SOIL erosion is the end result of two physical processes the detachment of soil particles from a soil mass and the transport of these particles away from the point of detachment. The detachment process generally occurs as a result of two different sets of forces. Detachment occurring in small channels or rills is the result of the forces of flowing water while detachment in the nearly level areas between rills is the result of raindrop impact. The type of erosion occurring, rill or interrill, is determined by the physical characteristics of the soil and the relative strength of the eroding agents (Young and Onstad, 1982). Whether an eroded soil particle originates from the tilled layer within a rill or from the surface of the soil between rills can have a significant affect on the yield of chemical absorbed on soil from a field and subsequent soil productivity (Foster et al., 1983). The objective of this paper was to develop a laboratory method of characterizing the susceptibility of a soil to rill or interrill erosion..
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Robert Young (1984) studied this question.