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.