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loses <br />2--Abra loam, 3 to 6 percent slopes. This deep, we11 drained soil <br />is on high terraces, alluvial fans, and alluvial valley floors. It <br />formed in alluvium derived dominantly from sandstone. The native <br />vegetation is mainly grasses and shrubs. Elevation is 5,500 to 6,800 <br />feet. The average annual precipitation is 12 to 14 inches, the <br />average annual air temperature is 47 to 49 degrees F, and the average <br />frost-free period is 110 to 130 dzys. <br />Typically, the surface layer i reddish brown loam about 3 inches <br />thick. The upper 5 inches of the subsoil is light reddish brown loam. <br />The lower 24 inches is pink loam. The lower part to a depth of 60 <br />inches or more is very pale brown very gravelly sandy loam. In some <br />areas the surface layer is fine sandy loam. <br />Included in this unit is about S percent 8arx soils and 5 percent <br />Clapper soils. Also included are mall areas of Progresso soils and <br />Ustic Torriorthents. <br />Permeability of this Abra soil is moderate. Available water <br />capacity is moderate. Effective rooting depth is 60 inches or more. <br />Runoff is medium, and the hazard of water erosion is moderate. <br />This unit is used mainly for livestock grazing in spring and fall <br />and for wildlife habitat. It is also used far irrigated corn for <br />silage, pasture, small grains, alfalfa and grass hay. <br />The potential plant community en this unit is mainly galleta, blue <br />grama, Indian ricegrass, and Wyoming big sagebrush. The average <br />annual production of air-dry vegetation is about 700 pounds per acre. <br /> <br />~o <br />~~~ <br />