HomeMy WebLinkAbout20081784.tiff 52 SOIL SURVEY
the limited capacity of this soil to support a load. Capa- Management of vegetation on this soil should be b:
• bility class I irrigated. on taking half and leaving half of the total annual prop
82—Wiley-Colby complex, 1 to 3 percent slopes. This tion. Seeding is desirable if the range is in poor condil
nearly level map unit is on smooth plains in the western Sideoats grams, little bluestem, western wheatgrass, 1
part of the survey area at elevations of 4,850 to 5,000 grams, pubescent wheatgrass, and crested wheatgrass
feet. The Wiley soil makes up about 60 percent of the suitable for seeding. The grass selected should meet
unit, and the Colby soil about 30 percent. About 10 per- seasonal requirements of livestock. It can be seeded
cent is Heldt silty clay and Weld loam. a clean, firm sorghum stubble or it can be drilled in
The Wiley soil is deep and well drained. It formed in firm prepared seedbed. Seeding early in spring
calcareous eolian deposits. Typically the surface layer is proven most successful.
pale brown silt loam about 11 inches thick. The subsoil is Windbreaks and environmental plantings are gene,
pale brown silty clay loam about 23 inches thick. The sub- well suited to these soils. Cultivation to control compe
stratum to a depth of 60 inches is very pale brown silty vegetation should be continued for as many years
clay loam. possible following planting. Trees that are best suited
Permeability is moderately slow. Available water have good survival are Rocky Mountain juniper, ease
capacity is high. The effective rooting depth is 60 inches redcedar, ponderosa pine, Siberian elm, Russian-olive,
or more. Surface runoff is medium, and the erosion hackberry. The shrubs best suited are skunkbush sw
hazard is moderate. lilac, Siberian peashrub, and American plum.
The Colby soil also is deep and well drained and formed Openland wildlife, such as pheasant, mourning d
in calcareous eolian deposits. Typically the surface layer and cottontail are best suited to these soils. Wilc
is pale brown loam about 7 inches thick. The underlying habitat development, including tree and shrub plant;
material is very pale brown silt loam to a depth of 60 and grass plantings to serve as nesting areas, should
inches. successful without irrigation during most years. Under
Permeability is moderate. Available water capacity is rigation, good wildlife habitat can be established, ben(
high. The effective rooting depth is 60 inches or more. ing many kinds of openland wildlife.
Surface runoff is medium, and the erosion hazard is The Wiley soil has only fair potential for urban
moderate. recreational development. Slow permeability, mode;
This map unit is used for irrigated and nonirrigated shrink-swell potential, and limited bearing capacity ca
• cropland and for rangeland, wildlife habitat, and urban problems in dwelling and road construction. The C<
development. soil has good potential for urban and recreational deve.
In irrigated areas these soils are suited to all crops ment. Road design can be modified to compensate for
commonly grown in the area, including corn, sugar beets, limited capacity of this soil to support a load. Capabi
beans, alfalfa, small grain, and onions. An example of a subclass Ile irrigated, IVe nonirrigated; Loamy Ph
suitable cropping system is 3 to 4 years of alfalfa fol- range site.
lowed by corn, corn for silage, sugar beets, small grain, or 83—Wiley-Colby complex, 3 to 5 percent slopes. 7
beans. Land leveling, ditch lining, and installing pipelines gently sloping map unit is on plains at elevations of 4,
may be needed for proper water applications. to 5,000 feet. The Wiley soil makes up about 60 percen
All methods of irrigation are suitable, but furrow ir- the unit, and the Colby soil about 30 percent. About
rigation is the most common. Barnyard.manure and com- percent is Heldt silty clay and Weld loam.
mercial fertilizer are needed for top yields. The Wiley soil is deep and well drained. It formed
In nonirrigated areas these soils are suited to winter calcareous eolian deposits. Typically the surface layer
wheat, barley, and sorghum. Most of the acreage is pale brown silt loam about 11 inches thick. The subsoi
planted to winter wheat. The predicted average yield is pale brown silty clay loam about 23 inches thick. The s
28 bushels per acre. The soil is summer fallowed in al- stratum to a depth of 60 inches is very pale brown s
ternate years to allow moisture accumulation. Generally clay loam.
precipitation is too low for beneficial use of fertilizer. Permeability is moderately slow. Available wa
Stubble mulch farming, striperopping, and minimum til- capacity is high. The effective rooting depth is 60 inc.
lage are needed to control soil blowing and water erosion. or more. Surface runoff is medium to rapid, and the e
Terracing also may be needed to control water erosion. sion hazard is moderate.
The potential native vegetation is dominated by blue The Colby soil also is deep and well drained and forn
grams. Several mid grasses such as western wheatgrass in calcareous eolian deposits. Typically the surface la,
and needleandthread are also present. Potential produc- is pale brown loam about 7 inches thick. The underly
tion ranges from 1,600 pounds per acre in favorable years material is very pale brown silt loam to a depth of
to 1,000 pounds in unfavorable years. As range condition inches.
deteriorates, the mid grasses decrease; blue grama, buf- Permeability is moderate. Available water capacity
falograss, snakeweed, yucca and fringed sage increase; high. The effective rooting depth is 60 inches or me
• and forage production drops. Undesirable weeds and an- Surface runoff is medium to rapid, and the erosion hazy
nuals invade the site as range condition becomes poorer. is moderate.
EXHIBIT
2008-1784 I /0
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U.S. Department of Agriculture 79 •
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SOIL SURVEY MAP ' s2
Weld County, Colorado— Southern Part 42
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)` f 3 ' p',• Application for Use By Special Review
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aiii '' . x : Weld County, Colorado
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