A key point is that soil erodibility is determined under the standard reference condition where management effects have been eliminated by maintaining the unit plots in a continuous tilled, fallow conditions for a number of years.
	The K value that is used if for the soil fines, but the influence of rock fragments in the soil profile should be considered in setting K values.
	The effects of rock fragments on the soil surface is considered in the cover-management computations.
	Do not use a K value that has been adjusted for rock fragments on the soil surface because use of such an adjusted K value can cause a major mathematical error in RUSLE2.
	RUSLE2 computes a time varying K value as a function of monthly temperature and rainfall.
	In contrast to RUSLE1, the time varying K value can be used throughout the US except in the Northwest Wheat and Range Region (NWRR).