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28 SOIL SURVEY
<br />40-Nunn loam, 1 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 are best suited and
<br />feet. It formed in mixed alluvium. Included in mapping have good survival are Rocky Mountain juniper, eastern
<br />are 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- hackberry. The shrubs best suited are skunkbush sumac
<br />
<br />sional flooding. Some leveled areas are also included. ,
<br />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 nongame 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 rooting depth is 60 inches land wildlife, for example, the pronghorn antelope, can be
<br />or more. Surface runoff is medium, and the erosion
<br />hazard is low attracted by developing livestock watering facilities,
<br />. 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,
<br />beans, alfalfa
<br />small grain
<br />potatoes
<br />and onions
<br />A meat. It has moderate to high shrink swell, low strength,
<br />,
<br />,
<br />,
<br />.
<br />n exam-
<br />ple of a suitable cropping system is 3 to 4 years of alfalfa and moderately slow permeability. These features create
<br />problems in dwelling and road construction Those areas
<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 are subject to occasional flooding. The poten-
<br />All methods of irrigation are suitable, but furrow ir- tial is fair for such recreational development as camp and
<br />rigation is the most common. Proper irrigation water picnic areas and playgrounds. Capability subclass Ile ir-
<br />management is essential. Barnyard manure and commer- rigated, 11Ie nonirrigated; Loamy Plains range site.
<br />cial fertilizer are needed for top yields.
<br />Most nonirrigated areas are used for small
<br />rain
<br />The 41-Nunn clay loam, 0 to 1 percent slopes. This is a
<br />d
<br />ll
<br />g
<br />.
<br />soil is summer fallowed in alternate years. Winter wheat eep, we
<br />drained soil on terraces and smooth plains at
<br />elevations of 4,560 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 />
<br />wheat can be seeded. Generally precipitation is too low ,
<br />long and narrow areas of sand and gravel deposits and
<br />for beneficial use of fertilizer. small areas of soils that are subject to occasional flooding
<br />
<br />Such practices as stubble mulch farming, striperopping, .
<br />Some small leveled areas are also included
<br />
<br />and minimum tillage are needed to control soil blowing .
<br />Typically the surface layer of this Nunn soil is grayish
<br />and water erosion.
<br />The potential native vegetation is dominated b
<br />blue brown clay loam about 9 inches thick- The subsoil is light
<br />b
<br />y
<br />grama. Several mid grasses, such as western wheatgrass rownish gray clay loam about 14 inches thick. The upper
<br />part of the substratum is clay loam. The lower part to a
<br />and need leandthread, are also present. Potential produc- depth of 60 inches is sandy 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. As 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
<br />includ-
<br />Management of vegetation on this soil should be based ,
<br />ing corn, sugar beets, beans, alfalfa, small grain
<br />potatoes
<br />
<br />on taking half and leaving half of the total annual produc-
<br />tion
<br />Seedin
<br />is desirabl
<br />if th ,
<br />,
<br />and onions. An example of a suitable cropping system is 3
<br />.
<br />g
<br />e
<br />e range is in poor condition.
<br />Sideoats grama
<br />little bl
<br />t to 4 years of alfalfa followed by corn, corn for silage,
<br />,
<br />ues
<br />em, western wheatgrass, blue sugar beets, small grain, or beans. Few conservation prac-
<br />grama, pubescent wheatgrass, and crested wheatgrass are tices are needed to maintain top yields.
<br />suitable for seeding. The grass selected should meet the All methods of irrigation are suitable
<br />but furrow ir-
<br />seasonal requirements of livestock. It can be seeded into ,
<br />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 are generally well
<br />Windbreaks and environmental plantin
<br />s of trees and
<br />it
<br />d t
<br />thi
<br />il
<br />l
<br />g
<br />su
<br />e
<br />o
<br />s so
<br />. Cu
<br />tivation to control competing
<br />shrubs commonly grown in the area are 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 best suited and
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