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13
<br /> Custer County Area. Colorado
<br /> needs to be leveled and irrigation water managed to distribution of irrigation water, control erosion, and
<br /> -in uniform distribution of water, control erosion, and prevent large losses of water. Applications of manure
<br /> i ant large losses of water. Applications of manure and commercial fertilizer containing nitrogen and
<br /> and commercial fertilizer containing nitrogen and phosphorus help maintain soil fertility. Severe water
<br /> phosphorus help maintain soil fertility. Water erosion can erosion can occur if this soil is unprotected (fig. 1). With
<br /> occur if this soil is unprotected. With good management good management this soil is capable of producing
<br /> this soil is capable of producing about 5 tons of grass about 4.5 tons of grass hay per irrigated acre.
<br /> hay per irrigated acre. The potential native vegetation is mainly Arizona
<br /> The potential native vegetation is mainly Arizona fescue, mountain mutely, western wheatgrass, and Parry
<br /> fescue, mountain muhly, western wheatgrass, and Parry oatgrass. As the range deteriorates, blue grama,
<br /> oatgrass. As the range deteriorates, blue grama, sleepygrass, fringed sage, slimstem muhly, and
<br /> sleepygrass, fringed sage,slimstem mutely, and - -- rabbitbrush increase. Renovating and,using a planned
<br /> rabbitbrush increase. Renovating and using a planned grazing system, cross fencing, and livestock water
<br /> grazing system, cross fencing, and livestock water developments help to prevent range deterioration and
<br /> developments help to prevent range deterioration and promote the production of the more desirable plants. In
<br /> promote the production of the more desirable plants. In renovating, seed should be drilled into a well prepared,
<br /> renovating, seed should be drilled into a well prepared, firm, weed-free seedbed. Suitable grasses for seeding
<br /> firm, weed-free seedbed. Suitable grasses for seeding are intermediate wheatgrass, pubescent wheatgrass,
<br /> are intermediate wheatgrass, pubescent wheatgrass, western wheatgrass, and Arizona fescue.
<br /> western wheatgrass, and Arizona fescue. Slope is the main limitation to use of this soil as
<br /> This soil is well suited to use as homesitus. However, homesites. Designs should be modified for foundations
<br /> included areas of Venable soil adjacent to streams are and septic tank absorption fields in the steeper areas.
<br /> subject to ponding or flooding. This Coutis soil is a good This soil is a good source of topsoil.
<br /> This soil is in capability subclasses Vie, nonirrigated,
<br /> source of topsoil. and Vie, irrigated.
<br /> This soil is in capability subclasses Vie, nonirrigated,
<br /> and Vc, irrigated.
<br /> 10—Feltonia sandy loam, 2 to 6 percent slopes.
<br /> 9--Coutis sandy loam, 5 to 15 percent slopes.This This is a deep, well drained soil on terraces and fans
<br /> is a deep, well drained soil along upland drainageways (fig, 2). It formed in alluvium. Elevation is 7,800 to 8,500
<br /> on foot slopes and stream terraces. It formed in feet. The average annual precipitation is 14 to 17 inches,
<br /> r. d alluvium. Elevation is 7,800 to 8,800 feet_ The the average annual air temperature is 40 to 44 degrees
<br /> average annual precipitation is 14 to 20 inches, the F, and the frost-free season is 55 to 75 days.
<br /> -^verage annual air temperature 40 to 44 degrees F, and Typically, the surface layer is grayish brown sandy -
<br /> ,ie frost-free season is 55 to 75 days. loam 8 inches thick. The subsoil is dark grayish brown
<br /> Typically, the surface layer is dark brown sandy loam gravelly sandy loam 11 inches thick. The substratum is
<br /> 11 inches thick. It is underlain by dark brown sandy loam light brownish gray gravelly sandy loam in the upper 13
<br /> 37 inches thick. The substratum is brown gravelly loam inches and is white very gravelly sandy loam to a depth
<br /> to a depth of 60 inches or more. The soil is slightly acid of 60 inches or more. The soil is mildly alkaline to a
<br /> to a depth of 11 inches and neutral below that depth. depth of 19 inches and is moderately alkaline and
<br /> Included with this soil in mapping are areas of calcareous below that depth.
<br /> Norriston extremely cobbly sandy loam on the steeper Included with this soil in mapping are areas of Coutis
<br /> terrain and areas of Venable loam on low stream sandy loam along foot slopes and drainageways and
<br /> terraces and in depressions. The Norriston soil makes up Silvercliff gravelly sandy loam along terrace edges. The
<br /> about 15 percent of the map unit, and the Venable soil Coutis soil makes up about 20 percent of the map unit,
<br /> , and the Silvercliff soil makes up 10 percent.
<br /> makes up 5 percent
<br /> Permeability of this Coutis soil is moderately rapid, and Permeability of this Feltonia soil is moderate, and the
<br /> the available water capacity is moderate. The effective available water capacity is tow. The effective rooting
<br /> rooting depth is water
<br /> inches or more. Surface runoff is depth is 60 inches or more. Root growth is somewhat
<br /> medium, and the hazard of erosion is high to very high. restricted by high amounts of calcium carbonate at a
<br /> Most of the acreage is used as rangeland and irrigated depth of more than 32 inches. Surface runoff is medium,
<br /> hayland. MUtures of brome, orchardgrass, pubescent and the hazard of erosion is moderate to high.
<br /> wheatgrass, and timothy are commonly grown. Most areas of this soil are used as rangeland.
<br /> Where this soil is irrigated, the main management The potential native vegetation is mainly
<br /> concerns are proper use of water, maintenance of soil needleandthread, western wheatgrass, mountain mutely,
<br /> fertility, and reduction of soil erosion. Flooding is the and Arizona fescue. As the range deteriorates, Llutl
<br /> common method of irrigation, but sprinklers and contour grama, gray horsebrush, rabbilbrush,
<br /> ditches are also suitable methods. The land needs to be slimstem muhly, and snakeweed increa-m
<br /> i- ,led and irrigation water managed to obtain uniform and using a planned grazing system. cro,•; `•r• - •�' a�,u
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