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WELD COUNTY, COLORADO, SOUTHERN PART Most methods of irrigation are suitable, but furrow ir- rigation is the moat common. Proper irrigation water management is essential Barnyard manure and rnmmer- cial fertilizer are needed for top yields. In nonirrigated areas this soil is suited to winter wheat, bazley, and sorghum. Most of the acreage is planted to winter wheat The predicted average yield Ls 25 bushels per acre. The soil is summer followed in alternate years to allow moisture accumulation Generally precipitation is too low for beneficial use of fertilizer. Stubble mulch farming, stripcropping, and minimum til- lage are needed to control soil blowing and water erosion. The potential native vegetation is dominated by western wheatgrass and blue grams. Buffalogtass is also present Potential production ranges from 1.000 pounds in favorable years to 600 pounds in unfavorable years. As range condition deteriorates, a blue grams-buffalograss ecd forms. Undesirable weeds and annuak invade the site ae range condition becomes poorer. Management of vegetation on this soil should be based on taking half and leaving half of the total annual produc- tion Range pitting can help in reducing runoff. Seeding is desirable if the range is in poor condition Western wheatgrass, blue grams, sideoats grams, buffalograas, pu- bescent wheatgrass, and tnested wheatgrass are suitable for seeding. The grass selected should meet the seasonal requirements of livestock It can be seeded into a dean, firm sorghum stubble, or it can be drilled into a firm prepared seedbed. Seeding early in spring has proven most successful Windbreaks and environmental plantings are generally not suited to this soil Onsite investigation is needed to determine if plantings aze feasible. Successful windbreaks require supplemental water. Openland wildlife, such as pheasant, mourning dove, and cottontail, are best suited to this soil Supplemental water is needed in wildlife habitat development, including the tree and shrub plantings that serve ae nesting areas. This soil has poor potential for urban and recreational development Slow permeability and high shrink swell eseate problems in dwelling and road construction. Capa- bility subclO¢e Its irrigated, IVs nonirrigated; Clayey Plains range site. 28-Heldt silty clay, 3 to 5 percent slopes. This is a deep, moderately well drained soil on plains at elevations of 4,950 to 5,050 feet It formed in alluvial sediment derived from shale. Included in mapping are small areas of soils that have a clay loam or silt loam subsoil and sub stratum. Typically the surface layer is light brownish gray and light yellowish brown silty day about 7 inches thick. The subsoil is light brownish gray silty clay about 21 inches thick. The substratum to a depth of 60 inches is silty day. Permeability is slow. Available water capadty l high. The effective rooting depth is 60 inches or more. Surface runoff is medium, and the erosion hazard is moderate. In irrigated areas this soil is suited to crops commonly grown in the area Perennial grasses and alfalfa or close u grown crops should be grown at least 50 percent of the time. Contour ditches and corrugations can be used in it rigating close grown crops and pasture. Furrows, contour furrows, and cross slope furrows are suitable for mw crops. Keeping tillage to a minimum and utilizing croF residue help to control erosion. Maintaining fertility isun- portant. Crops respond to applications of phosphorus anc nitrogen. In nanirrigated areas this soil is suited to winter wheat. barley, and sorghum. Most of the acreage is planted to winter wheat The predicted average yield is 20 bushel per acre. The soil is summer followed in alternate years to allow moisture aceumulation. Generally precipitation is too low for beneficial use of fertilizer. Stubble mulch farming, stripcropping, and mimimum tillage are needed .to control soil blowing and water ero- Sion. Terracing also may be needed to control water em lion. The potential native vegetation is dominated by western wheatgrbgs and blue grams. Buffalograss is also present Potential production ranges from 1,000 pounds per acre in favorable years to 600 pounds in unfavorable years. As range condition deteriorates, a blue grams-buf- falograss sod forms. Undesirable weeds and annuals in- vade the site as range condition becomes poorer. Management of vegetation on this soil should be based on taking half and leaving half of the total annual produc- tion Range pitting ran help in reducng runoff. Seeding is desirable if the range is in poor condition Western wheatgrass, blue grams, sideoats grams. buffalograss, pu- bescent wheatgrass, and crested wheatgrass are suitable for seeding. The grass selected should meet the seasonal requirements of Gvestoek. It can be seeded into a clean. £um sorghum stubble, or it can be drilled into a firm prepared seedbed. Seeding early in spring has proven moat suxessfuL Windbreaks and environmental plantings generally are not suited to this soil Onsite investigation is needed to determine if plantings aze feasible. Successful windbreaks require supplemental water. Openland wildlife, such as pheasant, mourning dove, and cottontail, are best suited co this soil Supplemental water is needed for wildlife habitat development, includ- ing tree and shrub plantings that serve as nesting areas. This soil has poor potential for urban and recreational development Slow permeabiity and high shrink swell create problems in dwelling and road construction. Capa- bility subclass IIIe irrigated, IVs nonirrigated; Clayey Plains range site. 29-Julesburg sandy loam, 0 to 1 percent slopes. This is a deep, well drained soil on terraces at elevations of 4,700 to 4,800 feet It formed in alluvium deposited by the South Platte River. Included in mapping are some leveled areas and small areas of soils that have a Loamy sub- stratum. Typically the surface layer of this Julesburg soil is brown sandy loam about 12 inches thick. The subsoil is brown and pale brown sandy loam about 18 inches thick