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W, <br />Available water capacity. Mainly 10.4 inches <br />Typical profile: <br />A-0 to 5 inches; silt loam <br />Btl -5 to 12 inches; silty clay <br />Bt2 -12 to 18 inches; silty clay <br />Bt3-18 to 28 inches; silty clay loam <br />C-28 to 60 inches; silt loam <br />Additional components <br />Iliff and similar soils: 5 percent <br />Norka and similar soils: 5 percent <br />Rago and similar soils: 5 percent <br />Pleasant and similar soils: 4 percent <br />Lodgepole and similar soils: 1 percent <br />Management <br />Major uses: Rangeland <br />Controlled livestock management is the major <br />management practice needed on this map unit. <br />If this map unit is used for nonirrigated crops, the <br />main limitation is the hazard of soil blowing. Deep <br />tillage may bring lime to the surface layer, resulting in <br />lime- induced chlorosis. <br />The main limitations affecting windbreaks and <br />environmental plantings are low precipitation and <br />the hazard of soil blowing. Summer fallow, cultivation <br />for weed control, and selection of adapted plants <br />help to ensure the establishment and survival of <br />seedlings. <br />95 —Weld silt loam, 0 to 2 percent slopes <br />Setting <br />Location: This map unit occurs dominantly in the <br />western part of the survey area. <br />Elevation: 4,301 to 5,200 feet <br />Mean annual precipitation: 13 to 15 inches <br />Frost -free period: 145 to 148 days <br />Note: This very deep, well drained soil is on nearly <br />level interfluves. It formed in loess. The native <br />vegetation is mainly grasses. <br />Component Description <br />Weld and similar soils <br />Percent of the map unit. 80 percent <br />Landform: Interfluves <br />Landform element: Summits <br />Slope range: 0 to 2 percent <br />Surface layer texture: Silt loam <br />Depth to restrictive feature: More than 60 inches <br />Soil Survey of <br />Drainage class: Well drained <br />Parent material. Clayey, calcareous loess <br />Native plant cover type: Rangeland <br />Flooding: None <br />Available water capacity: Mainly 10.4 inches <br />Typical profile: <br />A-0 to 5 inches; silt loam <br />Bt1 -5 to 12 inches; silty clay <br />Bt2 -12 to 18 inches; silty clay <br />Bt3-18 to 28 inches; silty clay loam <br />C-28 to 60 inches; silt loam <br />Additional components: <br />Keith and similar soils: 5 percent <br />Norka and similar soils: 5 percent <br />Rago and similar soils: 5 percent <br />Pleasant and similar soils: 4 percent <br />Lodgepole and similar soils: 1 percent <br />Management <br />Major uses: Nonirrigated cropland (fig. 7), irrigated <br />cropland, and rangeland <br />The main limitations affecting nonirrigated or <br />irrigated crops are low precipitation, the hazard of soil <br />blowing, and restricted permeability. Because the <br />amount of precipitation is not sufficient for annual <br />cropping, the best cropping system for nonirrigated <br />crops is one that includes small grain and summer <br />fallow. Leaving crop residue on or near the surface <br />helps to conserve moisture, maintain tilth, and control <br />erosion. Irrigation water should be applied at a rate <br />that ensures optimum production without increasing <br />runoff and erosion. This soil is productive. <br />Controlled livestock management is the major <br />management practice needed on this map unit. <br />The main limitations affecting windbreaks and <br />environmental plantings are low precipitation and <br />the hazard of soil blowing. Summer fallow, cultivation <br />for weed control, and selection of adapted plants <br />help to ensure the establishment and survival of <br />seedlings. <br />96— Weld -Norka silt loams, 0 to 3 percent <br />slopes <br />Setting <br />Location: This map unit occurs dominantly in the <br />western and southern parts of the survey area. <br />Elevation: 4,301 to 5,200 feet <br />Mean annual precipitation: 13 to 15 inches <br />Frost -free period. 145 to 148 days <br />Note: This map unit is on nearly level and gently <br />