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. ~X ~•. C ~~ ~ ~ • 12,88 <br />56--Mikim loam, 1 to 6 percent slopes. This deep, well drained <br />soil is on alluvial valley floors. It formed in alluvium derived <br />dominantly from calcareous shale. The native vegetation is mainly <br />grasses and shrubs. Elevation is 5,100 to 6,600 feet. The average <br />annual precipitation is 10 to 12 inches, the average annual air <br />temperature is 46 to 48 degrees F, and the average frost-free period <br />is 90 to 120 days. <br />Typically, the surface layer is grayish brown loam about 6 inches <br />thick. The upper 39 inches of the underlying material is light <br />brownish gray and grayish brown loam. The lower part to a depth of 60 <br />inches is grayish brown gravelly sandy loam. In some areas the <br />surface layer is clay loam. <br />Included in this unit is about 5 percent Vananda soils and S <br />~ percent Paradox soils. Also included are small areas of Abra soils. <br />Permeability of this Mikim soil is moderate. Available water <br />capacity is moderate. Effective rooting depth is 60 inches or more. <br />Runoff is slow, and the hazard of water erosion is moderate. This <br />soil is subject to rare flooding. <br />This unit is used mainly for livestock grazing in winter and <br />spring and wildlife habitat. It is also used for irrigated pasture, <br />small grains, alfalfa, and grass hay. <br />The potential pVant community on this unit is mainly galleta, <br />Indian ricegrass, Wyoming big sagebrush, and needleandthread. The <br />.average annual production of air-dry vegetation is about 600 pounds <br />per acre. <br />lF~^, <br />7, <br />~~ 7?'i <br />