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WELD COUNTY, COLORADO, SOUTHERN PART 23 Windbreaks and environmental plantings of trees and The potential native vegetation is dominated by blue shrubs commonly grown in the area are generally well grama. Several mid grasses, such as western wheatgrass suited to this soil. Cultivation to control competing and needleandthread, are also present. Potential produc- vegetation should be continued for as many years as tion ranges from 1,600 pounds per acre in favorable years possible following planting. Trees that are best suited and to 1,000 pounds in unfavorable years. As range condition have good survival are Rocky Mountain juniper, eastern deteriorates, the mid grasses decrease; blue grama, buf- redcedar, ponderosa pine, Siberian elm, Russian-olive, and falograss, snakeweed, yucca, and fringed sage increase; hackberry. The shrubs best suited are skunkbush sumac, and forage production drops. Undesirable weeds and an- Siberian peashrub, lilac, and American plum. nuals invade the site as range condition becomes poorer. Wildlife is an important secondary use of this soil. The Management of vegetation on this soil should be based cropland areas provide favorable habitat for ring-necked on taking half and leaving half of the total annual produc- pheasant and mourning dove. Many nongame species can tion. Seeding is desirable if the range is in poor condition. be attracted by establishing areas for nesting and escape Sideoats grama, little bluestem, western wheatgrass, blue cover. For pheasants, undisturbed nesting cover is essen- grama, pubescent wheatgrass, and crested wheatgrass are tial and should be included in plans for habitat develop- suitable for seeding. The grass selected should meet the ment, especially in areas of intensive agriculture. seasonal requirements of livestock. It can be seeded into This soil has good potential for urban and recreational a clean, firm sorghum stubble, or it can be drilled into a development. Increased population growth in the survey firm prepared seedbed. Seeding early in spring has area has resulted in increased homesite construction. The proven most successful. chief limiting feature for urban development and road Windbreaks and environmental plantings of trees and construction is the limited capacity of the soil to support shrubs commonly grown in the area are generally well a load. Septic tank absorption fields function properly, but suited to this soil. Cultivation to control competing community sewage systems should be provided if the vegetation should be continued for as many years as population density increases. Because of the permeability possible following planting. Trees that are best suited and of the substratum, sewage lagoons must be sealed. have good survival are Rocky Mountain juniper, eastern Lawns, shrubs, and trees grow well. Capability class I ir- redcedar, ponderosa pine, Siberian elm, Russian-olive, and ted hackberry. The shrubs best suited are skunkbush sumac, 32—Kim loam Ito 3 percent slopes rI'his is a deep, lilac, Siberian peashrub, and American plum. Wildlife is an important secondary use of this soil. The well drained soil on smooth plans anZc alluvial fans at cropland areas provide favorable habitat for ring-necked deposit and pare elevations of pare to 5,250 feet. It formed in mixed eolian pheasant and mourning dove. Many nongame species can parent sediment from a wide variety of be attracted by establishing areas for nesting and escape bedrock. Included in mapping are small areas of soils that have loamy sand underlying material. cover. For pheasants, undisturbed nesting cover is - me and should be included in plans for habitat develop- Typically the surface layer is brown and pale brown loam about 12 inches thick. The upper 28 inches of the un- ent, especially in areas of intensive agriculture. Range- derl land wildlife, for example, the pronghorn antelope, can be ying material is pale brown loam. The lower part to a attracted by developing livestock watering facilities, depth of 60 inches is pale brown fine sandy loam. managing livestock grazing, and reseeding where needed. Permeability is moderate. Available water capacity is This soil has good potential for urban and recreational high. The effective rooting depth is 60 inches or more. development. Increased population growth in the survey Surface runoff is medium, and the erosion hazard is low. area has resulted in increased homesite construction. The In irrigated areas this soil is suited to all crops corn- chief limiting soil feature for urban development and road monly grown in the area, including corn, sugar beets, construction is the limited capacity of this soil to support beans, alfalfa, small grain, potatoes, and onions. An exam- a load. Septic tank absorption fields function properly, but Pie of a suitable cropping system is 3 to 4 years of alfalfa community sewage systems should be provided if the followed by corn, corn for silage, sugar beets, small grain, population density increases. Because of the permeability or beans. Land leveling, ditch lining (fig. 6), and installing of the substratum, sewage lagoons must be sealed. Pipelines may he needed for proper water applications. Lawns, shrubs, and trees grow well. Capability subclass All methods of irrigation are suitable, but furrow ir- IIe irrigated, IVe nonirrigated; Loamy Plains range site. rigation is the most common. Barnyard manure and com- 33—Kim loam, 3 to 5 percent slopes. This is a deep, mercial fertilizer are needed for top yields. well drained soil on plains and alluvial fans at elevations In nonirrigated areas this soil is suited to winter wheat, of 4,900 to 5,250 feet. It formed in mixed eolian deposits barley, and sorghum. Most of the acreage is planted to and parent sediment from a wide variety of bedrock. In- winter wheat and is summer fallowed in alternate years cluded in mapping are small areas of soils that have to allow moisture accumulation. Generally precipitation is loamy sand underlying material. too low for beneficial use of fertilizer. Typically the surface layer is brown and pale brown Stubble mulch farming, striperopping, and minimum til- loam about 10 inches thick. The upper 28 inches of the un- lage are needed to control soil blowing and water erosion. derlying material is pale brown loam. The lower part to a Terracing also may be needed to control water erosion. depth of 60 inches is pale brown fine sandy loam.