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WELD COUNTY, COLORADO, SOUTHERN PART <br />Typically the surface layer of this Colombo soil is dark <br />yish brown clay loam about 14 inches thick. The upper <br />inches of the underlying material is pale brown <br />stratified clay loam and loam. The lower part to a depth <br />of 60 inches is very pale brown loam stratified with thin <br />lenses of fine sand, medium sand, and clay loam. <br />Permeability is moderate. Available water capacity is <br />high. The effective rooting depth is 60 inches or more. <br />Surface runoff is medium, and the erosion hazard is low. <br />In irrigated areas this soil is suited to all crops com- <br />monly grown in the area, including corn, sugar beets, <br />beans, alfalfa, small grain, potatoes, and onions. An exam- <br />ple of a suitable cropping system is 3 to 4 years of alfalfa <br />followed by corn, corn.for silage, sugar beets, small grain, <br />or beans. Land leveling, ditch lining, and installing <br />pipelines may be needed for proper water application. <br />All methods of irrigation are suitable, but furrow ir- <br />rigation is the most common. Barnyard manure and com- <br />mercial fertilizer are needed for top yields. <br />In nonirrigated areas this soil is well suited to winter <br />wheat, barley, and sorghum if it is summer fallowed in al- <br />ternate years. Winter wheat is the principal crop. The <br />predicted average yield is 33 bushels per acre. If the crop <br />is winterkilled, spring wheat can be seeded. Generally <br />,precipitation is too low for beneficial use of fertilizer. <br />Stubble mulch farming, striperopping, and minimum til- <br />€nge are needed to control soil blowing and water erosion. <br />Terracing also may be needed to control water erosion. <br />The potential native vegetation is dominated - by <br />-extern wheatgrass. Blue grama, switchgrass, sand <br />Meedgrass, big bluestem, slender wheatgrass, indiangrass, <br />green needlegrass are also present. Potential produc- <br />ranges from 1,000 pounds per acre in favorable years <br />600 pounds in unfavorable years. As range condition <br />Aeteriorates, the tall grasses decrease, blue grama and <br />?` uffalograss increase, and forage production drops. Un- <br />ble weeds and annuals invade the site and erosion <br />#an occur as range condition becomes poorer. <br />Management of vegetation on this soil should be based <br />Wgrama, half and leaving half of the total annual produc- <br />ing is desirable if the range is in poor condition. <br />wheatgrass, switchgrass, sand reedgrass, <br />pubescent wheatgrass, intermediate <br />Pi,eatgrass, and blue grama are suitable for seeding. The <br />-s selected should meet the seasonal requirements of <br />V-:dbn It can be seeded into a firm prepared seedbed. <br />rill should be used. Seeding early in spring has <br />ost successful.. <br />eaks and environmental plantings of trees and <br />mmonly grown in the area are generally well <br />this soil. Cultivation to control competing <br />should be continued for as many years as <br />ollowing planting. Trees that are best suited and <br />d survival are Rocky Mountain juniper, eastern <br />ponderosa pine, Siberian elm, Russian-olive, and <br />The shrubs best suited are skunkbush sumac, <br />rian peashrub, and American plum. <br />17 <br />Wildlife is an important secondary use of this soil. The <br />cropland areas provide favorable habitat for ring-necked <br />pheasant and mourning dove. Many nongame species can <br />be attracted by establishing areas for nesting and escape <br />cover. For pheasants, undisturbed nesting cover is essen- <br />tial and should be included in plans for habitat develop- <br />ment, especially in areas of intensive agriculture. Range- <br />land wildlife, for example, the pronghorn antelope, can be <br />attracted by developing livestock watering facilities, <br />managing livestock grazing, and reseeding where needed. <br />Where this soil is on flood plains and is susceptible to <br />flooding, it has poor potential for urban and recreational <br />development. On the higher terraces, potential is fair. <br />Dwelling and road designs may need to be modified to <br />compensate for the limited capacity of this soil to support <br />a load and to protect it against frost action. Capability <br />subclass He irrigated, IIIe nonirrigated; Clayey Plains <br />range site. <br />21=Dacono c?aploam,'0 to 1percent'sbpes. This is a <br />deep, well drained soil on terraces at elevations of 4,550 <br />to 4,970 feet. It formed in mixed alluvium. Included in <br />mapping are small, long and narrow areas of sand and <br />gravel deposits and some small leveled areas. <br />Typically the surface layer of this Dacono soil is gray- <br />ish brown clay loam about 12 inches thick. The subsoil is <br />grayish brown clay loam about 15 inches thick. The sub- <br />stratum is very gravelly sand. <br />Permeability is moderately slow. Available water <br />capacity is moderate. The effective rooting depth is 20 to <br />40 inches. Surface runoff is slow, and the erosion hazard <br />is low. <br />This soil is used almost entirely for irrigated crops. It <br />is suited to all crops commonly grown in the area, includ- <br />ing corn, sugar beets, beans, alfalfa, small grain, potatoes, <br />and onions. An example of a suitable cropping system is 3 <br />to 4 years of alfalfa followed by corn, corn for silage, <br />sugar beets, small grain, or beans. Generally, such charac- <br />teristics as a high clay content or a rapidly permeable <br />substratum slightly restrict some crops. <br />All methods of irrigation are suitable, but furrow ir- <br />rigation is the most common. Proper irrigation water <br />management is essential. Barnyard manure and commer- <br />cial fertilizer are needed for top yields. <br />Windbreaks and environmental plantings of trees and <br />shrubs commonly grown in the area are generally well <br />suited to this soiL Cultivation to control competing <br />vegetation should be continued for as many years as <br />possible following planting. Trees that are best suited and <br />have good survival are Rocky Mountain juniper, eastern <br />redcedar, ponderosa pine, Siberian ehn, Russian-olive, and <br />hackberry. The shrubs best suited are skunkbush sumac, <br />lilac, Siberian peashrub, and American plum. <br />Openland wildlife, such as pheasant, mourning dove, <br />and cottontail are best suited to this soil Wildlife habitat <br />development, including tree and shrub plantings and <br />grass plantings to serve as nesting areas, should be suc- <br />cessful without irrigation during most years. Under ir- <br />rigation, good wildlife habitat can be established, benefit- <br />ing, many kinds of openland wildlife.