Operation Effects (cont)
ØDisturb surface
-For mechanical soil disturbance that loosens soil
-Tillage type (inversion, mixing+some inversion, mixing only, lifting fracturing, compression) determines where residue is placed in soil and how residue and roots are redistributed within soil
-Buries and resurfaces residue based on ratios that depend on residue type
-Tillage intensity (degree that existing roughness is obliterated)
-Recommended, minimum, maximum depths
-Initial ridge height
-Initial, final roughness (for the base condition)
-Fraction surface area disturbed (tilled strips)
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Critical effect for representing tillage and other soil disturbing operations.
Burial and resurfacing ratio values function of implement and type of residue.
These ratios based on mass.
Tillage intensity represents how much of the existing roughness at time of disturbance influences roughness after the disturbance.  A harrow does not eliminate all existing roughness (tillage intensity= 0.4).  The roughness left by a moldboard plow is independent of preexisting roughness (tillage intensity = 1.0).
Follow core database.