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<br />The potential plant community on this unit is mainly
<br />blue grama and western v,heatgrass. Other grasses that
<br />characterize the unit are sideoats grama, winterfat, and
<br />needleandthread. The average annual production of air-
<br />dry vegetation is about 1,000 pounds per acre. If the
<br />condition of the range deteriorates, snakeweed,
<br />threeawn, galleta, and pricklypear increase. Livestock
<br />grazing should be managed to protect the soil in this unit
<br />from excessive erosion. Range seeding may not be
<br />successful, because the soil usually is dry below the thin
<br />surface layer.
<br />This unit is poorly suited to windbreaks and
<br />environmental plantings. The main limitations are the
<br />limited rooting depth and the droughtiness of the soil.
<br />If this unit is used for homesite development, the main
<br />limitation is the shrink•swell potential. The effects of
<br />shrinking and swelling can be reduced by maintaining a
<br />constant moisture content around the foundation,
<br />Backfilling with material that has low shrink-swell
<br />potential can also reduce the effects of shrinking and
<br />swelling.
<br />Septic lank absorption fields will not function
<br />adequately because of the slow permeability of the soil.
<br />In addition, the effluent may run downslope along the top
<br />of the shale and surface in lower lying areas.
<br />This map unit is in capability subclass Vle,
<br />nonirrigated. It is in Loamy Plains range site.
<br />69-Razor silty clay, 2 to 20 percent slopes. This
<br />moderately deep, well drained soil is on uplands. It
<br />formed in residuum and colluvium derived dominantly
<br />Irom shale. The native vegetation is mainly grass.
<br />Elevation is 5,500 to 6,300 feet. The average annual
<br />precipitation is 12 to 15 inches, the average annual air
<br />temperature is 49 to 54 degrees F, and the average
<br />frost-free period is 125 to 160 days.
<br />Typically, the surface layer is light brovrnish gray silty
<br />clay about 7 inches thick. The subsoil is silty clay about
<br />13 inches thick. The substratum is silty clay about 15
<br />inches thick. Soft shale is at a depth of about 35 inches.
<br />The soft is moderately alkaline throughout.
<br />Included in this unit is about 20 percent nearly level
<br />Limon silty clay loam that is deep over shale. Also
<br />included are small areas of shallow Midway clay on
<br />steep slopes and along the crest of long slopes and
<br />soils that are subject to severe gullying.
<br />Permeability of this Razor soil is slow. Available vrater
<br />capacity is lour. Effective rooting depth is 20 to 40
<br />inches. Runoff is rapid to very rapid, and the hazard of
<br />vrater erosion is high to very high.
<br />This unit is used as rangeland.
<br />The potential plant community on this unit is mainly
<br />alkali sacaton, western vrheatgrass, blue grama, and
<br />sideoats grama. Other grasses that characterize the unit
<br />are winterfat, fourwing saltbush, and little bluestem. The
<br />average annual production of air-dry vegetation is about
<br />800 pounds per acre. If the condition of the range
<br />deteriorates, galle(a, threeawn, snakeweed, and
<br />Soil su
<br />pricklypear increase. Livestock grazing should be
<br />managed to protect the soil from excessive erosion.
<br />Range seeding may not be successful, because the s
<br />usually is dry.
<br />This unit is poorly suited to windbreaks and
<br />environmental plantings. The main limitations are the
<br />limited rooting depth, the droughtiness of the soil, and
<br />the presence of deep gullies in some areas.
<br />This unit is poorly suited to homesite development. I
<br />is limited mainly by shrink-swell potential. Stow
<br />permeability, slope, and the hazard of erosion are also
<br />limitations.
<br />This map unit is in capability subclass Vle,
<br />nonirrigated. It is in Shaly Plains range site.
<br />70-Ring cobbly sandy loam, 2 to 6 percent
<br />slopes. This deep, well drained soil is on terraces. Il
<br />formed in alluvium. The native vegetation is mainly
<br />ponderosa pine and Gambel oak. Elevation is 7,200 to
<br />8,500 feet- The average annual precipitation is 1 B to 22
<br />inches, the average annual air temperature is 38 to 44
<br />degrees F, and the average frost-free period is 70 l0 10
<br />days.
<br />Typically, the surface is covered with a mat of pine
<br />litter about 1 inch thick. The surface layer is brown
<br />cobbly sandy loam about 5 inches thick. The subsurface
<br />layer is brown cobbly sandy loam about 5 inches thick.
<br />The upper 9 inches of the subsoil is cobbly clay loam,
<br />and the lower 18 inches is mainly very cobbly sandy
<br />clay. The substratum to a depth of 60 inches or more is
<br />very cobbly sandy clay loam. The soil is slightly acid to
<br />depth of 19 inches and neutral below that depth.
<br />Included in this unit is about 10 percent Morop loam it
<br />small parks. Also included are nests of cobbles on the
<br />surface.
<br />Permeability of this Ring soil is moderately slow.
<br />Available water capacity is low. Effective rooting depth is
<br />60 inches or more. Runoff is slow,to medium, and the
<br />hazard of vrater erosion is slight to moderate.
<br />This unit is used for livestock grazing, woodland,
<br />wildlife habitat, and recreation.
<br />The potential plant community is mainly ponderosa
<br />pine and an understory of Arizona fescue, mountain
<br />muhly, Gambel oak, and mountainmahogany. Al lower
<br />elevations, Gambel oak commonly dominates the site.
<br />The potential production of the native understory
<br />vegetation in normal years is about 1,000 pounds of air-
<br />dry vegetation per acre.
<br />This unit is suited to the limited production of
<br />ponderosa pine. The site index for this unit is about 54.
<br />The unit can produce about 3,000 cubic feet or 11,900
<br />board feet (International rule) of merchantable timber per
<br />acre from a fully stocked stand of even-aged trees 100
<br />years old. This unit is suited to the limited production of
<br />Christmas trees. This high value crop may be a viable
<br />economic alternative to the production of sawtimber. The
<br />use of spades for removing trees for transplanting is
<br />severely limited by the high content of cobbles in the
<br />soil.
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