HomeMy WebLinkAbout961969.tiff WELD COUNTY, COLORADO, SOUTHERN PART 29
`•`- have good survival are Rocky Mountain juniper, eastern The potential native vegetation is dominated by
redcedar, ponderosa pine, Siberian elm, Russian-olive, and western wheatgrass and blue grama. Buffalograss is also
hackberry. The shrubs best suited are skunkbush sumac, present. Potential production ranges from 1,000 pounds
lilac,Siberian peashrub, and American plum. per acre in favorable years to 600 pounds in unfavorable
Wildlife is an important secondary use of this soil. The years. As range condition deteriorates, a blue grama-buf-
cropland areas provide favorable habitat for ring-necked falograss sod forms. Undesirable weeds and annuals in-
pheasant and mourning dove. Many nongame species can vade the site as range condition becomes poorer.
be attracted by establishing areas for nesting and escape Management of vegetation of this soil should be based
cover. For pheasants, undisturbed nesting cover is essen- on taking half and leaving half of the total annual produc-
tial and should be included in plans for habitat develop- tion. Range pitting can help in reducing runoff. Seeding is
ment,especially in areas of intensive agriculture. desirable if the range is in
This soil has fair topoor g poor condition. Western
potential for urban develop- wheatgrass, blue grama, sideoats grama, buffalograss, pu-
ment. It has moderate to high shrink swell, low strength, bescent wheatgrass, and crested wheatgrass are suitable
and moderately slow permeability. These features create for seeding. The grass selected should meet the seasonal
problems in dwelling and road construction. Those areas requirements of livestock. It can he seeded into a clean,
that have loam or sandy loam in the lower part of the firm sorghum stubble, or it can be drilled into a firm
substratum are suitable for septic tank absorption fields prepared seedbed. Seeding early in spring has proven
and foundations. Some areas of this soil are adjacent to most successful.
streams and are subject to occasional flooding. The paten- Windbreaks and environmental plantings are generally
tial is fair for such recreational development as camp and well suited to this soil. Cultivation to control competing
picnic areas and playgrounds. Capability class I irrigated. vegetation should be continued for as many years as
42—Nunn clay loam, 1 to 3 percent slopes. This is a possible following planting. Trees that are best suited and
deep, well drained soil on terraces and smooth plains at have good survival are Rocky Mountain juniper, eastern
elevations of 4,550 to 5,150 feet. It formed in mixed allu- redcedar, ponderosa pine, Siberian elm, Russian-olive, and
vium and eolian deposits. Included in mapping are small, hackberry. The shrubs best suited are skunkbush sumac,
long and narrow areas of sand and gravel deposits and lilac, Siberian peashrub, and American plum.
small areas of soils that are subject to occasional flooding. Wildlife is an important secondary use of this soil. The
Some leveled areas are also included. cropland areas provide favorable habitat for ring-necked
Typically the surface layer of this Nunn soil is grayish pheasant and mourning dove. Many nongame species can
brown clay loam aobut 9 inches thick. The subsoil is light be attracted by establishing areas for nesting and escape
brownish gray clay loam about 14 inches thick. The upper cover. For pheasants, undisturbed nesting cover is essen-
part of the substratum is light brownish gray clay loam. tial and should be included in plans for habitat develop-
The lower part to a depth of 60 inches is brown sandy ment, especially in areas of intensive agriculture. Range-
loam. land wildlife, for example, the
Permeability is moderately slow. Available water p pronghorn antelope, can be
attracted by developing livestock watering facilities,
capacity is high. The effective rooting depth is 60 inches managing livestock grazing, and reseeding where needed.
or more. Surface runoff is medium, and the erosion This soil has fair to poor potential for urban develop-
hazard is low. ment. It has moderate to high shrink swell, low strength,
In irrigated areas this soil is suited to all crops com- and moderately slow permeability. These features create
manly grown in the area, including corn, sugar beets, problems in dwelling and road construction. Those areas
beans, alfalfa, small grain, potatoes, and onions. An exam- that have loam or sandy loam in the lower part of the
ple of a suitable cropping system is 3 to 4 years of alfalfa substratum are suitable for septic tank absorption fields
followed by corn, corn for silage, sugar beets, small grain, and foundations. Some areas of this soil are adjacent to
or beans. Generally such characteristics as the high clay streams and are subject to occasional flooding. The poten-
content or the rapidly permeable substratum slightly tial is fair for such recreational development as camp and
restrict some crops. picnic areas and playgrounds. Capability subclass Ile ir-
All methods of irrigation are suitable, but furrow ir- rigated, life nonirrigated; Clayey Plains range site.
rigation is the most common. Proper irrigation water 43—Nunn loamy sand, 0 to 1 percent slopes. This is a
management is essential. Barnyard manure and commer- deep, well drained soil on terraces at elevations of 4,700
cial fertilizer are needed for top yields. to 4,900 feet. It formed in alluvium along Box Elder
In nonirrigated areas most of the acreage is in small Creek. Included in mapping are small areas of soils that
grain and it is summer fallowed in alternate years. have a loamy subsoil and small areas of soils that are sub-
Winter wheat is the principal crop. The predicted average ject to rare flooding.
yield is 33 bushels per acre. If the crop is winterkilled, Typically the surface layer of this Nunn soil is brown
spring wheat can be seeded. Generally precipitation is too loamy sand overburden about 9 inches thick. The subsoil
low for beneficial use of fertilizer. is dark to very dark grayish brown clay loam about 21
Stubble mulch farming, striperopping, and minimum til- inches thick. The substratum to a depth of 60 inches is
lage are needed to control soil blowing and water erosion. loamy very fine sand, loamy sand, or s•. ..
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961969
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