Soil Land Class IIV Cropland Can grow crops

Land Class I-IV Cropland – Can grow crops on these n V – Do

This chart is a starting point for all land classes. Soil can be no

Land Class Continued Determine initial land class from previous chart n If Surface Soil

Land Class Cont’d If depth to rocks is less than 10” deep and less

Land Class Cont’d n Rock Fragments – None or Few = No Bump –

Land Class Cont’d n Looking at Drainage – Excessively Drained – At least Class

Land Class Cont’d n Looking at site on landscape – If it will flood

Estimating Crop Yield Low Medium High Corn Low AWHC, or Medium AWHC on 8

Limitations n n Check limitations if there is a problem When to check… –

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Soil

Land Class I-IV Cropland – Can grow crops on these n V – Do not check when judging n VI – Pasture n VII – Rocks and Non Fruit Production Trees n VIII – Do not check when judging n

This chart is a starting point for all land classes. Soil can be no better than this chart…can worsen due to texture, depth, or drainage. Erosion 0 -2% 2 -5% 5 -12% 12 -20% 20 -30% Greater than 1 ¾ I II IV VI VII Less than 1 3/4 II IV VI VI VII

Land Class Continued Determine initial land class from previous chart n If Surface Soil and Subsoil are both coarse texture bump one class n If depth to rocks is n – > 36” deep do not bump – 20 -36” Bump one land class – 10 -20” Bump two land classes

Land Class Cont’d If depth to rocks is less than 10” deep and less than 12% slope it will be at least a Class VI n If greater than a 12% slope it will be at least a Class VII n If depth to clay or fragipan is less than 24”, Bump one land class. If it is deeper than 24” do not bump. n

Land Class Cont’d n Rock Fragments – None or Few = No Bump – Common = No Bump – Many = Bump one land class n Rock Outcrop – None or Few = No Bump – Common = At least a Class III – Many = At least a Class VII

Land Class Cont’d n Looking at Drainage – Excessively Drained – At least Class II – Well Drained – At least Class I – Moderately Well Drained – At least Class II – Somewhat Poorly Drained – At least Class III – Poorly Drained – At least Class IV

Land Class Cont’d n Looking at site on landscape – If it will flood then it is at least a class II

Estimating Crop Yield Low Medium High Corn Low AWHC, or Medium AWHC on 8 -12% Slope All Other High AWHC on 0 -5% Slope, Except Poorly Drained Cotton Low AWHC, or Poorly Drained Soil in Floodplains or Depressions All Other High AWHC on 0 -5% Slope, Except Poorly Drained Soybean Low AWHC All Other High AWHC on 0 -8% Slopes Tobacco Low AWHC, or Medium AWHC on 812% Slope, and on Poorly Drained and Somewhat Poorly Drained Soil All Other High AWHC on 0 -5% Slopes that are well drained and do not flood Small Grain Low AWHC on slopes greater than All Other 5%, or very shallow rooting depth, or PD/SWP drained soils that flood Soils that do not flood that are Well Drained or MWD that have High AWHC on 0 -8% Slopes or Medium AWHC on 0 -5% Slopes Alfalfa Low AWHC, or PD/SWP drained soils (they do not have to flood) or MWD soils that flood! All Other High AWHC on 0 -8% Slopes that are well drained and do not flood (Must have all) Fescue/White Clover Low AWHC with slopes greater than 12%, and on soils with very shallow rooting depth All Other High AWHC (Slope doesn’t matter) or Medium AWHC on 0 -8% Slopes

Limitations n n Check limitations if there is a problem When to check… – Wetness is MWD, SWP, or PD – Slope is greater than 2% – Texture of surface soil is coarse or fine – Texture of subsoil is coarse – AWHC is less than 6 – RF or RO is common or many – Effective Depth is less than 30 inches deep for any reason – Flooding – if it will flood (depression or floodplain)