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B/80 <br />• 320--Yamo Ioam, 3 to 15 percent slopes. This deep; well drained soil <br />is on benches hills and tce slopes. It formed in alluvium derived <br />dominantly from sandstone, and in loess. EIevation is 6,200 to 7,000 feet. <br />The average annual precipitation is about II to 13 inches, the average <br />annual air temperature is 42 to 45 degrees F, and the average frost-free <br />period is 75 to 95 days. <br />Typically, the surface layer is pale brown loam 5 inches thick. The <br />subsoil is pale brown loam 10 inches thick. The substratum to a depth of 60 <br />I <br />inches or more is pale brown to v~ry pale brown loam. <br />Included in this unit are small areas of Forelle soils. <br />Permeability of this Yamo soil is moderate. Available water capacity is <br />high. Effective rooting depth is 60 inches or more. Runoff is medium, and <br />the hazard of water erosion is moderate. The hazard of soil blowing is <br />• slight. <br />This unit is used for livestock grazing and wildlife habitat. <br />The potential plant community on this unit is mainly western wheatgrass, <br />streambank wheatgrass, prairie junegrass, bottlebrush squirrel tail, Indian <br />rioegrass, low rabbitbrush, and Wyoming big sagebrush. The average annual <br />production of air-dry vegetation ranges from 600 to 1,200 pourds per acre. <br />Zf the range condition deteriorates, less preferred forage plants <br />increase. In poor condition, uidesirable plants are dominant. Therefore, <br />grazing should be managed so that the desired balance of species is <br />maintained in the plant wmmunity. <br /> <br />-20- <br />