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M.- <br />Surface layer texture: Silt loam <br />Depth to restrictive feature: More than 60 inches <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 />Rago and similar soils: 5 percent <br />Richfield and similar soils: 4 percent <br />Wages and similar soils: 4 percent <br />Lodgepole and similar soils: 1 percent <br />Pleasant and similar soils: 1 percent <br />Management <br />Major uses: Nonirrigated cropland, irrigated <br />cropland, and rangeland <br />The main limitations affecting nonirrigated and <br />irrigated crops are low precipitation and the hazards of <br />soil blowing and water erosion. The Colby soil is also <br />subject to lime- induced chlorosis, low organic matter <br />content, and low fertility. Because the amount of <br />precipitation is not sufficient for annual cropping, the <br />best cropping system for nonirrigated crops is one <br />that includes small grain and summer fallow. Tillage <br />should be on the contour or across the slope. Terraces <br />reduce the runoff rate, help to control erosion, and <br />help to conserve moisture. Irrigation water should be <br />applied at a rate that ensures optimum production <br />without increasing deep percolation, runoff, and <br />erosion. <br />A high content of lime decreases the available <br />supply of most plant nutrients. Chlorosis is apparent, <br />particularly in beans and grain sorghum. Returning <br />crop residue to the soil or regularly adding other <br />organic material improves fertility, minimizes crusting, <br />reduces the hazards of water erosion and soil blowing, <br />and increases the water intake rate. <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, the <br />hazard of soil blowing on all of the soils, and lime - <br />induced chlorosis on the Colby soil. Planting the trees <br />on the contour helps to conserve moisture. Shrubs <br />and trees that are not sensitive to lime- induced <br />chlorosis are suitable for use in windbreaks. <br />Soil Survey of <br />58 —Nunn sandy clay loam, 1 to 3 percent <br />slopes, eroded <br />Setting <br />Location: This map unit occurs dominantly in the <br />northwestern part of the survey area. <br />Elevation: 4,301 to 5,200 feet <br />Mean annual precipitation: 14 to 16 inches <br />Frost -free period: 145 to 150 days <br />Note: This very deep, well drained soil is on nearly <br />level and gently sloping upland terraces. It formed <br />in old alluvium from the Ogallala Formation. The <br />native vegetation is mainly grasses. <br />Component Description <br />Nunn and similar soils <br />Percent of the map unit. 80 percent <br />Landform: Terraces <br />Slope range: 1 to 3 percent <br />Surface layer texture: Sandy clay loam <br />Depth to restrictive feature: More than 60 inches <br />Drainage class: Well drained <br />Parent material. Clayey alluvium <br />Native plant cover type: Rangeland <br />Flooding: None <br />Available water capacity. Mainly 10.5 inches <br />Typical profile: <br />Ap-0 to 8 inches; sandy clay loam <br />Bt1-8 to 15 inches; clay <br />Bt2 -15 to 17 inches; clay loam <br />Bk -17 to 26 inches; sandy clay loam <br />Ck -26 to 44 inches; sandy clay loam <br />C-44 to 60 inches; sandy clay loam <br />Additional components: <br />Kimst and similar soils: 5 percent <br />Richfield and similar soils: 5 percent <br />Olnest and similar soils: 4 percent <br />Pleasant and similar soils: 4 percent <br />Lodgepole and similar soils: 1 percent <br />Rago and similar soils: 1 percent <br />Management <br />Major uses: Nonirrigated cropland, irrigated <br />cropland, and rangeland <br />The main limitations affecting nonirrigated and <br />irrigated crops are the hazard of soil blowing, tilth, <br />restricted permeability, and lime- induced chlorosis <br />in severely eroded areas of this soil. 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. Tillage should be minimized. Maintaining crop <br />residue on or near the surface can help to control <br />