WISCONSIN KEY TO LAND CAPABILITY UNITS

(Reference is NSSH 622.02)

-   *CLASS I SOILS: DEEP AND VERY DEEP, WELL DRAINED AND MODERATELY WELL
    DRAINED SOILS, \>5" AWC, RV SLOPE IS \<2 PERCENT, FLOODING FREQUENCY
    IS RARE, VERY RARE, OR NONE IN ALL MONTHS (do not include bouldery,
    stony, or cobbly surface phases)*

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-   VERY DEEP LOAMY AND SILTY SOILS

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-   LOAMY AND SILTY SOILS \>40" OVER CLAY, LOAMY SKELETAL, BEDROCK,
    SAND, OR SAND AND GRAVEL

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-   *CLASS IIs SOILS: MODERATELY DEEP TO VERY DEEP, WELL DRAINED AND
    MODERATELY WELL DRAINED SOILS, \>5.5" AWC, RV SLOPE IS \<2 PERCENT,
    FLOODING FREQUENCY IS RARE, VERY RARE, OR NONE IN ALL MONTHS, (do
    not include bouldery, stony, or cobbly surface phases)*

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-   LOAMY AND SILTY SOILS 20-40" OVER CLAY, LOAMY SKELETAL, BEDROCK,
    SAND, OR SAND AND GRAVEL

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-   *CLASS IIe SOILS: MODERATELY DEEP TO VERY DEEP, WELL DRAINED AND
    MODERATELY WELL DRAINED SOILS, RV pH is \>5.0 in all layers within
    40", \>5.5" AWC, RV SLOPE IS 2 TO 6 PERCENT, FLOODING FREQUENCY IS
    RARE, VERY RARE, OR NONE IN ALL MONTHS, (do not include bouldery,
    stony, or cobbly surface phases)*

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-   VERY DEEP LOAMY AND SILTY SOILS

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-   LOAMY AND SILTY SOILS 20-40" OVER CLAY, LOAMY SKELETAL, BEDROCK,
    SAND, OR SAND AND GRAVEL

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-   *CLASS IIw SOILS: RV pH is \>5.0 in all layers within 40", \>5.5"
    AWC, RV SLOPE IS \<2 PERCENT (do not include bouldery, stony, or
    cobbly surface phases)*

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-   SOMEWHAT POORLY DRAINED SOILS; FLOODING FREQUENCY IS RARE, VERY
    RARE, OR NONE IN ALL MONTHS

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-   SOMEWHAT POORLY DRAINED TO WELL DRAINED SOILS, FLOODING FREQUENCY IS
    OCCASIONAL, FREQUENT, OR VERY FREQUENT IN AT LEAST ONE MONTH
    (FLOODING IS NOT DURING THE GROWING SEASON, OR THE SOIL CAN BE
    ECONOMICALLY AND ADEQUATELY PROTECTED FROM FLOODING)

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-   *CLASS IIIe SOILS: RV SLOPE IS 7-12 PERCENT (do not include
    bouldery, stony, or cobbly surface phases)*

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-   VERY DEEP, MODERATELY WELL DRAINED TO SOMEWHAT EXCESSIVELY DRAINED
    SOILS, \>4.4" AWC

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-   MODERATELY DEEP AND DEEP, MODERATELY WELL DRAINED TO SOMEWHAT
    EXCESSIVELY DRAINED SOILS, \>3.1\" AWC

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-   *CLASS IIIs SOILS: RV SLOPE IS 6 PERCENT OR LESS, FLOODING FREQUENCY
    IS RARE, VERY RARE, OR NONE IN ALL MONTHS (do not include bouldery,
    stony, or cobbly surface phases)*

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-   DEEP AND VERY DEEP, MODERATELY WELL DRAINED TO SOMEWHAT EXCESSIVELY
    DRAINED SOILS WITH \>3.4-5.5" AWC

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-   MODERATELY DEEP, MODERATELY WELL DRAINED TO SOMEWHAT EXCESSIVELY
    DRAINED SOILS WITH \>3.1-5.5" AWC

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-   SHALLOW/ WELL DRAINED SOILS WITH \>2" AWC

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-   *CLASS IIIw SOILS: RV SLOPE IS \<2 PERCENT (do not include bouldery,
    stony, or cobbly surface phases)*

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-   SOMEWHAT POORLY DRAINED SOILS WITH \>4.0" AWC, FLOODING FREQUENCY IS
    RARE, VERY RARE, OR NONE IN ALL MONTHS

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-   SOMEWHAT POORLY DRAINED TO WELL DRAINED SOILS, \>4.4" AWC, FLOODING
    FREQUENCY IS OCCASIONAL, FREQUENT, OR VERY FREQUENT IN AT LEAST ONE
    MONTH

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-   *CLASS IVe SOILS: RV SLOPE IS 20 PERCENT OR LESS (do not include
    bouldery, stony, or cobbly surface phases)*

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-   \>4.4" AWC, **RV SLOPE IS 13-20 PERCENT**

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-   DEEP AND VERY DEEP, MODERATELY WELL DRAINED TO SOMEWHAT EXCESSIVELY
    DRAINED SOILS WITH LOAMY SUBSOILS AND \>3.4" AWC, **RV SLOPE IS 7-12
    PERCENT**

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-   MODERATELY DEEP AND DEEP/ MODERATELY WELL DRAINED TO SOMEWHAT
    EXCESSIVELY DRAINED SOILS, \>3.1" AWC, WHERE THE RV SLOPE IS 13-20
    PERCENT

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-   SHALLOW, WELL DRAINED SOILS, \>2" AWC, **RV SLOPE IS 7-12 PERCENT**

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-   *CLASS IVs SOILS: RV SLOPE IS 12 PERCENT OR LESS; MODERATELY WELL
    DRAINED TO EXCESSIVELY DRAINED SOILS, FLOODING FREQUENCY IS RARE,
    VERY RARE, OR NONE IN ALL MONTHS (NEEDS REVISION)*

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-   SOILS WITH BOULDERY, STONY, OR COBBLY SURFACE PHASES WHERE THE
    REMOVAL OF THESE ROCK FRAGMENTS IS FEASIBLE, RV SLOPE IS \<12
    PERCENT

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-   RV SLOPE IS 6 PERCENT OR LESS

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-   DEEP AND VERY DEEP, **SOMEWHAT POORLY DRAINED** (CHANGE BACK TO
    MWD??) TO SOMEWHAT EXCESSIVELY DRAINED SOILS WITH SANDY SUBSOILS,
    \>3.4" AWC, **RV SLOPE IS 7-12 PERCENT**

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-   *CLASS IVw SOILS: SOILS WHERE THE RV SLOPE IS 2 PERCENT OR LESS AND
    SURFACE TEXTURE PHASES ARE NON-STONY AND NON-COBBLY*

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-   SOMEWHAT POORLY DRAINED SOILS, FLOODING FREQUENCY IS RARE, VERY
    RARE, OR NONE IN ALL MONTHS

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-   SOMEWHAT POORLY DRAINED TO WELL DRAINED SOILS, FLOODING FREQUENCY IS
    OCCASIONAL, FREQUENT, OR VERY FREQUENT IN AT LEAST ONE MONTH

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-   *CLASS VIe SOILS: SOILS WITH NON-STONY AND NON-COBBLY SURFACE
    PHASES*

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-   VERY DEEP SOILS, \>4.4" AWC, **RV SLOPE IS 21-30 PERCENT**

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-   MODERATELY DEEP AND DEEP, MODERATELY WELL DRAINED TO SOMEWHAT
    EXCESSIVELY DRAINED SOILS, \>3.1" AWC,

**RV SLOPE IS 21-30 PERCENT**

-   SHALLOW, WELL DRAINED SOILS, \>2" AWC, **RV SLOPE IS 13-20 PERCENT**

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-   *CLASS VIs SOILS: WELL DRAINED TO EXCESSIVELY WELL DRAINED SOILS*

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-   SOIL WITH BOULDERY, STONY, OR COBBLY SURFACE PHASES WHERE THE
    REMOVAL OF ROCK FRAGMENTS IS NOT FEASIBLE, RV SLOPE IS 12-30 PERCENT

-   SOILS WHERE THE RV SLOPE IS 7-15 PERCENT

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-   DEEP AND VERY DEEP, MODERATELY WELL DRAINED TO SOMEWHAT EXCESSIVELY
    WELL DRAINED SOILS, SANDY SUBSOILS, \>3.4" AWC, **RV SLOPE IS 13-20
    PERCENT**

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-   *CLASS VIw SOILS: VERY POORLY DRAINED AND POORLY DRAINED SOILS,
    FLOODING FREQUENCY IS OCCASIONAL, RARE, VERY RARE, OR NONE IN ALL
    MONTHS **AND LANDFORM POSITIONS ALLOW SUITABLE OUTLETS FOR
    ARTIFICIAL DRAINAGE***

**[DRAINED PHASES OF VIw:]{.underline}**

Use CLASS 3w for all HISTOSOLS

Use CLASS 2w for \>5.5 AWC

Use CLASS 3w for 3.4"-5.5\" AWC

Use CLASS 4w for sandy soils \<3.4\"AWC

# *CLASS VIIe: RV SLOPE IS \>20 PERCENT*

-   \>4.4" AWC, **RV SLOPE IS \>30 PERCENT**

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-   WELL DRAINED TO SOMEWHAT EXCESSIVELY DRAINED SOILS, \>3.4" AWC, **RV
    SLOPE IS 21-30 PERCENT**

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-   SHALLOW, WELL DRAINED SOILS, \>2" AWC, **RV SLOPE IS 21-30 PERCENT**

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-   *CLASS VIIs SOILS: WELL DRAINED TO EXCESSIVELY WELL DRAINED SOILS,
    RV SLOPE IS \>15 PERCENT SLOPES*

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-   *CLASS VIIw SOILS: FLOODING FREQUENCY IS FREQUENT OR VERY FREQUENT
    IN AT LEAST ONE MONTH **OR LANDFORM POSITIONS PRECLUDE SUITABLE
    OUTLETS FOR ARTIFICIAL DRAINAGE***

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-   SOMEWHAT POORLY TO VERY POORLY DRAINED SOILS

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-   *CLASS VIII SOILS:*

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-   ROCK OUTCROPS, SANDY BEACHES, RIVERWASH, GRAVEL PITS, QUARRIES, AND
    OTHER BARREN LANDS ARE INCLUDED IN CLASS VIII. (from AG handbook
    #210)

**General Instructions:**

1.  It is best to have most of your NASIS DMU data checked and edited
    before you check the LCC, however, you can also use this procedure
    as a check of data elements.

2.  This key uses the following NASIS data elements....

depth

drainage

RV slope gradients

surface texture modifiers

horizon textures

available water capacity

and frequency of flooding

> It is much more convenient if you can export these data elements into
> a spreadsheet before you begin to key your LCCs.

3.  Match the soil to the MAIN CLASS HEADING; continue to the ARROWED
    SUBHEADINGS (if present). The soil must match the MAIN CLASS HEADING
    and one of the ARROWED SUBHEADINGS (if present) to be designated
    that class. If not a match, continue to the next MAIN CLASS HEADING.

Rules of Thumb:

1.  Use the RV AWC to 40" (there is a report to calculate this for you).

2.  To determine AWC for paralithic and lithic soils; use the RV depth
    to restriction.

3.  Depth (i.e. deep, moderately deep, etc.) refers to depth to
    restriction unless otherwise specified.

4.  Class V is not accounted for in this key. When parameters are
    established which allow this class tp be uniquely identifiable it
    can be added. As of 12/2002 it is not being used.

5.  For soils with a restriction occurring within 40\" (generally
    20-40\"), the AWC report will use the RV depth (i.e. not necessarily
    30\") to restriction.