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Page ~ G~ <br />7/h6 <br />• 21C--Callan loam, 3 to 6 percent slopes. This deep, well drained <br />soil is on mesa tops and high terraces. It formed in allwivn derived <br />daninantly Eras sandstone aryl shale. The native vegetation is mainly <br />grasses and shrubs.. Elevation is 6,800 to 7,400 feet. The average annual <br />precipitation is 15 to 17 inches, the average annual air temperature is 4~ <br />to 45 degrees F, and the average frost-free period is 90 to 110 days. <br />Typically, the surface layer is brown loam 4 inches thick. The <br />subsurface layer is dark brown clay loam 4 inches thick. The subsoil is <br />brown clay loafs 14 inches thick. The next layer is a light brown clay loam <br />26 inches thick. The next layer is a buried subsoil of brawn clay loam 12 <br />inches thick. In sane areas the surface layer is silty clay loam. <br />Included in this unit are about 5 percent Skein soils and 5 percent <br />Gurley soils and 5 percent soils that are similar to these Callan soils but <br />have less than 35 percent clay in the particle size control section. Also <br />included are small areas of Haplaquolls, cool occurring in small <br />intermittent drainages. <br />Permeability of this Callan soil is slag. Available water capacity is <br />high. Effective rooting depth is 60 inches or more. Runoff is medium, and <br />the hazard of water erosion is slight to high. <br />This unit is used mainly for irrigated pasture, small grains, alfalfa, <br />and grass hay (fig. 6). It is also used for livestock grazing in sprir~, aryl <br />fall anti for wildlife habitat. <br />The potential plant cofmn~nity on this unit is mainly muttongrass, Indian <br />ricegrass, western wheatgrass, and Wyaning big sagebrush. The average <br />annual production of air-dry vegetation is about 1,lUU pounds per acre. <br /> <br />