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• and mountain snowberry. The average annual production of air-dry vegetation <br />is about 2,000 pounds per acre. <br />The potential plant community on the Waybe soil is mainly mountain big <br />sagebrush, western wheatgrass, bluebunch wheatgrass, and muttongrass. Other <br />plants that characterize this site are mountain snowberry, Utah serviceberry, <br />and prairie junegrass. The average annual production of air-dry vegetation is <br />about 400 pounds per acre. If the range is overgrazed, the proportion of <br />preferred forage plants decreases and the proportion of less preferred forage <br />plants increases. Therefore, livestock grazing should be managed so that the <br />desired balance of preferred species is maintained in the plant community. <br />Management practices suitable for use on this unit are proper range use, <br />deferred grazing, and rotation grazing. Slope limits access by livestock and <br />results in overgrazing of the less sloping areas. Trails or walkways can be <br />constructed in places to encourage livestock to graze in areas where access is <br />limited. <br />• If the Aaberg soil is used for homesite development, the main limitations <br />are shrink-swell potential, very slow permeability and slope. If buildings <br />are constructed on this soil, properly designing foundations and footings and <br />diverting runoff away from buildings help to prevent structural damage <br />because of shrinking and swelling. The effects of shrinking and swelling can <br />be minimized by using proper engineering designs and by backfilling with <br />material that has low shrink-swell potential. Cutbanks are not stable and are <br />subject to slumping. Permeability is very slow. Use of sandy backfill for <br />the trench and long absorption lines helps to compensate for the very slow <br />permeability. This soil is subject to slippage when it becomes saturated. <br />If the Waybe soil is used for homesite development, the main limitations <br />are depth to bedrock, shrink-swell potential and slope. Excavations for <br />building sites is limited by the bedrock. Cuts needed to provide essentially <br />level building sites can expose bedrock. If buildings are constructed on this <br />soil, properly designing foundations and footings and diverting runoff away <br />from buildings help to prevent structural damage because of shrinking and <br />• swelling. The effects of shrinking and swelling can be minimized by using <br />Ex. 16-12 <br />