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<br />8/BO <br />• 31E-Yamo loam. 15 to 30 percent slopes. This deep, well drained <br />soil is on hillsides. I[ Formed in residuum derived dominantly from <br />weathered sandstone. 8levation is 6,100 to 7,000 feet. The average annual <br />precipitation is about 11 to 13 inches, the average annual air temperature <br />is 41 to 45 degrees F, and the average frost-free period is 75 to 95 days. <br />Typically, the surface layer is pale brown loam 5 inches Chick. The <br />subsoil is pale brown loam 10 inches thick. The substratum to a depth of 60 <br />inches or more is pale brown to very pale brown Loam. <br />Included in this unit are a few small areas of a similar soil that has <br />sandstone bedrock at a depth of 10 to 40 irrhes. Also included ane small <br />areas of lock outcrop. <br />Permeability of this Yamo soil is moderate. Available water capacity is <br />high. Effective rooting depth is 60 inches or more. Runoff 1s medium, and <br />• the hazard of water erosion is moderate. The hazard of soil blowing is <br />moderate. <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 tall, Irdian <br />ricegrass, low rabbitbrush, and Wyoming big sagebrush. The average annual <br />production of air~dry vegetation ranges from 600 to 1,100 pounds per acre. <br />If the range cordition deteriorates, less preferred forage plants <br />increase. In poor condition, urdesitable planes ane dominant. Therefore, <br />grazing should be managed so that the desired balance of species is <br />maintained in the plant community. <br />u <br />-22- <br />