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WELD COUNTY, CO
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2001-0514
EXHIBIT
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•28 SOIL SURVEY �.,. t �,b
�40nn loam, 1 to 3 percent slopes. This is a deep, vegetation should be continued for as many i - �" s
welLdrained soil on terraces at elevations of 4,550 to 5,000 possible following planting. Trees that are beg �^ ��'
.eet. It formed in mixed alluvium. Included in mapping have �� ,,
pp g good survival are Rocky Mountain •rc1� rte,
are small, long and narrow areas of sand and gravel redcedar, ponderosa pine, Siberian elm, Russian-4 _ �
deposits and small areas of soils that are subject to occa- hackberry. The shrubs best suited are skunkbus4. ..
siona m l flooding. Some leveled -eas are also included. lilac, Siberian peashrub, and American plum, ' xf,.*r"`
Typically the surface layer of this Nunn soil is grayish Wildlife is an important secondary use of this "'- ." �'s ,
brown loam about 12 inches thick. The subsoil is light cropland areas provide favorable habitat for nngtia '*%
brownish gray clay loam about 12 inches thick. The upper pheasant and mourning dove. Many nongame spee3 �" •
part of the substratum is light brownish gray clay loam. be attracted by establishing areas for nesting and 4 '\ '
The lower part to a depth of 60 inches is brown sandy cover. For pheasants, undisturbed nesting cover is a
loam. tial and should be included in plans for habitat der i wsS4
Permeability is moderately slow. Available water ment, especially in areas of intensive agriculture. ")"""
capacity is high. The effective rooting depth is 60 inches land wildlife, for example, the pronghorn antelope,an ��" ;
or more. Surface runoff is medium, and the erosion attracted by developing livestock watering faci$Ya4 * '.',
hazard is low. managing livestock grazing, and reseeding where necvr -1
In irrigated areas this soil is suited to all crops corn- This soil has fair to poor potential for urban devtk ,"
monly grown in the area, including corn, sugar beets, ment. It has moderate to high shrink swell, low strerr.
•
beans, alfalfa, small grain, potatoes, and onions. An exam- and moderately slow permeability. These features creme::s ,-`,#t
pie of a suitable cropping system is 3 to 4 years of alfalfa problems in dwelling and road construction. Those argt
followed by corn, corn for silage, sugar beets, small grain, that have loam or sandy loam in the lower part of `1x;;
or beans. Generally such characteristics as a high clay substratum are suitable for septic absorption eke tic tank fi c
content or a rapidly permeable substratum slightly and foundations. Some areas of this soil are adjacent to Y. 'e
restrict some crops. streams and are subject to occasional flooding. The poten . . .
All methods of irrigation are suitable, but furrow ir- tial is fair for such recreational development as camp and'.'-" 4
rigation is the most common. Proper irrigation waterpicnic areas and playgrounds. "
Capability subclass Ile it-� '�. L` �,
management is essential. Barnyard manure and commer- rigated, IIIc nonirrigated; Loamy Plains range site. .'�
cial fertilizer are needed for top yields. -- - . - • • m• . .
_ Most nonirr"igated areas are used for small grain. The
iii is summer fallowed in alternate years. Winter wheat
is the principal crop. If the crop is winterkilled, spring
wheat can be seeded. Generally precipitation is too low
for beneficial use of fertilizer.
Such practices as stubble mulch farming, striperopping,
and minimum tillage are needed to control soil blowing 87— Im clay loam. to 5 oercent slopes. This is a
to
and water erosion.
The potential native vegetation is dominated by blue eep, well drained soil on p[ams n sediments of fr,075om
m
grama. Several mid grasses, such as western wheatgrass sh5,200 feet. It formed in alluvial and eolian from
and needleandthread, are also present. Potential produc- have Included alet in mapping are andll areas of soils that
shale between depths of 40 and 60 inches. Also in-
lion ranges from 1,600 pounds per acre in favorable years eluded are small areas of soils where the surface layer
to 1,000 pounds in unfavorable years. As range condition
and subsoil have been recharged with lime from imga-
deteriorates, the mid grasses decrease; blue grama, buf- tion.
falograss, snakeweed, yucca, and fringed sage increase;
Typically the surface of this Ulm soil is brown clay
and forage production drops. Undesirable weeds and an- loam about 5 inches thick. The subsoil is brown and pale
nuals invade the site as range condition becomes poorer. brown clay about 12 inches thick. The substratum to a
Management of vegetation on this soil should be based depth of 60 inches is clay and clay loam.
on taking half and leaving half of the total annual produc- Permeability is slow. Available water capacity is high.
tion. Seeding is desirable if the range is in poor condition. The effective rooting depth is 60 inches or more. Surface
Sideoats grama, little bluestem, western wheatgrass, blue
grama, pubescent wheatgrass, and crested wheatgrass are runoff Ii is i medium, and the erosion edrd is m cropse.
In irrigated areas this soil is suited to the crops com-
suitable for seeding. The grass selected should meet the monly grown in the area. Perennial grasses and alfalfa or
seasonal requirements of livestock. It can be seeded into close grown crops should be grown at least 50 percent of
a clean, firm sorghum stubble, or it can be drilled into abe
firm prepared seedbed. Seeding early in spring has the time. Contour ditches and corrugations can ro used con-
proven most successful. irrigating close grown crops and pasture. Furrows,environmental plantings of trees and tour furrows, and cross slope furrows are suitable for row
Windbreaks commonlyand grown in the t area are generally fe andll crops. Sprinkler irrigation is also desirable. Keeping til-
lage to a minimum and utilizing crop residue help to con-
Ailed to this soil. Cultivation to control competing trol erosion. Maintaining fertility is important. Crops
respond to applications of phosphorus and nitrogen.
In nonirrigated areas this soil is suited to winter wheat,
barley, and sorghum. Most of the acreage is planted to
winter wheat. The predicted average yield is 28 bushels
per acre. The soil is summer fallowed in alternate years
v.r.LD COUNTY, COLORADO, SOUTHERN PART 0
Soil Surveil
7,0/Aquolls and Aquepts, flooded. This nearlys<lev`;
Yunit is in depressions in smooth plains and alonghe
bottoms of natural drainageways throughout.thetsuiyej
area. Aquolls, which have a dark colored surface.;Jay`er,
make up about 55 percent of the unit. Aqueptsjwhia.
have a lighter colored surface layer, make up abou
percent. About 20 percent is soils that are well'di '
and soils that have sandstone or shale within 48`iiie '.
the surface.
These are deep, poorly drained soils that formed in
recent alluvium. No one pedon is typical. Commonly the
soils have a mottled, mildly to moderately alkaline loamy
or clayey surface layer and underlying material that ex-
tends to a depth of 60 inches or more. In places they have
a gleyed layer in the underlying material.
Most of the acreage is subject to excessive runoff. The
water table is at or near the surface in spring and during
the peak of the irrigation season.
These soils are used for rangeland and wildlife habitat.
Some small areas are irrigated pasture.
The potential native vegetation is dominated by
switchgrass, prairie cordgrass, saltgrass, alkali sacaton,
big bluestem„ indiangrass, western wheatgrass, slender
—wheatgrass, `sedge, and rush. Cattails and bullrush grow
a the swampy spots associated with these range sites.
Potential production ranges from 4,000 pounds per acre in
favorable years to 3,000 pounds in unfavorable years. As
range condition deteriorates, the tall and mid grasses
decrease, production drops, and saltgrass, sedge, and rush
increase. The farming and irrigation in adjacent areas has
increased the amount of salts on much of the acreage.
Management of vegetation on this soil should be based
on taking half and leaving half of the total annual produc-
tion. Switchgrass, big bluestem, indiangrass, western
wheatgrass, pubescent wheatgrass, intermediate wheat-
grass, tall wheatgrass, and tall fescue are suitable for
seeding. The plants selected should met the seasonal
requirements of livestock. For successful seeding, a firm
prepared seedbed is needed. A grass drill should be used.
Seeding early in spring has proven most successful. Til-
lage is needed to eliminate the undesirable vegetation.
Wetland wildlife, especially waterfowl, utilize this unit.
The wetland plants provide nesting and protective cover
as well as some food. The nearby irrigated cropland,
where wildlife obtain much of their food and find protec-
tive cover, makes this unit valuable to both wetland and
openland wildlife.
Openland wildlife, especially pheasant, use this unit for
cover and nesting. Deer find excellent cover in some
areas. These valuable wildlife areas should be protected
from fire and fenced to prevent encroachment and
iveruse by livestock. They should not be drained. Capa-
bility subclass VIw; Aquolls in Salt Meadow range site,
Aquepts in Wet Meadow range site.
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