|
WELD COUNTY, COLORADO; SOUTHERN PART ~ .. - ~., _29
<br />have good survival are Rocky Mountain juniper, eastern
<br />redcedaz, ponderosa pine, Siberian elm, Russian-alive, and
<br />~ -kberry. The shrubs best suited are skunkbush sumac,
<br />__ac, Siberian peashsub;`and American plum.
<br />_ Wildlife is an important secondary use of this soil. The.
<br />cropland areas provide favorable habitat for ring=necked
<br />pheasant and mourning dove. Many nongame species can
<br />be attracted by establishing areas for nesting and escape
<br />cover. For pheasants, undisturbed nesting cover is essen-
<br />tial and should be included in plans for. habitat develop-
<br />ment, especially in areas of intensive agriculture.
<br />This soil has fair to poor potential for urban develop-
<br />ment. It has moderate to high shrink swell, Igw strength,
<br />and moderately slaw permeability. These features create
<br />problems in dwelling and road construction. Those areas
<br />that have loam or sandy .loam in the lower part of the
<br />substratum aze suitable for septic tank absorption fields
<br />and foundations. Same areas of this soil are adjacent to
<br />streams and are subject to occasional flooding. The poten-
<br />tial is fair for such recreational development as camp and
<br />picnic areas and playgrounds. Capability thus I irri ted.
<br />42-Nunn clay oam, 1 to 3 percent slopes. This is a
<br />deep, well drained soil on terraces and smooth plains at
<br />elevations of 4,550 to 5,160 feet. It formed in mixed allu-
<br />vium and eolian deposits. Included in mapping are. small;
<br />long and narrow aeeas of sand and gravel-.deposits and
<br />small areas of soils that are subject to occasional flooding.
<br />Some leveled aeeas are also included.
<br />Typically the surface-layer of this Nunn soil is grayish
<br />Ewa clay loam aobut 9 inches thick. The subsoil is light
<br />.,:ownish gray clay loam about 14 inches thick. The upper
<br />part o£ the substratum, is light brownish gray-clay loam.
<br />The lower part to a depth of 60 inches is brown sandy
<br />loam. -
<br />Permeability is moderately slow. ASailable water
<br />capacity is high. The effective rooting depth is 60 inches
<br />or more. Surface runoff -is .medium, -and the erosion
<br />hazard is low.
<br />In irrigated aeeas this soil is: suited to all crops com-
<br />rrionly~ grown ,in the ~ area, including corn; sugar beets,
<br />beans,.alfalfa, small grain, potatoes, and onions. An exam-
<br />ple of a suitable cropping system is 3 to 4 years of alfalfa
<br />followed by corn, corti:for.silage, sugaz beets; small grain,
<br />or beans. Generally such characteristics as'the'high clay.
<br />content or the rapidly permeable substratum slightly
<br />restrictsome crops.
<br />All methods of irrigation are suitable, but furrow ir-
<br />rigation is the most common. Proper irrigation water
<br />management is essential. Barnyard manure' and commer-
<br />cial fertilizer are needed for top yields.
<br />In nonirrigated aeeas mast of the acreage is in small
<br />grain and it is summer followed in alternate years:
<br />Winter wheat is the principal crop. The predicted average
<br />yield is 33 bushels per acre. If the crop ig winterkilled~
<br />spring wheat can be seeded. Generally precipitation is too
<br />Inw for beneficial use of fertilizer..
<br />( nubble mulch farming, stripcropping, and. minimum til-
<br />.age are needed to control soil blowing and water erosion.
<br />The potential native vegetation is dominated by.
<br />western wheaEgrass and blue grams. Buffalograss is also
<br />present. Potential production ranges from 1,000 pounds
<br />per acre in favorable years to 600 pounds in unfavorable
<br />years. As range: condition deteriorates, a blue grams-buf-
<br />falograss sod forms. Undesirable weeds and annuals in=
<br />wade'the site as range condition becomes poorer.
<br />Management of-vegetation of this soil should be based
<br />on taking half and leaving half of the total annual produc-
<br />tion. Range pitting can help in reducing rnnoff. Seeding is
<br />desirable if the range is in poor condition. Western
<br />wheatgrass, blue grams, sideoats grams, buffalograss, pu-
<br />bescent wheatgrass, and crested wheatgrass are suitable
<br />for seeding. The grass selected should meet the seasonal
<br />requirements of livestock. It can be seeded into a clean,
<br />firm sorghum stubble; or it can be drilled, into a firm
<br />prepared seedbed. Seeding early in spring has proven
<br />most successful.
<br />Windbreaks and environmental plantings are generally
<br />well suited to this soil. Cultivation to control competing
<br />vegetation should be continued for as many years as
<br />possible following planting. Trees that are best suited and
<br />have-good survival are Rocky Mountain juniper, eastern
<br />redcedaz, ponderosa pine, Siberian elm,'Russian-olive; and
<br />hackberry. The shrubs best suited are skunkbush sumac,
<br />lilac, Siberian peashrnb, and American plum.
<br />Wildlife is an important secondary use of this soil. The
<br />cropland areas provide favorable habitat for Bing-necked
<br />pheasant and mourning dove. Marry nongame species can
<br />be attracted by establishing aeeas for nesting and escape
<br />cover. For pheasants; undisturbed nesting cover is essen-
<br />tial and should be included in plans far habitat develop-
<br />ment, especially in areas of intensive agriculture; Range-
<br />land wildlife, for example, the pronghorn antelope, can be.
<br />attracted by developing livestock watering facilities,
<br />~~managing livestock grazing, and reseeding where needed. ~~
<br />This soil has fair to poor potential for urban develop=
<br />ment. It has moderate to~high shrink swell,~~low strength,
<br />and .moderately slow permeability. These features create
<br />problems~in dwelling and road construction. Those areas
<br />that have loam or sandy -loam in the lower pazt of the
<br />substratum are suitable for septic tank absorption fields
<br />-and foundations. Some areas of this soil are adjacent to-
<br />streams and are subject to occasional flooding. The poten,
<br />tial~ is fair for such recreational development as camp and
<br />picnic areas and playgrounds. Capability subclass IIe.ir-
<br />riQated, IIIc nonirrigated; Clayey Plains range site. ..
<br />deep, well drained soil on terraces at elevations of 4,700.
<br />to 4,900 feet. It formed in alluvium along Box Elder
<br />Creek. Included in mapping are small areas of soils that
<br />have a loamy subsoil and small areas of soils that are sub-
<br />ject to rare flooding.
<br />Typically the surface layer of this Nunn soil is brown ~'"
<br />loamy. sand overburden about 9 inches thick. The subsoil .
<br />is dark to very dark grayish brown clay loam about 21
<br />inches thick..The substratum to a depth of. 60 inches is
<br />loamy very fine sand, loamy sand, or sand.
<br />
|