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' 68 - Ustic Torriorthents, moderately steep <br /> ' (Information supplied by Soil Conservation Service) <br /> This is a deep, excessively drained soil on terrace breaks and escarp- <br /> ments at elevations of 4450 to 5100 feet. It formed in gravelly alluvium <br /> on slopes of 9 to 25 percent. <br /> ' Included in this`unit are some soils with pockets of sandy loam and <br /> loam in the underlying material . <br /> Typically the surface layer is pale brown gravelly sand about 10 inches <br /> ' thick. The underlying material , to a depth of 60 inches is pale brown <br /> gravelly sand. <br /> ' Permeability is rapid. Available water capacity is low. Effective <br /> rooting depth is 60 inches or more. Surface runoff is medium and erosion <br /> 1 hazard is moderate. <br /> t1i The potential native vegetation on this site is dominated by little <br /> bluestem, sideoats grams, sand reedgrass, blue grama, hairy grama, switchgrass <br /> ' and needle-and-thread. Potential production ranges from 700 pounds per acre <br /> in favorable years to 200 pounds per acre in unfavorable years. When range <br /> condition deteriorates, the tall and mid-grasses decrease, blue grama and <br /> thairy grama increase and production drops. <br /> Management of vegetation should be based on taking half or less of the <br /> ' total annual production. Since this site does not readily lend itself to <br /> seeding or any mechanical treatment, deferred grazing is a practical method <br /> tof improving range condition. <br /> ' Windbreak and environmental plantings are generally not suited to this <br /> soil . On-site investigation is needed to determine if plantings are feasible. <br /> 1 <br /> 1 <br /> 1 <br />