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~. <br />6/82 <br />• ~G <br />10E--Sulkley silty clay loam, 12 to 25 percent slopes. This is a <br />deep, well drained soil is on hillsides. I[ formed in alluvium and residuum <br />from shale. Elevation is 6,300 to 7,000 feet. The average annual <br />precipitation is about 15 to 17 inches, the average annual air temperature <br />is about 41 to 43 degrees F, and the frost-free season is 75 to 95 days. <br />Typically, the surface layer is dark grayish brown silty clay loam <br />about 4 inches thick. The subsoil is brown silty clay about 42 inches <br />thick. The substratum is light yellowish brown silty clay to 60 inches or <br />more. <br />Included in this unit are small areas of Abor silty clay and Absher <br />fine sandy loam. Small areas with stones on the surface are included. <br />Permeability of this Bulkley soil is very slow. Available water <br />• capacity is high. Effective rooting depth is 60 inches or more. Runoff is <br />rapid, and the hazard of water erosion is high. <br />Most of this unit is used for nonirriga[ed crops. Small areas are used <br />for livestock grazing and wildlife habitat. <br />If this unit is used for nonirrigated craps, the main limitations are <br />high hazard of erosion and clayey soil texture. Crop residue left on or <br />near the surface helps to conserve moisture, maintain tilth, and control <br />erosion. Erosion can be reduced if fall grain is seeded early, <br />stubble-mulch tillage is used, and tillage and seeding .are on the contour or <br />across the slope. Also, waterways should be shaped and seeded to perennial <br />grass. Because of the clayey soil texture, tillage operations should be <br />done when the soil is at the proper moisture content. <br /> <br />