Soil Erodibility

Wischmeier (1969) calculated the empirical universal soil loss equation's erodibility factor K for specific soils. For the calculations he considered the following properties that contributed significantly to soil loss variance:

percentages of sand, silt, clay and organic matter,
pH,
structure and bulk density of plow layer and subsoil,
steepness and concavity or convexity of slope,
pore space filled by air,
residual effects of sod crops,
aggregation,
parent material and
various interactions of these variables.