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<br />Rio Blanco County Area, Colorado
<br />Permeability of this Redrob soil is moderate. Available
<br />water capacity is moderate. Effective rooting depth is 60
<br />inches or more for water-tolerant plants, but it is limited
<br />to depths between 20 and 40 inches for non-water-
<br />tolerant plants. Runoff is medium, and the hazard of
<br />water erosion is slight. A high water table is at a depth of
<br />18 to 48 inches year-round. This soil is subject to brief
<br />periods of flooding in May to July. Ice jams also cause
<br />flooding during prolonged cold periods in winter.
<br />This unit is used for irrigated hay and pasture and for
<br />wildlife habitat.
<br />This unit is well suited to irrigated hay and pasture.
<br />The main limitations are the restricted rooting depth for
<br />non-water-tolerant plants and a short growing season.
<br />Wetness limits the choice of plants and the period of
<br />cutting or grazing and increases the risk of winterkill. Use
<br />of nitrogen and phosphorus fertilizer promotes good
<br />growth of forage plants. Furrow, border, corrugation, and
<br />sprinkler irrigation systems are suited to the unit.
<br />Leveling helps to insure the uniform application of water.
<br />This unit provides food and cover for waterfowl and
<br />wetland wildlife.
<br />This unit is poorly suited to urban development. The
<br />main limitations are depth to the water table and the
<br />hazard of flooding.
<br />This map unit is in capability subclass Illw. It is in
<br />Riverbottom range site.
<br />72-Redrob Variant loam. This deep, somewhat
<br />poorly drained soil is on alluvial valley floors, low
<br />terraces, and flood plains. It formed in mixed alluvium.
<br />Slope is 0 to 3 percent. Areas are irregular and
<br />elongated in shape and are 10 to 50 acres in size. The
<br />native vegetation is mainly meadow grasses and sedges.
<br />Elevation is 7,100 to 8,500 feet. The average annual
<br />precipitation is 18 to 22 inches, the average annual air
<br />temperature is 37 to 39 degrees F, and the average
<br />frost-free period is 45 to 80 days.
<br />Typically, the surface layer is very dark gray loam 3
<br />inches thick. The subsoil is black loam 12 inches thick.
<br />The underlying material to a depth of 60 inches or more
<br />is stratified, grayish brown very gravelly loamy sand and
<br />brown very gravelly sand. In some areas the surface
<br />layer is sandy loam or sandy clay loam.
<br />Included in this unit are small areas of Fluvaquents,
<br />frequently flooded; Curecanti very cobbly loam; Delson
<br />and Perma soils; and Redrob and Silas loams. Also
<br />included are small areas of soils that are similar to this
<br />Redrob Variant soil but are shallower or deeper over
<br />gravelly loamy sand. Included areas make up about 15
<br />percent of the total acreage. The percentage varies from
<br />one area to another.
<br />Permeability of this Redrob Variant soil is moderate.
<br />Available water capacity is moderate. Effective rooting
<br />depth is 60 inches or more for water-tolerant plants, but
<br />it is limited to depths between 10 and 40 inches for non-
<br />water-tolerant plants. Runoff is medium, and the hazard
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<br />of water erosion is slight. A high water table is at a depth
<br />of 24 to 48 inches year-round. This soil is subject to brief
<br />periods of flooding in May through July.
<br />This unit is used for irrigated hay and pasture and for
<br />wildlife habitat.
<br />This unit is well suited to irrigated hay and pasture.
<br />The main limitations are the restricted rooting depth for
<br />non-water-tolerant plants and a short growing season.
<br />Wetness limits the choice of plants and the period of
<br />cutting or grazing and increases the risk of winterkill.
<br />Use of nitrogen and phosphorus fertilizer promotes
<br />good growth of forage plants. Proper stocking rates,
<br />pasture rotation, and restricted grazing during wet
<br />periods help to keep the pasture in good condition and
<br />to protect the soil from erosion.
<br />Furrow, border, corrugation, and sprinkler irrigation
<br />systems are suited to this unit. Leveling helps to insure
<br />the uniform application of water.
<br />This map unit is in capability subclass Vlw. It is in
<br />Mountain Meadow range site.
<br />73-Rentsac channery loam, 5 to 50 percent
<br />slopes. This shallow, well drained soil is on ridges,
<br />foothills, and side slopes. It formed in residuum derived
<br />dominantly from calcareous sandstone. Areas are
<br />elongated and are 200 to 5,000 acres. The native
<br />vegetation is mainly pinyon, juniper, brush, and grasses.
<br />Elevation is 6,000 to 7,600 feet. The average annual
<br />precipitation is 14 to 18 inches, the average annual air
<br />temperature is 42 to 45 degrees F, and the average
<br />frost-free period is 80 to 105 days.
<br />Typically, the surface layer is grayish brown channery
<br />loam about 5 inches thick. The next layer is very
<br />channery loam about 4 inches thick. The underlying
<br />material is extremely flaggy light loam 7 inches thick.
<br />Hard sandstone is at a depth of 16 inches. Depth to
<br />sandstone ranges from 10 to 20 inches.
<br />Included in this unit are small areas of Blazon
<br />channery loam, Forelle loam, Moyerson stony clay loam,
<br />Piceance loam, Redcreek fine sandy loam, and Yamac
<br />loam. Also included are small areas of soils that are
<br />similar to this Rentsac soil but are less than 10 inches
<br />deep and small areas of Rock outcrop. Included areas
<br />make up about 20 percent of the total acreage. The
<br />percentage varies from one area to another.
<br />Permeability of this Rentsac soil is moderately rapid.
<br />Available water capacity is very low. Effective rooting
<br />depth is 10 to 20 inches. Runoff is rapid, and the hazard
<br />of water erosion is moderate to very high.
<br />This unit is used mainly for livestock grazing and
<br />wildlife habitat. It is also used as woodland.
<br />The potential plant community on this unit is mainly
<br />pinyon and Utah juniper with an understory of Indian
<br />ricegrass, beardless wheatgrass, mountain mahogany,
<br />and prairie junegrass. Smaller amounts of big sagebrush,
<br />bitterbrush, and serviceberry commonly are also present
<br />in the potential plant community. The potential
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