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This map is compiled on 1974 aerial F-- ti r---'
photography by the U.S. Department 5 000 4000 3 0G:
of Agriculture,Soil Conservation Service EXHIBIT
and cooperating agencies.
/02"
962275
28 SOIL SURVEY
40—Nunn loam, 1 to b vercent slopes. This is a deep, vegetation should be continued for as many ye;
well drained soil on terraces at elevations of 4,550 to 5,000 possible following planting. Trees that are best suit(
feet. It formed in mixed alluvium. Included in mapping have good survival are Rocky Mountain juniper, e
are small, long and narrow areas of sand and gravel redcedar, ponderosa pine, Siberian elm, Russian-olio
deposits and small areas of soils that are subject to occa- hackberry. The shrubs best suited are skunkbush
sional flooding. Some leveled areas are also included. lilac, Siberian peashrub, and American plum.
Typically the surface layer of this Nunn soil is grayish Wildlife is an important secondary use of this so
brown loam about 12 inches thick. The subsoil is light cropland areas provide favorable habitat for ring-i
brownish gray clay loam about 12 inches thick. The upper pheasant and mourning dove. Many nongame speci
part of the substratum is light brownish gray clay loam. be attracted by establishing areas for nesting and
The lower part to a depth of 60 inches is brown sandy cover. For pheasants, undisturbed nesting cover is
loam. tial and should be included in plans for habitat de
Permeability is moderately slow. Available water ment, especially in areas of intensive agriculture. I
capacity is high. The effective rooting depth is 60 inches land wildlife, for example, the pronghorn antelope,
or more. Surface runoff is medium, and the erosion attracted by developing livestock watering fac
hazard is low. managing livestock grazing, and reseeding where ne
In irrigated areas this soil is suited to all crops com- This soil has fair to poor potential for urban de
monly grown in the area, including corn, sugar beets, ment. It has moderate to high shrink swell, low str
beans, alfalfa, small grain, potatoes, and onions. An exam- and moderately slow permeability. These features
ple of a suitable cropping system is 3 to 4 years of alfalfa problems in dwelling and road construction. Those
followed by corn, corn for silage, sugar beets, small grain, that have loam or sandy loam in the lower part c
or beans. Generally such characteristics as a high clay substratum are suitable for septic tank absorption
content or a rapidly permeable substratum slightly and foundations. Some areas of this soil are adjac<
restrict some crops. . streams and are subject to occasional flooding. The I
All methods of irrigation are suitable, but furrow ir- tial is fair for such recreational development as cam
rigation is the most common. Proper irrigation water picnic areas and playgrounds. Capability subclass I
management is essential. Barnyard manure and commer- rigated, Inc nonirrigated; Loamy Plains range site.
cial fertilizer are needed for top yields. 41—Nunn clay loam, 0 to 1 percent slopes. Thi.
Most nonirrigated areas are used for small grain. The deep, well drained soil on terraces and smooth plai
soil is summer fallowed in alternate years. Winter wheat elevations of 4,550 to 5,150 feet. It formed in mixed
is the principal crop. If the crop is winterkilled, spring vium and eolian deposits. Included in mapping are
wheat can be seeded. Generally precipitation is too low long and narrow areas of sand and gravel deposit:
for beneficial use of fertilizer. small areas of soils that are subject to occasional floc
Such practices as stubble mulch farming, striperopping, Some small leveled areas are also included.
and minimum tillage are needed to control soil blowing Typically the surface layer of this Nunn soil is gr
and water erosion. brown clay loam about 9 inches thick. The subsoil is
The potential native vegetation is dominated by blue brownish gray clay loam about 14 inches thick. The L
grama. Several mid grasses, such as western wheatgrass part of the substratum is clay loam. The lower part
and needleandthread, are also present. Potential produc- depth of 60 inches is sandy loam.
tion ranges from 1,600 pounds per acre in favorable years Permeability is moderately slow. Available v
to 1,000 pounds in unfavorable years. As range condition capacity is high. The effective rooting depth is 60 ir
deteriorates, the mid grasses decrease; blue grama, bur- or more. Surface runoff is slow, and the erosion haza
falograss, snakeweed, yucca, and fringed sage increase; low.
and forage production drops. Undesirable weeds and an- This soil is used almost entirely for irrigated crol
nuals invade the site as range condition becomes poorer. is suited to all crops commonly grown in the area, in(
Management of vegetation on this soil should be based ing corn, sugar beets, beans, alfalfa, small grain, pota
on taking half and leaving half of the total annual produc- and onions. An example of a suitable cropping system
tion. Seeding is desirable if the range is in poor condition. to 4 years of alfalfa followed by corn, corn for si
Sideoats grama, little bluestem, western wheatgrass, blue sugar beets, small grain, or beans. Few conservation
grama, pubescent wheatgrass, and crested wheatgrass are tices are needed to maintain top yields.
suitable for seeding. The grass selected should meet the All methods of irrigation are suitable, but furrov
seasonal requirements of livestock. It can be seeded into rigation is the most common. Barnyard manure and c
a clean, firm sorghum stubble, or it can be drilled into a mercial fertilizer are needed for top yields.
firm prepared seedbed. Seeding early in spring_ has Windbreaks and environmental plantings of trees
proven most successful. shrubs commonly grown in the area are generally
Windbreaks and environmental plantings of trees and suited to this soil. Cultivation to control conipe
shrubs commonly grown in the area are generally well vegetation should be continued for as many year:
suited to this soil. Cultivation to control competing possible following planting. Trees that are best suited
962275
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