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<br />and is moderately alkaline below that depth. An area in
<br />the southeastern one-fourth of sec. 11, T. 17 S., R. 67
<br />W., contains red soils that are similar to the Nunn soil.
<br />Included with this soil in mapping are areas of Wages
<br />soils in the steeper areas. These soils have a surface
<br />layer of loam. They make up about 5 percent of the
<br />unit. They have less clay in the subsoil than the Nunn
<br />soil. Also included are small areas of Nunn soils that
<br />have a surface layer of stony loam. These soils are on
<br />upland breaks and in upland drainageways.
<br />Permeability is moderately slow or slow in the Nunn
<br />soil. Available water capacity is high. Effective rooting
<br />depth is 60 inches or more. Runoff is slow to rapid, and
<br />the hazard of water erosion is slight to high.
<br />This soil is used as rangeland.
<br />The potential plant community is mainly western
<br />wheatgrass, blue grama, needleandthread, prairie
<br />junegrass, and little bluestem. The average annual
<br />production of air-dry vegetation is about 1,200 pounds
<br />per acre. If the condition of the range deteriorates, blue
<br />grama, red threeawn, fringed sagebrush, and
<br />walkingstick cholla increase. Range seeding is suitable
<br />'f the range is in poor condition.
<br />If this soil is used for homesite development, the
<br />ain limitation is the moderately slow permeability in
<br />the subsoil. The absorptionlines of septic tank
<br />absorption fields should be placed below the subsoil.
<br />Increasing the size of the absorption fields also helps to
<br />compensate for the restricted permeability. The shrink-
<br />swetl potential is a moderate limitation on building sites.
<br />The effects of shrinking and swelling can be reduced by
<br />maintaining a constant moisture content around the
<br />foundation. The design of foundations and bearing walls
<br />should offset the effects of shrinking and swelling.
<br />Backfilling the excavation with material that has a low
<br />shrink-swell potential can also reduce the effects of
<br />shrinking and swelling.
<br />The capability classification is IVe, nonirrigated. The
<br />soil is in the Loamy Foothill #202 range site.
<br />80-Otero loamy fine sand, 3 to 8 percent slopes.
<br />This deep, well drained soil is on side slopes. It formed
<br />in alluvium and eolian fine sands. The native vegetation
<br />is mainly grasses. Elevation is 5,100 to 5,400 feet. The
<br />average annual precipitation is 11 to 13 inches, the
<br />average annual air temperature is 50 to 53 degrees F,
<br />and the average frost-free period is 150 to 170 days.
<br />The surface layer is typically pale brown loamy fine
<br />and about 3 inches thick. The substratum to a depth of
<br />0 inches or more is fine sandy loam. The soil is
<br />moderately alkaline.
<br />Included with this soil in mapping are areas of Kim
<br />soils. These soils have a surface layer of loam. They
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<br />Soil Survey
<br />make up about 5 percent of the unit. They are less
<br />sandy than the Otero soil.
<br />Permeability is moderately rapid in the Otero soil.
<br />Available water capacity is moderate. Effective rooting
<br />depth is 60 inches or more. Runoff is slow or medium,
<br />and the hazard of water erosion is slight or moderate.
<br />Most areas of this soil are used as rangeland. A few,
<br />areas are used as irrigated cropland. Hay and small
<br />grain are the main crops.
<br />The potential plant community is mainly blue grama,
<br />sideoats grama, little bluestem, needleandthread, and
<br />sand dropseed. The average annual production of air-
<br />dry vegetation is about 1,000 pounds per acre. If the
<br />condition of the range deteriorates, red threeawn,
<br />broom snakeweed, and rabbitbrush increase. Range
<br />seeding is suitable if the range is in poor condition.
<br />If this soil is used for irrigated crops, the main
<br />limitation is the limited available water capacity and a
<br />rapid rate of water intake. Because of the rapid water
<br />intake rate, sprinkler irrigation is the best method of
<br />irrigation. If furrow irrigation is used, the water should
<br />be applied at frequent intervals and runs should be
<br />short. Nonleguminous crops respond to applications of
<br />nitrogen and phosphorus, and leguminous crops
<br />respond to applications of phosphorus.
<br />This soil is well suited to homesite development.
<br />The capability classification is IVe, irrigated, and Vle,
<br />nonirrigated. The soil is in the Sandy Plains #26 range
<br />site.
<br />81-Otero fine sandy loam, 3 to 8 percent slopes.
<br />This deep, well drained soil is on side slopes and fans.
<br />It formed in alluvium and eolian sands. The native
<br />vegetation is mainly grasses. Elevation is 5,300 to
<br />5,900 feet. The average annual precipitation is 12 to 14
<br />inches, the average annual air temperature is 49 to 52
<br />degrees F, and the average frost-free period is 130 to
<br />155 days.
<br />The surface layer is typically dark grayish brown fine
<br />sandy loam about 2 inches thick. The substratum to a
<br />depth of 60 inches or more is sandy loam. The soil is
<br />mildly alkaline to a depth of 25 inches and is
<br />moderately alkaline below that depth.
<br />Included with this soil in mapping are areas of Kim
<br />soils. These soils have a surface layer of loam. They
<br />make up about 5 percent of the unit. They are less
<br />sandy than the Otero soil.
<br />Permeability is moderately rapid in the Otero soil.
<br />Available water capacity is moderate. Effective rooting
<br />depth is 60 inches or more. Runoff is slow to rapid, and
<br />the hazard of water erosion is slight to high.
<br />This soil is used as rangeland.
<br />The potential plant community is mainly blue grama,
<br />sand dropseed, Indian ricegrass, western wheatgrass,
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