REVISED UNIVERSAL SOIL LOSS EQUATION

Residue

ØSize, toughness

-5 types: small, fragile (soybeans); moderate size, moderately fragile (wheat); large size, nonfragile (corn); large size, tough (woody debris); gravel, small stones

ØDecomposition (coefficient, halflife)

ØMass-cover values

ØSource: NRCS databases

ØName and save

Mass per unit area

Enter 1 of 3 pts.

Mass @ 30, 60, or 90% cover

30%

60%

90%

% Cover


	Several variables are used to describe residue.
	Size and toughness, replaces the fragile, non-fragile concept.
	5 types defined.
	Decomposition is a function of distribution of stems, leaves, pods, roots, etc. but a single value is used.
	Also a single value is used for above ground and below ground decomposition.
	Mass-cover relationship. Enter a data point on curve. RUSLE2 self-calibrates.
	Stay with core values in core databases. Interaction of mass-cover, residue at harvest and decomposition. Change of one requires recalibration of RUSLE2.
	RUSLE2 captures main effects.