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28 SOIL SURVEY
<br /> 40—Nunn loam, I to 3 percent slopes. This is a deep, vegetation should be continued for as many years as
<br /> well drained soil on terraces at elevations of 4,550 to 5,000 possible following planting.Trees that am best suited and
<br /> feet. It formed in mixed alluvium. Included in mapping have good survival are Rocky Mountain juniper, eastern
<br /> am small, long and narrow areas of sand and gravel redeedar, ponderosa.pine, Siberian elm, Russian-olive, and
<br /> deposits and small areas of soils that are subject to occa- hackbe"y. The shrubs best suited are 8kunkbush sumac,
<br /> sional flooding. Some leveled areas are also included. lilac, Siberian peashrub, and American plum.
<br /> Typically the surface layer of this Nunn soil is grayish Wildlife is an important secondary use of this soil. The
<br /> brown loam about 12 inches thick. The subsoil is light cropland areas provide favorable habitat for ring-necked
<br /> brownish gray clay loam about 12 inches thick.The upper pheasant and mourning dove. Many nongarne species can
<br /> part of the substratum is light brownish gray clay loam. be attracted by establishing areas for nesting and escape
<br /> The lower part to a depth of 60 inches is brown sandy cover. For pheasants, undisturbed nesting cover is essen-
<br /> loam. tial and should be included in plans for habitat develop-
<br /> Permeability is moderately slow. Available water ment, especially in areas of intensive agriculture. Range-
<br /> capacity is high. The effective moting depth is 60 inches land wildlife, for example, the pronghorn anteloM can be
<br /> or more. Surface runoff is medium, and the erosion attracted by developing livestock watering facilities,
<br /> hazard is low. managing livestock grazing,and reseeding where needed.
<br /> In irrigated areas this soil is suited to all crops com- This soil has fair to poor potential for urban develop-
<br /> monly grown in the area, including corn, sugar beets, ment. It has moderate to high shrink swell, low Btrength,
<br /> beans,alfalfa, small grain, potatoes, and onions. An exam- and moderately slow permeability. These features create
<br /> ple of a suitable cropping system is 3 to 4 years of alfalfa problems in dwelling and road construction. Those am"
<br /> followed by corn,corn for silage, sugar beets,small grain, that have loam or sandy loam in the lower part of the
<br /> or beans. Generally such characteristics as a high clay substratum are suitable for septic tank absorption fields
<br /> content or a rapidly permeable substratum slightly and foundations. Some areas of this soil are adjacent to
<br /> restrict some crops. streams and am subject to occasional flooding. The poten-
<br /> All methods of irrigation are suitable, but furrow ir- tial is fair for Buch recreational development as camp and
<br /> rigation is the most common. Proper irrigation water picnic amas and playgrounds. Capability subclass Ile ir-
<br /> management is essential. Barnyard manure and commer- rigated, 111c nonirrigated; Loamy Plains range site.
<br /> cial fertilizer are needed for top yields. 41—Nunn clay loam, 0 to I percent slopes. This is a
<br /> Most nonirrigated areas am used for small grain. The deep, well drained soil on terraces and smooth plains at
<br /> soil is summer fallowed in alternate years. Winter wheat elevations of 4,550 to 5,150 feet. It formed in mixed allu-
<br /> is the principal crop. If the crop is winterkilled, spring vium and eolian deposits. Included in mapping are small,
<br /> wheat can be seeded. Generally precipitation is too low long and nwn�ow areas of sand and gravel deposits and
<br /> for beneficial use of fertilizer. small areas of soils that are subject to occasional flooding.
<br /> Such practices as stubble mulch fanning, striperopping, Some small leveled amw am also included.
<br /> and minimum tillage are needed to control soil blowing Typically the surface layer of this Nunn soil is grayish
<br /> and water erosion. brown clay loam about 9 inches thick. The subsoil is light
<br /> The potential native vegetation is dominated by blue bmwnish gray clay loam about 14 inches thick.The upper
<br /> grama. Several mid grasses, such as western wheatgrass part of the substratum is clay loam. The lower part to a
<br /> and needleandthread, are also present. Potential produc- depth of Go inches is Bandy loam.
<br /> tion ranges from 1,600 pounds per acre in favorable years Permeability is moderately slow. Available Water
<br /> to 1,000 pounds in unfavorable years. AB range condition capacity is high. The effective rooting depth is 60 inches
<br /> deteriorates, the mid grasses decrease; blue grama, buf- or more. Surface runoff is slow, and the erosion hazard is
<br /> falograss, snakeweed, yucca, and fringed sage increase; low.
<br /> and forage production drops. Undesirable weeds and an- This soil is used almost entirely for irrigated crops. It
<br /> nuals invade the site as range condition becomes poorer. is suited to all crops commonly grown in the area, includ-
<br /> Management of vegetation on this soil should be based ing corn, sugar beets,beans, alfalfa, small grain, potatoes,
<br /> on taking half and leaving half of the total annual produc- and onions. An example of a suitable cropping system is 3
<br /> tion. Seeding is desirable if the range is in poor condition. to 4 years of alfalfa followed by corn, corn for silage,
<br /> Sideoats grama, little bluestem, western wheatgrass, blue sugar beets, small grain, or beans. Few conservation prac-
<br /> grama,pubescent wheatgrass,and crested wheatgrass are tices am needed to maintain top yields.
<br /> suitable for seeding. The grass selected should meet the All methods of irrigation am suitable, but furrow ir-
<br /> seasonal requirements of livestock, It can be seeded into rigation is the most common. Barnyard manure and com-
<br /> a clean, firm sorghum stubble, or it can be drilled into a mercial fertilizer are needed for top yields.
<br /> firm prepared seedbed. Seeding early in spring has Windbreaks and environmental plantings of trees and
<br /> proven most successful. shrubs commonly grown in the area am generally well
<br /> Windbreaks and environmental plantings of trees and suited to this soil. Cultivation to control competing
<br /> shrubs commonly grown in the area am generally well vegetation should be continued for as many years as
<br /> suited to this Soil. Cultivation to control competing possible following planting.Trees that are beat suited and
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