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_...., <br />P <br /> <br />1G/6a <br />108--Wrayha stony clay roam, 3 to 40 percent slopes. This deep, <br />well drained soil is on ridges and siae slopes. It formed in residuum <br />derived dominantly from shale. The native vegetation is mainly pinyon <br />pine, Utah juniper, and shrubs. -Elevation is 7,000 to 7,800 feet. <br />The average annual precipitation is 14 to 16 inches, the average <br />annual air temperature is 43 to 45 degrees F, and the average frost- <br />free period is 90 to 110 days. <br />Typically, the surface layer is brown stony clay loam about 7 <br />inches thick. The substratum to a depth of 60 inches or more is light <br />brownish gray clay. In some areas the surface layer is gravelly clay <br />loam or loam. <br />Included in this unit is about 10 percent Rock outcrop, and 5 <br />percent Narragu~nnep sod s. Also included are small areas of Emmons <br />and Radersburg soils. <br />Permeability of this Wrayna soil is slow. Available water <br />capacity is high. Effective rooting depth is 60 inches. Runoff ~s <br />very rapid, and the hazard of water erosion is high. <br />This unit i5 used for livestock grazing and for wildlife habitat. <br />The potential plant community on this unit is mainly pinyon pine <br />and Utah juniper, with an understory of Indian ricegrass, Sandberg <br />blue rass, galleta, and Salina wildrye. The average annual production <br />f~e~~er wtie~f Jr<ss <br />of air-dry understory vegetation is about 500 pounds per acre. <br />If the condition of the understory deteriorates, cheatgrass, <br />annual mustards, and pricklypear cactus increase. Where the <br />understory is in poor condition, these plants are dominant. Grazing <br />should be managed so that the desirable balance of species is <br />maintained in the plant community. <br />