

Four survey states produced 111,600 acres of broccoli in 1992 and accounted for almost all commercial broccoli

production in that year. Of that acreage, 97 percent received nitrogen fertilizer and 91 percent received

phosphate fertilizer. The average rate of nitrogen fertilizer application was 233 pounds per acre. Application rates

by state ranged from 149 to 275 pounds per acre. Application rates based on unit of yield ranged from 1.9

pounds of nitrogen per cwt of yield in Texas to 2.8 pounds per cwt in Arizona and Oregon, and from 0.8 pound of

phosphate per cwt in California to Arizona's 2.2 pounds of phosphate per cwt. Individual state data for broccoli

are found in appendix table 29 on page 87.

CABBAGE, FRESH

The nine survey states produced 70,000 acres of cabbage in 1992, which amounted to about 89 percent of total

commercial production during that year. Of this acreage, 98 percent received nitrogen fertilizer and 93 percent

phosphate fertilizer. The average rate of nitrogen fertilizer application was 155 pounds per acre. Average

application rates by state had a low of 88 pounds per acre and a high of 186 pounds per acre. Application rates

based on unit of yield ranged from 0.23 pound of nitrogen per cwt in Texas to 0.96 pound per cwt in New Jersey.

The average rate of phosphate fertilizer application was 111 pounds per acre. Application rates based on unit of

yield were 0.2 pound of phosphate per cwt to 0.8 pound of phosphate per cwt. Appendix table 30 (page 88)

shows data for the individual states.

CABBAGE, PROCESSED

Four survey states produced 5,300 acres of processed cabbage in 1992, accounting for about 84 percent of

commercial production during that year. All of that acreage received both nitrogen and phosphate fertilizers. The

average application rate of nitrogen fertilizer was 103 pounds per acre; the range was from 36 to 114 pounds per

acre. Application rates per unit of yield ranged from 2.9 pounds of nitrogen per ton of yield in Wisconsin to New

York's 4.1 pounds per ton. The average application rate of phosphate fertilizer was 83 pounds per acre.

Application rates per unit of yield were 2.2 pounds of phosphate per ton in Wisconsin and 3.2 pounds per ton in

New York. Data for individual states are displayed in appendix table 31 on page 89. Some of the state data were

suppressed and were not considered in this analysis.

CARROTS

The nine survey states produced 100,800 acres of carrots for all uses in 1992, which accounted for about 93

percent of total commercial production that year. Of this acreage, 96 percent received nitrogen fertilizer and 95

percent received phosphate fertilizer. The average nitrogen application rate was 234 pounds per acre. Application

rates had a low of 41 pounds per acre and a high of 276 pounds per acre. Application rates based on unit of yield

ranged from 0.13 pound of nitrogen per cwt in Wisconsin to 0.99 pound per cwt in Arizona. The average

application rate for phosphate fertilizer was 187 pounds per acre. Yield unit application rates ranged from 0.1

pound of phosphate per cwt in Washington to 0.7 pound of phosphate per cwt in California. Data for individual

states are shown in appendix table 32 on page 90.

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CAULIFLOWER

The six survey states produced 56,900 acres of cauliflower in 1992, accounting for nearly all commercial

production. Of this acreage, 96 percent received nitrogen fertilizer and 92 percent phosphate fertilizer. The

average application rate of nitrogen fertilizer was 260 pounds per acre. Average application rates by state ranged

from 80 to 283 pounds per acre. Application rates based on unit of yield ranged from 0.75 pound of nitrogen per

cwt in Michigan to Arizona's 2.57 pounds per cwt. The average application rate of phosphate fertilizer was 125

pounds per acre. Using yield units as a basis, application rates ranged from 0.6 pound of phosphate per cwt of

yield in New York to 2.2 pounds per cwt in Arizona. Data for individual states for cauliflower are presented in

appendix table 33 on page 91.

CELERY

The five survey states produced 33,920 acres of celery in 1992, about 99 percent of commercial production that

year. Of that acreage, 97 percent received nitrogen fertilizer and 95 percent received phosphate fertilizer. The

average nitrogen fertilizer application rate was 305 pounds per acre. Application rates ranged from 97 to 574

pounds per acre. Application rates per unit of yield ranged from 0.23 pound of nitrogen per cwt in Florida to 1.28

pounds per cwt in New York. The average application rate for phosphate fertilizer was 230 pounds per acre.

Application rates per unit of yield had a narrow range of 0.3 to 0.6 pound of phosphate per cwt of yield. Data for

individual states are presented in appendix table 34 on page 92. Some of the data for Texas were suppressed and

were not considered in this analysis.

FIELD CORN

The seventeen survey states produced 71,375,000 acres of field corn in 1992, accounting for about 90 percent of

total production during that year. Of that acreage, 97 percent received nitrogen fertilizer and 82 percent received

phosphate fertilizer. The average application rate of nitrogen fertilizer was 129 pounds per acre. Average rates by

state ranged from a low of 78 pounds per acre to a high of 160 pounds per acre. Application rates per unit of

yield ranged from a low of 0.7 pound of nitrogen per bushel of yield in Pennsylvania to South Carolina's high of

1.6 pounds per bushel. The average phosphate fertilizer application rate was 57 pounds per acre. The range of

application rates per yield unit was from 0.3 to 0.6 pound of phosphate per bushel of yield. Data for individual

states for field corn is illustrated in appendix table 35 on page 93.

SWEET CORN, FRESH

The eleven survey states produced 157,100 acres of sweet corn for fresh market in 1992, accounting for about 69

percent of total commercial production during that year. Of that acreage, 92 percent received nitrogen fertilizer

and 93 percent received phosphate fertilizer. The average rate of nitrogen fertilizer application was 119 pounds

per acre; average rates by state ranged from 67 pounds per acre to 180 pounds per acre. Application rates per

unit of yield ranged from 0.7 pound of nitrogen per cwt in Georgia to 1.6 pounds per cwt in New Jersey. The

average rate of phosphate fertilizer application was 88 pounds per acre. Application rates had a low of 0.7 pound

of phosphate per cwt of yield in Oregon to a high of 1.2 pounds of phosphate per cwt in New York. Appendix table

36 on page 94 has data for the individual states.

SWEET CORN, PROCESSED

The seven survey states produced 486,300 acres of processed sweet corn in 1992, accounting for about 91

percent of commercial production. Of that acreage, 99 percent received nitrogen fertilizer and 91 percent received

phosphate fertilizer. The average rate of nitrogen fertilizer application was 135 pounds per acre. Application rates

ranged from a low of 110 pounds per acre to a high of 180 pounds per acre. Application rates per unit of yield

ranged from 17.4 pounds per ton of yield in Minnesota to 27 pounds per ton in Washington. The average

application rate for phosphate fertilizer was 60 pounds per acre. Application rates based on unit of yield ranged

from 17.4 pounds of phosphate per ton in Minnesota to Washington's 27 pounds per ton. Data for individual

states are given in appendix table 37 on page 95.

UPLAND COTTON

The six survey states produced 10,065,000 acres of cotton in 1992. This was about 79 percent of total

commercial production for that year. None of the survey states were in the historic cotton-producing area of the

southeastern states, where cotton is again becoming an important crop. Of the 10+ million acres covered by the

1992 survey, 80 percent received nitrogen fertilizer and 48 percent received phosphate fertilizer. The average

application rate for nitrogen fertilizer was 88 pounds per acre. Application rates ranged from 66 pounds per acre

in Texas to 131 pounds per acre in California. Application rates per unit of yield ranged from 0.1 pound of

nitrogen per pound of yield in California to 0.15 pound of nitrogen per pound of yield in Mississippi and Texas. The

average application rate of phosphate fertilizer was 48 pounds per acre. Application rates had a range of 0.04

pound of phosphate per pound of yield in Arizona to 0.1 pound of phosphate per pound of yield in Texas. Data for

individual states are shown in appendix table 38 on page 96.

CUCUMBERS, FRESH

The ten survey states produced 45,600 acres of fresh market cucumbers in 1992, accounting for about 84

percent of commercial production. Nitrogen fertilizer was applied to 96 percent of the acreage, and phosphate

fertilizer was applied to 87 percent. The average nitrogen fertilizer application rate was 120 pounds per acre.

Nitrogen fertilizer application rates had a low of 51 pounds per acre and a high of 439 pounds per acre.

Application rates per unit of yield ranged from 0.5 pound of nitrogen per cwt in Texas to North Carolina's 3.4

pounds per cwt. The average application rate for phosphate fertilizer was 80 pounds per acre. Application rates

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based on yield unit show a low of 0.3 pound of phosphate per cwt and a high of 1.9 pounds per cwt in North

Carolina. Data for individual states are displayed in appendix table 39 on page 97. Some state data for this crop

were suppressed and not used in this analysis.

CUCUMBERS, PROCESSED

The eleven survey states produced 69,900 acres of processed cucumbers in 1992, which accounted for about 65

percent of commercial production. Of that acreage, 99 percent received nitrogen fertilizer and 87 percent received

phosphate fertilizer. Average application rate for nitrogen fertilizer was 86 pounds per acre, ranging from a low of

69 pounds per acre to a high of 185 pounds per acre. Application rates per unit of yield ranged from 11.5 pounds

of nitrogen per ton of yield in California to 22.2 pounds per ton in North Carolina. The average application rate for

phosphate fertilizer was 66 pounds per acre. Application rates per yield unit spread from 6.2 pounds of phosphate

per ton of yield in Wisconsin to 16.2 pounds per ton in Texas. Data for individual states are presented in appendix

table 40 on page 98.

EGGPLANT

Two survey states produced 3,700 acres of eggplant, accounting for nearly all commercial production in 1992. Of

this acreage, 99% received nitrogen fertilizer and 84% received phosphate fertilizer. The average application rate

for nitrogen fertilizer was 191 pounds per acre; it ranged from a low of 189 pounds per acre to a high of 198

pounds per acre. Fertilizer application rates per unit of yield were 0.7 pound of nitrogen per cwt of yield in Florida

and 1.1 pounds of nitrogen per cwt in New Jersey and 0.4 pound of phosphate per cwt in Florida and 0.7 pound of

phosphate per cwt in New Jersey. The average application rate for phosphate fertilizer was 124 pounds per acre.

Data for the two survey states are shown in appendix table 41 on page 99.

HEAD LETTUCE

The seven survey states produced 208,700 acres of head lettuce in 1992. This was about 96% of the commercial

production for that year. Of that acreage, 98 percent received nitrogen fertilizer and 85 percent received

phosphate fertilizer. The average nitrogen fertilizer application rate was 230 pounds per acre, ranging from 32 to

329 pounds per acre. Application rates per unit of yield ranged from 0.18 pound of nitrogen per cwt in Florida to

1.38 pounds per cwt in Arizona. The average application rate of phosphate fertilizer was 163 pounds per acre.

Yield unit application rates had a range of 0.2 pound of phosphate per cwt in Michigan to Texas' 0.7 pound per

cwt. Data for individual states for head lettuce are shown in appendix table 42 on page 99.

OTHER LETTUCE

The three survey states produced 57,700 acres of leaf, romaine, and other nonhead lettuce in 1992, accounting

for about 98 percent of the commercial production. Nitrogen fertilizer was used on 92 percent of the acreage, and

phosphate fertilizer was used on 88 percent. The average nitrogen fertilizer application rate was 186 pounds per

acre. The range spread from a low of 88 pounds per acre to a high of 390 pounds per acre. Application rates per

unit of yield ranged from 0.6 pound of nitrogen per cwt of yield in Florida to 1.7 pounds per cwt in Arizona. The

average application rate for phosphate fertilizer was 108 pounds per acre. Application rates per yield unit ranged

from 0.2 pound of phosphate per cwt in California to 0.6 pound per cwt in Arizona. Data for individual survey

states are found in appendix table 43 on page 100.

CANTALOUPE

The five survey states produced 103,200 acres of cantaloupe in 1992, accounting for about 93 percent of

commercial production for that year. Of that acreage, nitrogen fertilizer was used on 96 percent of the acreage;

phosphate fertilizer was used on 67 percent. The average nitrogen fertilizer application rate was 105 pounds per

acre. The lowest rate was 66 pounds per acre and the highest was 138 pounds per acre. Fertilizer application

rates per unit of yield ranged from 0.6 pound of nitrogen per cwt of yield in California to 1.15 pounds of nitrogen

per cwt in Georgia. The average application rate for phosphate fertilizer was 102 pounds per acre. Application

rates as a function of unit yield ranged from 0.5 pound of phosphate per cwt of yield in Texas to 1.2 pounds of

phosphate per cwt in Michigan. Data for individual survey states for cantaloupe are shown in appendix table 44 on

page 100.

HONEYDEW MELONS

The three survey states produced 25,600 acres of honeydew melons in 1992, nearly all the commercial

production. Nitrogen fertilizer was used on 96 percent of the acreage; phosphate fertilizer was used on 74

percent. The average nitrogen fertilizer application rate was 80 pounds per acre. It ranged from a low of 57

pounds per acre to a high of 146 pounds per acre. Application rates per unit of yield ranged from 0.3 pound of

nitrogen per cwt of yield in Texas to 1.0 pound of nitrogen per cwt in Arizona. The average rate of phosphate

fertilizer application was 61 pounds per acre. Unit of yield application rates were 0.3 pound of phosphate per cwt

of yield to 1.0 pound of phosphate per cwt. Appendix table 45 on page 101 presents information for the three

survey states.

WATERMELONS

The six survey states produced 178,500 acres of watermelons in 1992. This accounted for about 70 percent of

commercial production for that year. Nitrogen fertilizer was used on 94 percent of the acreage, and phosphate

fertilizer on 89 percent. The average rate of nitrogen fertilizer application was 126 pounds per acre, ranging from

65 to 270 pounds per acre. Application rates per unit of yield ranged from 0.5 pound of nitrogen per cwt in

California to 1.0 pound of nitrogen per cwt of yield in Arizona. The average application rate for phosphate

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fertilizer was 86 pounds per acre. Application rates based on unit of yield had a narrow range of 0.3 pound of

phosphate per cwt of yield to 0.6 pound of phosphate per cwt. Data for individual survey states for watermelons

are shown in appendix table 46 on page 101.

DRY ONIONS

The nine survey states produced 113,900 acres of dry onions in 1992, about 77 percent of commercial

production. Of that acreage, 98 percent received nitrogen fertilizer and 86 percent received phosphate fertilizer.

The average application rate for nitrogen fertilizer was 185 pounds per acre. It ranged from 92 to 305 pounds per

acre. Application rates per unit of yield ranged from 0.3 pound of nitrogen per cwt in Wisconsin to 0.99 pound of

nitrogen per cwt in Georgia. The average application rate for phosphate fertilizer was 129 pounds per acre.

Application rates as a function of yield unit ranged from 0.2 pound of phosphate per cwt of yield to 1.1 pounds of

phosphate per cwt. Data for individual survey states are given in appendix table 47 on page 102.

GREEN PEAS, PROCESSED

The nine survey states produced 329,400 acres of processed green peas in 1992, accounting for about 92 percent

of commercial production. Nitrogen fertilizer was used on 83 percent of the acreage and phosphate fertilizer on 69

percent. The average application rate for nitrogen fertilizer was 33 pounds per acre, with a spread of 26 to 101

pounds per acre. Application rates per unit of yield ranged from 14.1 pounds of nitrogen per ton of yield in

Minnesota to 27.1 pounds of nitrogen per ton in Oregon. The average rate of phosphate fertilizer application was

57 pounds per acre. Application rates per unit of yield had a low of 21.6 pounds of phosphate per ton of yield in

Minnesota and a high of 68.8 pounds of phosphate per ton in Oregon. Appendix table 48 (page 103) shows data

for individual survey states. Data for some of the survey states were suppressed and not considered in this

analysis.

BELL PEPPERS

The five survey states produced 61,500 acres of bell peppers in 1992, about 91 percent of commercial

production. Nitrogen fertilizer was used on 98 percent of the acreage; phosphate fertilizer was used on 87

percent. The average application rate for nitrogen fertilizer was 208 pounds per acre. It ranged from 81 to 254

pounds per acre. Application rates per unit of yield ranged from 0.34 pound of nitrogen per cwt of yield in Texas

to 1.96 pounds of nitrogen per cwt in New Jersey. The average application rate for phosphate fertilizer was 113

pounds per acre. Yield unit application rates spread from 0.4 pound of phosphate per cwt of yield to 2.9 pounds of

phosphate per cwt in North Carolina. Data for individual survey states for bell peppers are shown in appendix

table 49 on page 104.

IRISH POTATOES

The eleven survey states produced 1,104,300 acres of fall season potatoes in 1992. This accounted for about 96

percent of the commercial production during that year. Nitrogen fertilizer was used on 100 percent of the acreage

and phosphate fertilizer on 99 percent. The average application rate for nitrogen fertilizer was 200 pounds per

acre. It ranged from a low of 90 pounds per acre to a high of 308 pounds per acre. Application rates per unit of

yield ranged from 0.4 pound of nitrogen per cwt of yield in Oregon to 0.7 pound of nitrogen per cwt in Idaho. The

average application rate for phosphate fertilizer was 159 pounds per acre. Application rates based on yield units

had a narrow range of 0.3 pound of phosphate per cwt of yield to 0.7 pound of phosphate per cwt in New York.

Data for individual survey states are given in appendix table 50 on page 105.

RICE

The two rice survey states produced 1,879,000 acres in 1992, about 64 percent of commercial production.

Nitrogen fertilizer was used on 98 percent of the acreage; phosphate fertilizer was used on 34 percent. The

average application rate for nitrogen fertilizer was 133 pounds per acre. It averaged 111 pounds per acre in

Louisiana and 143 pounds per acre in Arkansas. Application rates per unit of yield were about 0.2 pound of

nitrogen per pound of yield in both states. Phosphate fertilizer application rates averaged 44 pounds per acre. The

application rate per yield unit was 0.01 pound of phosphate per pound of yield for both states. Data for the two

survey states are given in appendix table 51 on page 106.

SOYBEANS

The sixteen survey states produced 52,900,000 acres of soybeans in 1992, about 89 percent of commercial

production. Nitrogen fertilizer was used on 15 percent of the acreage and phosphate fertilizer being used on 22

percent. The average application rate for nitrogen fertilizer was 22 pounds per acre. Application rates had a low of

12 pounds per acre and a high of 44 pounds per acre. Fertilizer application rates per unit of yield ranged from 0.3

pound of nitrogen per bushel of yield in Indiana to 1.2 pounds of nitrogen per bushel in Kentucky. The average

application rate for phosphate fertilizer was 47 pounds per acre. Application rates per unit of yield had a low of

0.7 pound of phosphate per bushel of yield in Nebraska and a high of 1.9 pounds of phosphate per bushel in

Kentucky. Appendix table 52 on page 107 supplies data for individual survey states.

SPINACH, FRESH

The three survey states produced 13,200 acres of fresh market spinach in 1992, about 87 percent of commercial

production. Nitrogen fertilizer was used on 97 percent of the acreage and phosphate fertilizer on 80 percent.

Nitrogen fertilizer application rates averaged 113 pounds per acre. They ranged from a low of 79 pounds per acre

to a high of 152 pounds per acre. Application rates per unit of yield ranged from 0.58 pound of nitrogen per cwt

in California to 1.69 pounds of nitrogen per cwt in New Jersey. The average phosphate fertilizer application rate

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was 80 pounds per acre. The application rates based on unit of yield ranged from 0.4 pound of phosphate per cwt

in California to Texas' 1.4 pound of phosphate per cwt. Appendix table 53 on page 108 has data for the three

survey states for fresh market spinach.

SPINACH, PROCESSED

The four survey states produced 13,300 acres of processed spinach in 1992, representing 95 percent of

commercial production. Ninety-eight percent of the acreage received nitrogen fertilizer and 90 percent received

phosphate fertilizer. The average application rate of nitrogen fertilizer was 212 pounds per acre. It ranged from

173 to 231 pounds per acre. Application rates per unit of yield averaged 35.5 pounds of nitrogen per ton of yield

in California. Suppression of data in the other survey states prevented calculation of this value in those states.

The average application rate of phosphate fertilizer was 115 pounds per acre. Application rates for unit of yield

were 12.4 pounds of phosphate per ton in California and 25.4 pounds of phosphate per ton in Texas. Data for

individual survey states are shown in appendix table 54 on page 108. Data suppressed in several of the survey

states were not used in this analysis.

STRAWBERRIES

The nine survey states produced 46,800 acres of strawberries in 1992, accounting for 93 percent of commercial

production. Nitrogen fertilizer was used on 94 percent of the acreage; phosphate fertilizer was used on 84

percent. The average nitrogen fertilizer application rate was 189 pounds per acre, with a low of 32 pounds per

acre and a high of 280 pounds per acre. Application rates per unit of yield ranged from 0.45 pound of nitrogen

per cwt of yield in Florida to 2.84 pounds of nitrogen per cwt in New Jersey. The average application rate of

phosphate fertilizer was 85 pounds per acre. Unit of yield application rates spread from a low of 0.2 pound of

phosphate per cwt of yield to 2.2 pounds of phosphate per cwt in New Jersey. Data for the individual survey

states are presented in appendix table 55 on page 109.

TOMATOES, FRESH

The eight survey states produced 106,200 acres of fresh market tomatoes in 1992, about 78 percent of

commercial production. Nitrogen fertilizer was used on 99 percent of the acreage and phosphate fertilizer on 87

percent. The average application rate of nitrogen fertilizer was 167 pounds per acre. It spread from a low of 72 to

a high of 187 pounds per acre. Application rates per unit of yield ranged from 0.40 pound of nitrogen per cwt of

yield in Georgia to 4.56 pounds of nitrogen per cwt in Texas. The average application rate for phosphate fertilizer

was 113 pounds per acre. Application rates as a function of yield unit ranged from 0.3 pound of phosphate per

cwt to 3.6 pounds of phosphate per cwt. Data for the individual survey states for fresh market tomatoes are given

in appendix table 56 on page 110.

TOMATOES, PROCESSED

Five survey states produced 252,200 acres of processed tomatoes in 1992. This accounted for about 91 percent

of commercial production. Nitrogen fertilizer was used on 100 percent of the acreage and phosphate fertilizer on

92 percent. The average application rate of nitrogen fertilizer was 155 pounds per acre; it had a low of 66 pounds

per acre and a high of 157 pounds per acre. Application rates per unit of yield averaged 2.44 pounds of nitrogen

per ton of yield in Michigan and 4.75 pounds of nitrogen per ton in California. Suppression of data in other survey

states prevented calculation of this value in those states. The average application rate of phosphate fertilizer was

93 pounds per acre. Application rates for unit of yield were 2.8 pounds of phosphate per ton of yield in California

and 3.0 pounds of phosphate per ton of yield in Michigan. Data for individual survey states are in appendix table

57 on page 111.

DURUM WHEAT

North Dakota produced 2,200,000 acres of durum wheat in 1992, about 87 percent of total production. Nitrogen

fertilizer was used on 73 percent of the acreage at an average application rate of 51 pounds per acre. The

application rate per unit of yield was 1.3 pounds of nitrogen per bushel of yield. Phosphate fertilizer was used on

60 percent of the acreage at an average application rate of 26 pounds per acre. The unit of yield application rate

was 0.7 pound of phosphate per bushel of yield. Data for the survey state are presented in appendix table 58 on

page 112.

SPRING WHEAT

The four survey states produced 17,350,000 acres of spring wheat in 1992. This accounted for about 93 percent

of total production. Nitrogen fertilizer was used on 81 percent of the acreage, and phosphate fertilizer was used

on 72 percent. The average application rate of nitrogen fertilizer was 57 pounds per acre, and the range was from

28 to 86 pounds per acre. Application rates per unit of yield ranged from 0.9 pound of nitrogen per bushel of yield

in Montana to 1.7 pounds of nitrogen per bushel of yield in Minnesota. The average phosphate fertilizer

application rate was 29 pounds per acre. Application rates based on yield unit had a limited range of 0.7 pound to

0.8 pound of phosphate per bushel of yield. Data for individual survey states are displayed in appendix table 59

on page 112.

WINTER WHEAT

The fifteen survey states produced 44,410,000 acres of winter wheat in 1992, accounting for 87 percent of total

production. Nitrogen fertilizer was used on 85 percent of the acreage, and phosphate fertilizer was used on 48

percent. The average application rate for nitrogen fertilizer was 66 pounds per acre. It ranged from a low of 35 to

a high of 101 pounds per acre. Application rates per unit of yield ranged from 1.2 pounds of nitrogen per bushel

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of yield in Montana to 2.5 pounds of nitrogen per bushel in Oklahoma. The average application rate for phosphate

fertilizer was 38 pounds per acre. Unit of yield application rates spread from a low of 0.5 pound of phosphate per

bushel of yield to a high of 1.4 pounds of phosphate per bushel in Illinois. Appendix table 60 on page 113

presents data for the individual survey states.

SUMMARY

The thirty-six crops considered in this status and trends report accounted for slightly more than 204 million

cropland acres in 1992 in the thirty-four states surveyed by NASS. This is 89 percent of the total U.S. production

of these crops in that year. It is also 67.5 percent of the cropland acres planted in 1992. Approximately 7 million

tons of commercial nitrogen fertilizers were applied to these crops in 1992. This represents about 61 percent of

the 11.4 million tons of commercial nitrogen fertilizers sold in 1992.

Corn was the single largest consumer of commercial nitrogen fertilizers, receiving about 39 percent of the

fertilizer sold. Winter wheat was second, receiving about 11 percent of the amount sold; cotton and spring wheat

were third, each receiving slightly more than 3 percent of the total amount sold. Rice was the only other crop

receiving more than 1 percent of the total amount sold. All other crops in the survey received less than 1 percent

of the national volume of commercial nitrogen fertilizer sold in 1992.

Approximately 2.9 million tons of commercial phosphate fertilizers were applied to the survey crops, representing

68 percent of the commercial phosphate fertilizers sold in 1992. As with nitrogen, corn received the largest share

(39 percent) of phosphate fertilizers sold. Winter wheat was second, receiving about 9.6 percent of the amount

sold, and soybeans were third, receiving about 6.5 percent. Spring wheat, fall potatoes, and upland cotton were

the only other crops to receive more than 1 percent of the total amount sold. All other crops received less than 1

percent of total sales.

An important feature of phosphate fertilization was not considered in this analysis. That is the application of

phosphate fertilizers on soils where soil tests indicate a high or very high availa-bility of phosphate. The potential

for phosphate to become a pollutant may increase in such situations. Another factor that was not considered was

the use of organic sources of nutrients on the same acreages where commercial fertilizers were used; no data set

for this was available. Although it was not possible to quantify this situation, it is certain that some of the 3.8

million tons of organic nitrogen and 1.4 million tons of organic phosphorus produced as a function of the

agricultural animal industry were applied to cropland on acreage where commercial fertilizers were also used.

References

Barkema, Alan and Michael L. Cook. "The Changing U.S. Pork Industry: A Dilemma for Public Policy." Economic

Review. Second Quarter, 1993.

Berry, Janice T. and Melanie H. Montgomery. Commercial Fertilizers 1993. TVA-National Fertilizer and

Environmental Research Center. Muscle Shoals, Alabama. December 1993.

Donaldson, Regina. Fertilizer Trends. TVA-National Fertilizer and Environmental Research Center. Muscle Shoals,

Alabama. 1992.

USDA. Agricultural Statistics 1983. U.S. Government Printing Office, Washington, D.C. 1983.

USDA. Agricultural Statistics 1985. U.S. Government Printing Office, Washington, D.C. 1985.

USDA Agricultural Stabilization and Conservation Service. Historical Commodity Data Series, 1950-1985.

Washington, D.C. August 1989.

USDA Agricultural Stabilization and Conservation Service. Land Use Summary, Crop Years 1985-1993 with

Projections for 1994-1999. Washington, D.C. February 1994.

USDA Economic Research Service. Agricultural Resources: Inputs--Situation and Outlook Report AR-29.

Washington, D.C. February, 1993.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Agricultural Chemical Usage: 1992

Field Crops Summary. Washington, D.C. March 1993.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Agricultural Chemical Usage

Vegetables: 1992 Summary. Washington, D.C. June 1993.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Crop Production: 1993 Summary. Cr Pr

2-1(94). Washington, D.C. January 1994.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Cattle. Washington, D.C. February

1994.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Hogs and Pigs. Washington, D.C.

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December 1993.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Layers and Egg Production: 1993

Summary. Washington, D.C. January 1994.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Poultry: Production and Value: 1993

Summary. Washington, D.C. May 1994.

USDA National Agricultural Statistics Service, Agricultural Statistics Board. Vegetables: 1993 Summary, Reissued.

Vg 1-2(94). Washington, D.C. February 1994.

USDA Statistical Reporting Service, Crop Reporting Board. Cattle: Final Estimates for 1980-83. Statistical Bulletin

Number 720. Washington, D.C. January 1985.

USDA Statistical Reporting Service, Crop Reporting Board. Hogs and Pigs: Final Estimates for 1979-82. Statistical

Bulletin Number 716. Washington, D.C. March 1984.

USDA Statistical Reporting Service, Crop Reporting Board. Poultry: Production, Disposition, and Income: Final

Estimates for 1980-83. Statistical Bulletin Number 725. Washington, D.C. April 1985.

U.S. Department of Commerce, Bureau of the Census. 1987 Census of Agriculture. Volume 1, Parts 1-51. U.S.

Government Printing Office, Washington, D.C. June 1990.

U.S. Department of Commerce, Bureau of the Census, Economics and Statistics Administration. 1992 Census of

Agriculture. Volume 1, Parts 1-51. U.S. Government Printing Office, Washington, D.C. October 1994.

Van Dyne, Donald L. and Conrad B. Gilbertson. Estimating U.S. Livestock and Poultry Manure and Nutrient

Production. USDA Economics, Statistics, and Cooperative Service. Washington, D.C. 1978.

Vroomen, Harry and Harold Taylor. Fertilizer Use and Price Statistics, 1960-91. Statistical Bulletin Number 842.

USDA Economic Research Service. November 1992.

Appendix 1

Computational factors and methods for calculating animal units, volume of manure produced yearly,

and amounts of nitrogen and phosphorus produced with the manure.

Animal category Number of animals per A.U.

(animal unit)

Manure

Tons per A.U.

Pounds per ton

N P

Cattle and calves

Beef* 1.67 9.8 11.6

(3.5)

4.1

(3.5)

Dairy** 0.87 15.0 10.2

(4.1)

1.4

(1.2)

Hogs and pigs

Breeding 2.5 6.6 15

(3.7)

4.8

(4.1)

Market 7.7 12.96 13.2

(3.2)

5.0

(4.2)

Poultry

Chickens (layers) 240 11.0 27.4

(13.7)

10.2

(8.7)

Chickens (broilers) 450 14.6 27.5

(16.5)

8.5

(7.2)

Turkeys 83 8.0 33.8

(16.9)

12.7

(10.8)

*Beef numbers comprise beef cows that have calved + [heifers (all) - heifers (milk replacement)] + steers + bulls

+ (all calves times the proportion equal to beef cows that calved divided by all cows that calved). This includes

bulls and "other" heifers as beef, but shouldn't be far off.

**Dairy numbers comprise milk cows that have calved + heifers (milk replacement) + (all calves times the

proportion equal to milk cows that calved divided by all cows that calved).

The numbers for nitrogen and phosphorus include two sets of values. The first set are estimates of nitrogen and

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phosphorus in the manure as excreted by the animal. They represent the content in each ton of manure produced

by each animal unit (A.U.). The second set of values, inside the parentheses ( ), take into account nutrient losses

that occur due to storage and handling. They represent the nitrogen and phosphorus content in each ton of

manure produced by each A.U. when the manure is applied to land. These values do not take into account losses

that may occur after application. Estimates of the quantities of nitrogen and phosphorus were made using the

values in the parentheses.

BEEF NUMBERS

Assumed average weight of 600 pounds. Values for "as excreted" manure from Table 4-8, NRCS Agricultural

Waste Management Field Handbook (AWMFH) - Manure weight 54 lb/day 1000#, N - 0.31 lb/day/1000#, P - 0.11

lb/day/1000#, K - 0.25 lb/day/1000#. Losses of N at 70% based on an integration of 30-60% losses on open lots

(tending to 60% losses from voided wastes on pasture and range). Table 11-5 AWMFH is referenced here and in

the rest of the discussion for other animal types. Losses of P at 15% because element is conservative,

experiencing losses primarily in runoff of manure pack and piles. Losses of potassium (K) at 10%, because much

potassium in liquid that can infiltrate into surface layer and not be as subject to runoff.

The inventory numbers for cattle and calves listed in appendix table 16 (page 66) were considered to be in place

for the entire year. Manure calculations were made based upon this assumption.

DAIRY NUMBERS

Assumed average weight 1150 pounds which accounts for younger stock other than lactating animals. Values for

"as excreted" manure from Table 4-5, AWMFH - Manure weight 82 lb/day/1000#, N - 0.42 lb/day/1000#, P -

0.06 lb/day/1000#, K - 0.25 lb/day/1000#. Losses of nitrogen at 60% based on an integration of 30-60% losses

on open lots (tending to 60% losses in majority of country); 70-80% losses in long-term storage (greater than 90

days), treatment lagoons, and pasture situations; and lesser losses in closed storages. Losses of phosphorus at

15% because element is conservative, experiencing losses primarily in runoff of manure pack and piles. Losses of

potassium (K) at 10%, because much K in liquid that can infiltrate into surface layer and not be as subject to

runoff.

The inventory numbers for dairy cows and replacements listed in appendix table 17 (page 68) were considered to

be in place for the entire year. Manure calculations were made based upon this assumption.

CHICKENS (LAYERS)

Assumed average weight 4.2 pounds. Values for as excreted manure from Table 4-14, AWMFH - Manure weight

60 lb/day/1000#, N - 0.83 lb/day/1000#, P - 0.31 lb/day per 1000#, K - 0.34 lb/day/1000#. Losses of nitrogen

at 50% based on an integration of 60-70% losses in long-term storage and treatment lagoons and 30-40% losses

as litter. Losses of phosphorus at 15% because element is conservative. Losses of potassium at 10%.

The inventory numbers for chickens (non-broilers) listed in appendix table 18 (page 70) were considered to be in

place for the entire year. Manure calculations were made based upon this assumption.

CHICKENS (BROILERS)

Assumed average weight 2.2 pounds. Values for as excreted manure from Table 4-14, AWMFH - Manure weight

80 lb/day/1000#, N - 1.05 lb/day/1000#, P - 0.34 lb/day per 1000#, K - 0.46 lb/day/1000#. Losses of nitrogen

at 40% based on losses in the house computed from Tables 4-14 and 4-15. Losses of phosphorus at 15%

because element is conservative. Losses of potassium at 10%.

A production cycle of 63 days per flock was used for estimating manure production and quantities of nitrogen and

phosphorus for broilers. The values for total A.U.s listed for broiler chickens in appendix table 19 (page 72) were

divided by a factor of 5.7 for making the manure, nitrogen, and phosphorus estimates.

HOGS AND PIGS

Breeding sows and market pigs were analyzed separately. Assumed average weight for sows was 400 pounds.

Assumed median weight for market pigs 130 pounds. Values for as excreted manure calculated from Table 4-11,

AWMFH, Swine Waste Characterization. Manure and nutrient contents were calculated considering both the

gestation and lactation periods for sows and the nursery and grower period for market pigs. Values used for

manure production for sows were 27.2 lb/day/1000# (gestation) and 60 lb/day/1000# (lactation). N production

was 0.19 lb/day/1000# (gestation) and 0.47 lb/day/1000# (lactation). P production was 0.063 lb/day/1000#

(gestation) and 0.15 lb/day/1000# (lactation). The inventory numbers for breeding swine listed in appendix table

20 (page 74) were considered to be in place for the entire year. Manure and nutrient value calculations were

made based upon this assumption.

A production cycle of 154 days per litter with 2.2 cycles per year was assumed for market pigs. Values for

manure production were 106 lbs/day/1000# (nursery) and 63.4 lbs/day/1000# (grower). N production was 0.60

lbs/day/1000# (nursery) and 0.42 lbs/day/1000# (grower). P production was 0.25 lbs/day/1000# (nursery) and

0.16 lbs/day/1000# (grower). Production values from appendix table 21 (page 76) were divided by 2.2. Manure

and nutrient calculations were made based upon these assumptions.

Nutrient losses for nitrogen were estimated to be 75% based upon an integration of 30-60% losses on open lots

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(tending to 60% losses in majority of country) and near 80% losses from voided wastes in treatment lagoons,

which are the most common storage/treatment option. Losses of phosphorus were estimated at 15%. Most

phosphorus losses are in manures that are unaccounted for or are in sludges.

TURKEYS

Assumed average weight 12 pounds. Values for as excreted manure from Table 4-14, AWMFH - Manure weight 44

lb/day/1000#, N - 0.74 lb/day/1000#, P - 0.28 lb/day/1000#, K - 0.28 lb/day/1000#. Losses of nitrogen at 50%

based on an integration of 30-60% losses on open lots (tending to 60% losses in majority of country) and 40%

losses from voided waste in houses. Losses of phosphorus at 15% because element is conservative. Losses of

potassium at 10%.

A production cycle of 140 days per flock was used for estimating manure production and quantities of nitrogen

and phosphorus for turkeys. The values for total A.U.s for turkeys listed in appendix table 22 (page 78) were

divided by a factor of 2.6 for making the manure, nitrogen, and phosphorus estimates.

Tables

There are 60 tables associated with this document. These tables are available in hard copy only.

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