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Custom Soil Resource Report <br /> Revised Universal Soil Loss Equation (RUSLE)to predict the average annual rate of <br /> soil loss by sheet and rill erosion in tons per acre per year. The estimates are based <br /> primarily on percentage of silt,sand,and organic matter and on soil structure and Ksat. <br /> Values of K range from 0.02 to 0.69. Other factors being equal, the higher the value, <br /> the more susceptible the soil is to sheet and rill erosion by water. <br /> Erosion factorKw indicates the erodibility of the whole soil.The estimates are modified <br /> by the presence of rock fragments. <br /> Erosion factor Kf indicates the erodibility of the fine-earth fraction, or the material less <br /> than 2 millimeters in size. <br /> Erosion factor T is an estimate of the maximum average annual rate of soil erosion by <br /> wind and/or water that can occur without affecting crop productivity over a sustained <br /> period. The rate is in tons per acre per year. <br /> Wind erodibility groups are made up of soils that have similar properties affecting their <br /> susceptibility to wind erosion in cultivated areas.The soils assigned to group 1 are the <br /> most susceptible to wind erosion, and those assigned to group 8 are the least <br /> susceptible. The groups are described in the"National Soil Survey Handbook." <br /> Wind erodibility index is a numerical value indicating the susceptibility of soil to wind <br /> erosion, or the tons per acre per year that can be expected to be lost to wind erosion. <br /> There is a close correlation between wind erosion and the texture of the surface layer, <br /> the size and durability of surface clods, rock fragments, organic matter, and a <br /> calcareous reaction. Soil moisture and frozen soil layers also influence wind erosion. <br /> Reference: <br /> United States Department of Agriculture, Natural Resources Conservation Service. <br /> National soil survey handbook, title 4304I. (http://soils.usda.gov) <br /> 23 <br />