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10/88 <br />17--Barx-Progresso complex, 3 to 12 percent slopes. This map unit <br />.s on old terraces and mesas. The native vegetation is mainly grasses <br />and sagebrush. Elevation is 5,300 to 6,800 feet. The average annual <br />precipitation ~s 10 to 14 inches, the average annual air temperature <br />~s 46 to 48 degrees F, and the average frost-free period is 110 to 13C <br />days. <br />This unit is 45 percent Barx fine sandy loam and 40 percent <br />Progresso loam. The components of this unit era so intricately <br />intermingled that it was not practical to map them separately at the <br />scale used. <br />Included in this unit is about 5 percent Abra soils, 5 percent <br />Pinon soils and 5 percent Bowdish soils occurring under pinyon-juniper <br />ovarstory. Also included are small areas of Rock outcrop and <br />moderately deep Typic Torriorthents. <br />The Barx soil is deep and well drained. It formed in alluvium <br />derived dominantly from sandstone. Typically, the surface layer is <br />brown fine sandy loam about 2 inches thick. Tha subsurface layer is <br />reddish brown loam 3 inches thick. Th• upper part of the subsoil is <br />yellowish red or light reddish brown sandy clay loam about 18 inches <br />thick. Tha lower 15 inches of th• subsoil is pinkish white loam. Ths <br />upper 13 inches of the substratum is vary pal• brown loam, and the <br />lower part to a depth of 74 inches is pink loam. In som• areas the <br />surface layer is loam or sandy clay loam. <br />Permeability of the Barx soil is moderate. Available water <br />capacity is high. Effective rooting depth is 60 inches or more. <br />Runoff is rapid, and the hazard of water erosion is high. <br />I? ~ <br />