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20 I!' The potential plant community on this unit is mainly blue grama, needleandthread, and prairie sandreed. The average annual production of air-dry vegetation ranges from 600 to 1,700 pounds. If the range is overgrazed, the proportion of preferred forage plants decreases and the proportion of less preferred forage plants increases. Therefore, livestock grazing should be managed so that the desired balance of preferred species is maintained in the plant community. Range seeding is suitable if the range is in poor condition. The plants selected for seeding should meet the seasonal requirements of livestock or wildlife, or both. Other management practices that are suitable for use on this unit are proper range use, deferred grazing, and rotation grazing. If the plant cover is disturbed, protection from erosion is needed. Loss of the surface layer results In a severe decrease in productivity and in the potential of the soil to produce plants suitable for grazing. This unit is well suited to windbreaks and environmental plantings. Soil blowing can be reduced by cultivating only in the tree rows and by leaving a strip of vegetation between the rows. Supplemental irrigation may be needed when planting and during dry periods. This map unit is in capability subclass Vie, nonirrigated, and in Sandy Plains range site. 19-Bushman-Curabith-Canyon complex, 0 to 20 percent slopes. This map unit is on upland ridges, breaks, and knolls. This unit is 45 percent Bushman fine sandy loam, 30 percent Curabith loam, and 20 percent Canyon gravelly loam. The Bushman soil is on backslopes and foot slopes of upland ridges. The Curabith and Canyon soils are on shoulders of upland ridges and on breaks and knolls. Slopes are moderately dissected and convex on the shoulders and are slightly dissected to moderately dissected and concave on the backs lopes and foot slopes. The individual components of this unit are in areas so narrow that it was not practical to map them separately at the scale used. Included in this unit are small areas of Ascalon fine sandy loam on backslopes and foot slopes of upland ridges and Nunn and Haverson loams in small drainageways dissecting upland ridges. Also included are some areas of Rock outcrop. Included areas make up about 5 percent of the total acreage. The Bushman soil is deep and weli drained. It formed in calcareous loamy alluvium. Typically, the surface layer is brown f.ine sandy loam 6 inches thick. Below this te a depth of 60 inches or more is calcareous sandy loam. Permeability of the Bushman soil is moderate. Available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is medium, and the hazard of water erosion is slight to high. The hazard of soil blowing is moderate. The Curabith soil is deep and well drained. It formed in calcareaus loamy alluvium. Typically, the surface layer is I f '[ il Ii! II 1.1 , I :1 iI !'HI I: Ii . .1'.;~li . , " Soil surv~ dark grayish brown loam 10 inches thick. The upper 15 inches of the underlying material is very channery sandy ioam, the next 17 inches is channery sandy loam, and the lower part to a depth of 60 inches or more is very channery loamy sand. The soil is calcareous throughout. Permeability of the Curabith soil is moderate. Available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight to very high. The hazard of soil blowing is slight. The Canyon soil is shallow and well drained. It formed in calcareous loamy residuum derived from sandstone. Typically, the surface layer is dark grayish brown gravelly loam 3 inches thick. Below this is gravelly loam 11 inches thick. Sandstone is at a depth of 14 inches. Depth to sandstone ranges from 10 to 20 inches. The soil is calcareous throughout. Permeability of the Canyon soil is moderate. Available water capacity is low. Effective rooting depth is 10 to 20 inches. Runoff is slow, and the hazard of water erosion is moderate to high. The hazard of soil blowing is slight. This unit is used as rangeland. The potential plant community on the Bushman soil is mainly blue grama, western wheatgrass, needleandthread, and little bluestem. The average annual production of alr-dry vegetation ranges from 700 to 1 ,SOO pounds. The potential plant community on the Curabith and Canyon soils is mainly blue grama, little bluestem, sideaats grama, and sedges. The average annual production of air-dry vegetation ranges from 500 to 1,200 pounds on the Curabith soil and from 400 to 1,000 pounds on the Canyon soil. If the range is overgrazed, the proportion of preferred forage plants decreases and the proportion of less preferred forage plants increases. Therefore, livestock grazing should be managed so that the desired balance of preferred species is maintained in the plant community. Management practices that are suitable for use on this unit are proper range use, deferred grazing, and rotation grazing. If the plant cover is disturbed, protection from erosion is needed. Loss of the surface layer results in a severe decrease in productivity and in the potential of the unit to produce plants suitable for grazing. This unit is poorly suited to windbreaks and environmental planting. This map unit is in capability subclass Vis, nonirrigated. The Bushman soil is in Sandy Plains range site, and the Curabith and Canyon soils are in Limestone Breaks range site. 20-Cascajo gravelly sandy loam, 5 to 20 percent slopes. This deep, excessively drained soil is on backslopes and shoulders of moderately dissected to highly dissected upland ridges and breaks. It formed in calcareous gravelly alluvium. Slopes are concave. Areas are long and narrow and are 20 to 1,000 acres. Typically, 15 to 35 percent of the surface is covered with gravel and cobbles. The surface layer is dark