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2.04.9 <br />Soil Map Unit No. 1B <br />Barx fine sandy loam, 3 to 6 percent slopes. This deep, <br />well drained soil is on terraces and mesas and is formed in al- <br />luvium derived dominantly from sandstone. The native vegetation <br />is mainly grasses and shrubs. Elevation is 5,300 to 6,800 feet. <br />The average annual precipitation is 10 to 14 inches, the average <br />annual air temperature is 46 to 48 degrees F, and the average <br />frost-free period is 110 to 130 days. <br />Typically, the surface layer is brown fine sandy loam about <br />2 inches thick. The subsurface layer is a reddish brown loam 3 <br />inches thick. The upper part of the subsoil is yellowish red or <br />light reddish brown sandy clay loam 18 inches thick. The lower <br />15 inches of the subsoil is pinkish white loam. The upper 13 <br />inches of the substratum is very pale brown loam, and the lower <br />part to a depth of 74 inches or more is pink loam. In some areas <br />the surface laver is loam or sandy clay loam. <br />Included in this unit is about 10 percent Abra soils and 5 <br />percent Progresso soils. :also included are small areas of Clap- <br />per soils and Nyswonger soils occurring in the small intermittent <br />drainages. <br />Permeability of this Barx soil is moderate. Available caster <br />capacity is high. Effective rooting depth is fi0 inches or more. <br />• Run-off is medium, and the hazard of water erosion is moderate. <br />Most areas of this unit are used for livestock grazing and <br />wildlife habitat. A few areas are used for irrigated corn for <br />silage, pasture, small grains, alfalfa hay, and grass hay. <br />The potential plant community on this unit is mainly western <br />wheatgrass, Sandberg bluegrass, Wyoming big sagebrush and needl- <br />eandthread. The average annual production of air-dry vegetation <br />is about 850 pounds per acre. <br />If the condition of the range deteriorates, broom snakeweed, <br />Fendler threeawn, cheatgrass, and annual sunflowers increase. <br />Where the range is in poor condition, these plants are dominant. <br />Grazing should be managed so that the desirable balance of spe- <br />cies is maintained in the plant community. <br />If the range vegetation is seriously deteriorated, seeding <br />is needed. For successful seedings, a seedbed should be prepared <br />and the seeds drilled. The plants selected for seeding should <br />meet the seasonal requirements of livestock or wildlife or both. <br />• 2.04-20 <br />