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• Permeability of this Olney soil is moderate. Available water capacity is moderate. Effective <br />rooting depth is 60 inches or more. Runoff is medium to rapid, and the hazard of water <br />erosion is high to very high. The hazard of soil blowing is high. This soil unit is used as <br />rangeland in this permit area. The potential plant community on this unit is mainly blue <br />grama, sideoats grama, and westem wheatgrass. Other grasses that characterize the unit <br />are Indian ricegrasss and sand dropseed. T average annual production of air-dry <br />vegetation is about 900 pounds per acre. If the condition of the range deteriorates, <br />pricklypear, threeawn, sand dropseed, and yucca increase. <br />Soil Unit 62- Otero sandy loam, 1 to 9% slopes. This deep, somewhat excessively <br />drained soil is on uplands with low dunelike relief. It formed in eolian sand. The native <br />vegetation is mainly grass. Elevation is 5500 to 6300 feet. The average annual precipitation <br />is 11 to 15 inches, the average annual air temperature is 50 to 54 degrees F, and the <br />average frost-free period is 135 to 165 days. <br />As a rule, the surface layer is light brownish gray sandy loam about 7 inches thick. The <br />substratum to a depth of 60 inches or more is sandy loam. The soil is mildly alkaline to a <br />depth of 7 inches and moderately alkaline below that depth. <br />Included in this unit is about 20% Kim fine sandy loam in concave areas. Also Permeability <br />of this Otero soil is moderately rapid. Available water capacity is moderate. Runoff is slow <br />to medium; and the hazard of water erosion is slight to very high. Effective rooting depth <br />is 60 inches or more. Included are small areas of Olney sandy loam in narrow drainways. <br />The potential plant community on this unit is mainly sideoats grama, needleandthread, and <br />• little bluestem. Other grasses that characterize the unit are Indian ricegrass, blue grama, <br />and thickspike wheatgrass. The average annual production of air-dry vegetation is about <br />1400 pounds per acre. If the condition of the range deteriorates, threeawn, snakeweed, <br />sand dropseed yucca, and rabbitbrush increase. <br />Soil Unit 68- Razor clay loam, 1 to 12% slopes. This moderately deep, well drained soil <br />is on hills and uplands. It formed in residuum and colluvium derived dominantly from shale. <br />The native vegetation is mainly grass. Elevation is 5500 to 6600 feet. The average annual <br />precipitation is 12 to 15 inches, the average annual air temperature is 49 to 54 degrees F, <br />and the average frost-free period is 125 to 160 days. <br />Typically, the surface layer is yellow brown clay loam about 3 inches thick. The subsoil is <br />mainly clay about 20 inches thick. The substratum is silty clay loam 9 inches thick. Soft <br />shale is at a depth of 32 inches. The soil is moderately alkaline throughout. <br />Included in this unit is about 20 percent deep Manzannola clay loam in drainageways and <br />on foot slopes. Also included are small areas of shallow Midway clay on ridges. <br />Permeability of this Razor soil is slow. Available water capacity is low. Effective rooting <br />depth is 20 to 40 inches. Runoff is medium to rapid, and the hazard of water erosion is <br />moderate to very high. <br />This is rangeland in this permit boundary. The potential plant community on this unit is <br />mainly blue grama and western wheatgrass. Other grasses that characterize the unit are <br />sideoats grama, winterfat, and needleandthread. The average annual production of air-dry <br />vegetation is about 1000 pounds per acre. If the condition of the range deteriorates, <br />• snakeweed, threeawn, galleta, and pricklypear increase. <br />