Where,
A = average annual soil loss in t/a (tons per acre)
R = rainfall and runoff erosivity index by geographic location
K = soil erodibility factor; average soil loss per unit of erosion index for a soil cultivated in continuous fallow with a slope of 72.6 feet and an incline of 9%
LS = topographic factor; L is for slope length and S is for slope percent
C = cropping-management factor; the ratio of soil loss for given conditions to that from cultivated
P = conservation practice factor; the ratio of soil loss for a given practice to that for up and down the slope farming