The four factors used in USLE are given below with their origin.
1. Erosion Factor (E): This factor is obtained from the Universal Soil Loss Equation (USLE) and is used to estimate the soil loss caused by the erosive forces of water and wind. It takes into account the erosive power of precipitation, intensity of runoff, length of slope, and character of the soil.
2. Cover and Management Factor (C): This factor is obtained from the USLE and is used to calculate the effects of soil management practices on soil erosion. It is based on the amount and type of vegetative cover, the degree of soil surface protection, and the type of tillage used.
3. Support Practice Factor (P): This factor is obtained from the USLE and is used to calculate the effects of soil management practices on soil erosion. It is based on the use of conservation practices such as terraces, contour farming, or strip cropping.
4. Soil erodibility Factor (K): This factor is obtained from soil survey data and is used to express the relative susceptibility of soils to erosion. It is completely out of the hands of the soil user.
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