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2004-2765
WELD COUNTY, COLORADO, SOUTHERN PART 41
The potential native vegetation on this range site is This soil is suited to limited cropping. Intensive
dominated by sand bluestem, sand reedgrass, and blue cropping is hazardous because of erosion. The cropping
na. Needleandthread, switchgrass, sideoats grama, system should be limited to such close grown crops as al-
western wheatgrass are also prominent. Potential falfa, wheat, and barley. The soil is also suited to ir-
production ranges from 2,200 pounds per acre in favora- rigated pasture. A suitable cropping system is 3 to 4
ble years to 1,800 pounds in unfavorable years. As range years of alfalfa followed by 2 years of corn and small
condition deteriorates, the sand bluestem, sand reedgrass, grain and alfalfa seeded with a nurse crop.
and switchgrass decrease and blue grama, sand dropseed, Closely spaced contour ditches or sprinklers can be
and sand sage increase. Annual weeds and grasses invade used in irrigating close grown crops. Contour furrows or
the site as range condition becomes poorer. sprinklers should be used for new crops. Applications of
Management of vegetation on this soil should be based nitrogen and phosphorus help in maintaining good produc-
on taking half and leaving half of the total annual produc- tion.
tion. Seeding is desirable if the range is in poor condition. The potential native vegetation on this range site is
Sand bluestem, sand reedgrass, switchgrass, sideoats dominated by sand bluestem, sand reedgrass, and blue
grama, blue grama, pubescent wheatgrass, and crested grama. Needleandthread, switchgrass, sideoats grama,
wheatgrass are suitable for seeding. The grass selected and western wheatgrass are also prominent. Potential
should meet the seasonal requirements of livestock. It can production ranges from 2,200 pounds per acre in favora-
be seeded into a clean, firm sorghum stubble or it can be ble years to 1,800 pounds in unfavorable years. As range
drilled into a firm prepared seedbed. Seeding early in condition deteriorates, the sand bluestem, sand reedgrass,
spring has proven most successful. and switchgrass decrease and blue grama, sand dropseed,
Windbreaks and environmental plantings are generally and sand sage increase. Annual weeds and grasses invade
not suited to this soil. Onsite investigation is needed to the site as range condition becomes poorer.
determine if plantings are feasible. Management of vegetation on this soil should be based
Wildlife is an important secondary use of this soil. The on taking half and leaving half of the total annual produc-
cropland areas provide favorable habitat for ring-necked tion. Seeding is desirable if the range is in poor condition.
pheasant and mourning dove. Many nongame species can Sand bluestem, sand reedgrass, switchgrass, sideoats
be attracted by establishing areas for nesting and escape grama, blue grama, pubescent wheatgrass, and crested
cover. For pheasants, undisturbed nesting cover is essen- wheatgrass are suitable for seeding. The grass selected
tial and should be included in plans for habitat develop- should meet the seasonal requirements of livestock. It can
especially in areas of intensive agriculture. Range- be seeded into a clean, firm sorghum stubble, or it can be
id wildlife, for example, the pronghorn antelope, can be drilled into a firm prepared seedbed. Seeding early in
attracted by developing livestock watering facilities, spring has proven most successful.
managing livestock grazing, and reseeding where needed. Windbreaks and environmental plantings are generally
The underlying sandstone is the most limiting feature not suited to this soil. Onsite investigation is needed to
of this soil. Neither septic tank absorption fields nor determine if plantings are feasible.
sewage lagoons function properly. Site preparation for Wildlife is an important secondary use of this soil. The
dwellings is costly. Enviornmental and beautification cropland areas provide favorable habitat for ring-necked
plantings of trees and shrubs can be difficult to establish. pheasant and mourning dove. Many nongame species can
Potential is good, however, for such recreational develop- be attracted by establishing areas for nesting and escape
ment as camp and picnic areas and playgrounds. Capabili- cover. For pheasants, undisturbed nesting cover is essen-
ty subclass IVe irrigated, IVe nonirrigated; Sandy Plains tial and should be included in plans for habitat develop-
range site. ment, especially,,in areas of intensive agriculture. Range-
63—Terry fine sandy loam, 3 to 9 percent slopes. This land wildlife, for example, the pronghorn antelope, can be
is a moderately deep, well drained soil on plains at eleva- attracted by developing livestock watering facilities,
tions of 4,500 to 5,000 feet. It formed in residuum from managing livestock grazing, and reseeding where needed.
sandstone. Included in mapping are small areas of soils The underlying sandstone is the most limiting feature
that have sandstone deeper than 40 inches. Also included of this soil. Neither septic tank absorption fields nor
are small areas of soils that have a sandy clay loam and sewage lagoons function properly. Site preparation for
clay loam subsoil. dwellings is costly. Environmental and beautification
Typically the surface layer of this Terry soil is pale plantings of trees and shrubs can be difficult to establish.
brown fine sandy loam about 6 inches thick. The subsoil is Potential is good, however, for such recreational develop-
pale brown fine sandy loam about 18 inches thick. The ment as camp and picnic areas. Capability subclass IVe ir-
substratum is fine sandy loam. Sandstone is at a depth of rigated, VIe nonirrigated; Sandy Plains range site.
about 32 inches. 64—Thedalund loam, 1 to 3 percent slopes. This is a
Permeability is moderately rapid. Available water moderately deep, well drained soil on plains at elevations
capacity is moderate. The effective rooting depth is 20 to of 4,900 to 5,250 feet. It formed in residuum from shale.
40 inches. Surface runoff is medium to rapid, and the ero- Included in mapping are small areas of soils that have
lion hazard is moderate. shale and sandstone deeper than 40 inches.
42 SOIL SURVEY
Typically the surface layer is brown loam about 8 The underlying shale is the most limiting feature of
,..--inches thick. The underlying material is pale brown and this soil. Neither septic tank absorption fields nor sewage
ery pale brown loam. Shale is at a depth of about 28 lagoons function properly. In places the underlying shale
inches. has high shrink-swell potential. Environmental and beau-
Permeability and available water capacity are tification plantings of trees and shrubs can be difficult to
moderate. The effective rooting depth is 20 to 40 inches. establish. Capability subclass IVs irrigated; IVe nonir-
Surface runoff is medium, and the erosion hazard is low. rigated; Loamy Plains range site.
This soil is suited to limited cropping. A suitable 65—Thedalund loam, 3 to 9 percent slopes. This is a
cropping system is 3 to 4 years of alfalfa followed by 2 moderately deep, well drained soil on plains at elevations
years of corn and small grain and alfalfa seeded with a of 4,900 to 5,250 feet. It formed in residuum from shale.
nurse crop. Incorporating plant residue and manure im- Included in mapping are small areas of soils that have
proves tilth and provides organic matter and plant shale and sandstone deeper than 40 inches. Some small
nutrients. outcrops of shale and sandstone are also included.
Most irrigation methods are suitable, but the length of Typically the surface layer of this Thedalund soil is
runs should be short to prevent overirrigation. Light, brown loam about 8 inches thick. The underlying material
frequent irrigations are best. Sprinkler irrigation is . is pale brown and very pale brown loam. Shale is at a
desirable. Commercial fertilizers increase yields and add depth of about 25 inches.
to the value of the forage produced. Permeability and available water capacity are
In nonirrigated areas this soil is suited to winter wheat, moderate. The effective rooting depth is 20 to 40 inches.
Surface runoff is medium to rapid, and the erosion hazard
barley, and sorghum. Most of the acreage is planted to
winter wheat. The predicted average yield is 25 bushels is moderate.
per acre. The soil is summer fallowed in alternate years This soil is suited to limited cropping. Intensive
to allow moisture accumulation. Generally precipitation is cropping is hazardous because of erosion. The cropping
too low for beneficial use of fertilizer. system should be limited to such close grown crops as al-
Stubble mulch farming, striperopping, and minimum til- falfa, wheat, and barley. The soil is also suited to it
lage are needed to control soil blowing and water erosion. rigated pasture. A suitable cropping system is 3 to 4
Ten-acing also may be needed to control water erosion. Years of alfalfa followed by 2 years of corn and small
The potential native vegetation is dominated by blue grain and alfalfa seeded with a nurse crop.
ama. Several mid Closely spaced contour ditches or sprinklers can be
�.ZI' grasses, such as western wheatgrass used in irrigating close grown crops. Contour furrows or
�d needleandthread, are also present. Potential produc- sprinklers should be used for new crops. Application of
tion ranges from 1,600 pounds per acre in favorable years commercial fertilizer helps in maintaining good produc-
to 1,000 pounds in unfavorable years. As range condition tion.
deteriorates, the mid grasses decrease; blue grama, buf- The potential native vegetation is dominated by blue
falograss, snakeweed, yucca, and fringed sage increase; grama. Several mid grasses, such as western wheatgrass
and forage production drops. Undesirable weeds and an- and needleandthread, are also present. Potential produz-
nuals invade the site as range condition becomes poorer. tion ranges from 1,600 pounds per acre in favorable years
Management of vegetation on this soil should be based to 1,000 pounds in unfavorable years. As range condition
on taking half and leaving half of the total annual produc- deteriorates, the mid grasses decrease; blue grama, buf
tion. Seeding is desirable if the range is in poor condition. falograss, snakeweed, yucca, and fringed sage increase;
Sideoats grama, little bluestem, western wheatgrass, blue and forage production drops. Undesirable weeds and an-
grama, pubescent wheatgrass, and crested wheatgrass are nuals invade the site as range condition becomes poorer.
suitable for seeding. The grass selected should meet the Management of vegetation on this soil should be based
seasonal requirements of livestock. It can be seeded into on taking half and leaving half of the total annual produc-
a clean, firm sorghum stubble, or it can be drilled into a tion. Seeding is desirable if the range is in poor condition.
firm prepared seedbed. Seeding early in spring has Sideoats grama, little bluestem, western wheatgrass, blue
proven most successful. grama, pubescent wheatgrass, and crested wheatgrass are
Windbreaks and environmental plantings are generally suitable for seeding. The grass selected should meet the
not suited to this soil. Onsite investigation is needed to seasonal requirements of livestock. It can be seeded into
determine if plantings are feasible. a clean, firm sorghum stubble, or it can be drilled into a
Rangeland wildlife, such as antelope, cottontail, and firm prepared seedbed. Seeding early in spring has
coyote, are best suited to this soil. Because forage produc- proven most successful.
tion is typically low, grazing management is needed if Windbreaks and environmental plantings are generally
livestock and wildlife share the range. Livestock watering not suited to this soil. Onsite investigation is needed to
facilities also are utilized by various wildlife species. The determine if plantings are feasible.
cropland areas provide favorable habitat for pheasant and Rangeland wildlife, such as antelope, cottontail, and
.—ourning dove. Many nongame species can be attracted coyote, are best suited to this soil. Because forage produc-
establishing areas for nesting and escape cover. tion is typically low, grazing management is needed if
r
WELD COUNTY, COLORADO, SOUTHERN PART 43
livestock and wildlife share the range. Livestock watering ing. The grass selected should meet the seasonal require-
facilities also are utilized by various wildlife species. The ments of livestock. It can be seeded into a clean, firm
'" cropland areas provide favorable habitat for pheasant and sorghum stubble, or it can be drilled into a firm prepared
mourning dove. Many nongame species can be attracted seedbed. Seeding early in spring has proven most success-
by establishing areas for nesting and escape cover. ful.
The underlying shale is the most limiting feature of Windbreaks and environmental plantings of trees and
this soil. Neither septic tank absorption fields nor sewage shrubs commmonly grown in the area are generally well
lagoons function properly. In places the underlying shale suited to this soil. Cultivation to control competing
has high shrink-swell potential. Environmental and beau- vegetation should be continued for as many years as
tification plantings of trees and shrubs can be difficult to possible following planting. Trees that are best suited and
establish. Capability subclass IVe irrigated, VIe nonir- have good survival are Rocky Mountain juniper, eastern
rigated; Loamy Plains range site. redcedar, ponderosa pine, Siberian elm, Russian-olive, and
66—Ulm clay loam, 0 to 3 percent slopes. This is a hackberry. The shrubs best suited are skunkbush sumac,
deep, well drained soil on plains at elevations of 5,075 to lilac, Siberian peashrub, and American plum.
5,200 feet. It formed in alluvial and eolian sediments from Wildlife is an important secondary use of this soil. The
shale. Included in mapping are small areas of soils that cropland areas provide favorable habitat for ring-necked
have shale between 40 and 60 inches. Also included are pheasant and mourning dove. Many nongame species can
small areas of soils where the surface layer and subsoil be attracted by establishing areas for nesting and escape
have been recharged with lime from irrigation. cover. For pheasants, undisturbed nesting cover is essen-
Typically the surface layer of this Ulm soil is brown tial and should be included in plans for habitat develop-
clay loam about 5 inches thick. The subsoil is brown and ment, especially in areas of intensive agriculture. Range-
pale brown clay about 14 inches thick. The substratum to land wildlife, for example, the pronghorn antelope, can be
a depth of 60 inches is clay and clay loam. attracted by developing livestock watering facilities,
Permeability is slow. Available water capacity is high. managing livestock grazing, and reseeding where needed.
The effective rooting depth is 60 inches or more. Surface This soil has poor potential for urban and recreational
runoff is medium,and the erosion hazard is low. development. Slow permeability and high shrink swell
In irrigated areas this soil is suited to all crops com- cause problems in dwelling and road construction. Capa-
monly grown in the area, including corn, sugar beets, bility subclass Ile irrigated, IVe nonirrigated; Clayey
beans, alfalfa, and small grain. An example of a suitable Plains range site.
cropping system is 3 to 4 years of alfalfa followed by 67—Ulm clay loam, 3 to 5 percent slopes. This is a
corn, corn for silage, sugar beets, small grain, or beans. deep, well drained soil on plains at elevations of 5,075 to
Land leveling, ditch lining, and installing pipelines are 5,200 feet. It formed in alluvial and eolian sediments from
needed for proper water applications. shale. Included in mapping are small areas of soils that
All methods of irrigation are suitable, but furrow ir- have shale between depths of 40 and 60 inches. Also in-
rigation is the most common. Barnyard manure and com- eluded are small areas of soils where the surface layer
mercial fertilizer are needed for top yields. and subsoil have been recharged with lime from irriga-
In nonirrigated areas this soil is suited to winter wheat, tion.
barley, and sorghum. Most of the acreage is planted to Typically the surface of this Ulm soil is brown clay
winter wheat. The predicted average yield is 28 bushels loam about 5 inches thick. The subsoil is brown and pale
per acre. The soil is summer fallowed in alternate years brown clay about 12 inches thick. The substratum to a
to allow moisture accumulation. Generally precipitation is depth of 60 inches is clay and clay loam.
too low for beneficial use of fertilizer. Permeability is slow. Available water capacity is high.
Stubble mulch farming, striperopping, and minimum til- The effective rooting depth is 60 inches or more. Surface
lage are needed to control soil blowing and water erosion. runoff is medium, and the erosion hazard is moderate.
Terracing also may be needed to control water erosion. In irrigated areas this soil is suited to the crops com-
The potential native vegetation is dominated by monly grown in the area. Perennial grasses and alfalfa or
western wheatgrass and blue grama. Buffalograss is also close grown crops should be grown at least 50 percent of
present. Potential production ranges from 1,000 pounds the time. Contour ditches and corrugations can be used in
per acre in favorable years to 600 pounds in unfavorable irrigating close grown crops and pasture. Furrows, con-
years. As range condition deteriorates, a blue grama-buf- tour furrows, and cross slope furrows are suitable for row
falograss sod forms. Undesirable weeds and annuals in- crops. Sprinkler irrigation is also desirable. Keeping til-
vade the site as range condition becomes poorer. lage to a minimum and utilizing crop residue help to con-
Management of vegetation on this soil should be based trol erosion. Maintaining fertility is important. Crops
on taking half and leaving half of the total annual produc- respond to applications of phosphorus and nitrogen.
tion. Range pitting can reduce runoff. Seeding is desirable In nonirrigated areas this soil is suited to winter wheat,
if the range is in poor condition. Western wheatgrass, barley, and sorghum. Most of the acreage is planted to
blue grama, sideoats grama, buffalograss, pubescent winter wheat. The predicted average yield is 28 bushels
wheatgrass, and crested wheatgrass are suitable for seed- per acre. The soil is summer fallowed in alternate years
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