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w ELU COL'~T]", COLOH.4 UO, SOCTH EE? PAP.T u have good survival are Rocky Mountain juniper, eastern redcedar. ponderosa pine. Siberian elm. Russian-olive, and haekberr}~. The shrubs best suited are skunkbush sumac. lilac, Siberian peashrub. and American plum. Vildlife is an important secondary use of this soil. The cropland areas provide favorable habitat for ring-necked pheasant and mourning dove. Many nongame species can be attracted b}' establishing areas for nesting and escape cover. For pheasants, undisturbed nesting cover is essen- tial and should be included in plans for habitat develop- ment, especially in azeas of intensive agriculture. This soil has fair to poor potential for urban develop- ment. It has moderate to high shrink swell, low strength. and moderately slow permeability. These features create problems in dwelling and road construction. Those azeas that have loam or sandy loam in the lower pare of the substratum aze suitable for septic tank absorption fields and foundations. Some areas of this soil are adjacent to streams and are subject to occasional flooding. The poten- tial is fair for such recreational development as camp and picnic areas and playgrounds. Capabilic}• class I irrigated. 42-Nunn clay loam. 1 to 3 percent slopes. This is a deep, well drained soil on terraces and smooth plains ae elevations of 4.550 to 5.150 feet. It formed in mixed allu- vium and eolian deposits. Included in mapping are small. long and narrow azeas of sand and gravel deposits and small areas of soils that aze subject to occasional flooding. Some leveled areas are also included. Typically the surface layer of this Nunn soil is grayish brown clay loam aobut 9 inches thick. The subsoil is light brownish gray clay loam about 14 inches thick. The upper par[ of the substratum is light brownish gray clay loam. The lower part to a depth of 60 inches is brown sandy loam. Permeability is moderately slow. Available water capacity is high. The effective rooting depth is 60 inches or more. Surface runoff is medium, and the erosion hazard is low. In irrigated areas this soil is suited to al] crops com- monly grown in the area including corn, sugar beets, beans, alfalfa, small grain, potatoes, and onions. An exam- ple of a suitable cropping system is 3 to 4 years of alfalfa followed by corn, corn for silage, sugar beets, small grain, or beans. Generally such characteristics as the high clay content or the rapidly permeable substratum slightly restrict some crops. All methods of irrigation aze suitable, but furrow ir- rigation is the most common. Proper irrigation water management is essential. Barnyard manure and commer- cial fertilizer are needed for top yields. In nonirrigaced azeas most of the acreage is in small grain and it is summer followed in alternate years. Winter wheat is the principal crop. The predicted average yield is 33 bushels per acre. If the crop is winterkilled, spring wheat can be seeded. Generally precipitation is too low for beneficial use of fertilizer. Stubble mulch farming, stripcropping, and minimum til- lage are needed [o control soil blowing and water erosion. ny The potential native vegetation lo- dominated b}' western wheacgrass and blur Qrama. Buffxlograss is also present. Potential production range= from ].U(JO pounds per acre in favorable year= to (i00 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 of 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. sideoacs grams, buffalograss, pu- bescent wheatgrass. and crested wheatgrass are suitable for seeding. The grass selected should meet the seasonal requirements of livestock. It can be seeded into a clean, firm sorghum stubble, or i[ can be drilled into a firm prepared seedbed. Seeding early in spring has proven most successful. W"indbreaks and envvonmental plantings are generally well suited to this soil. Cultivation co control competing vegetation should be continued for as mom' years as possible following planting. Trees chat are best suited and have good survival are Rock} Mountain juniper, eastern redcedar. ponderosa pine. Siberian elm, Russian-olive, and hackberry. The shrubs best suited are skunkbush sumac. lilac. Siberian peashrub. and American plum. Wildlife is an important secondan' use of this soil. The cropland areas provide favorable habits[ for ring-necked pheasant and mourning dove. Man}• nongame species ran be attracted by establishing areas for nesting and escape cover. For pheasants, undisturbed nesting cover is essen- tial and should be included in plans for habitat develop- ment, especially in areas of intensive agriculture. Range- land wildlife, for example, the pronghorn antelope, can be attracted by developing livestock watering facilities. managing livestock grazing, and reseeding where needed. This soil has fair to poor potential for urban develop- ment. I[ has moderate to high shrink swell, low strength, and moderatel}• slow permeability. These features create problems in dwelling and road construction. Those areas that have loam or sand}• loam in the lower part of the substratum are suitable for septic tank absorption fields and foundations. Some areas of this soil are adjacent to streams and are subject to occasional flooding. The poten- tial is fair for such recreational development as camp and picnic areas and playgrounds. Capability subclass Ile ir- rigated,IIIc nonirrigated; Clayey Plains range site. 43-Nunn loamy sand. 0 to 1 percent slopes. This is a deep, well drained soil on terraces at elevations of 4,700 to 4,900 feet. It formed in alluvium along Box Elder Creek. Included in mapping are small areas of soils that have a loamy subsoil and small areas of soils that are sub- ject to rare flooding. Typically the surface layer of [his Nunn soil is brown loamy sand overburden about 9 inches thick. The subsoil is dark to very dark grayish broom clay loam about 21 inches thick. The substratum to a depth of 60 inches is loamy very fine sand, loamy sand. or sand.