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<br />• R8-CD Falfa clay loam, 3 to 8 percent slopes <br />This deep, well drained soil is on gently sloping to sloping mesa <br />tops. It formed in calcareous loess. Elevation is 6,500 to 7,000 feet. <br />The average annual precipitation is 16 to 18 inches. Theaverage annual <br />air temperature is about 47 degrees. The average frost-free season is <br />100 to 120 days. <br />~-L <br />Typically, the surface layer is reddish gray clay loam about 4 inches <br />thick. The upper part of the subsoil is reddish gray and reddish brown clay <br />loam about 13 inches thick. The middle part of the subsoil is reddish brown <br />clay about 47 inches thick. The lower part of the subsoil is reddish brawn <br />_lay loam about 16 inches thick. The substrat~n is pink loam to a depth of <br />winches or more. <br />• Included in this unit is about 25 percent Cora soils, soils similar <br />to Falfa but lacking mollic surface layers, and small areas of Witt and <br />Mobridge loans. <br />Permeability is slow, and effective rooting depth is 60 inches or more. <br />Available water capacity is high and erosion hazard is moderate. <br />This soil is used mainly Eor irrigated crops, nonirrigated crops, <br />rangeland, and homesites. The main crops grown in irrigated areas are corn <br />for ensilage, small grains such as wheat, barley, and oats, pasture, and <br />alfalfa hay. The main crop grown in nonirrigated areas is winter wheat. <br />In irrigated areas, the primary concerns of management are controlling <br />erosion by water, maintaining the organic matter content and fertility of <br />the surface layer, and proper use of irrigation water. Incorporating crop <br />residues into and on the surF2ce will improve water infiltration, tilth, <br />• help prevent soil erosion and help maintain adequate organic matter in the <br />