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.