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supply of irrigation water is adequate, and the soil salinity is kept low in the root zone, <br /> this unit can produce 4 tons of alfalfa hay per acre. If this unit is used for homesite <br /> development, a somewhat limiting feature is moderate shrink-swell potential of the soil. <br /> An important consideration in landscape planning is the potential for build-up of salts <br /> and the soil surface in low-lying areas. Some areas of this unit may be subject to <br /> infrequent, shallow flooding. This map unit is capability subclasses Ills, irrigated, and <br /> Vis, non-irrigated. It is in the Slat Flat #34 range site. <br /> 71- Midway clay loam, 3 to 15 percent slopes. This shallow, well-drained soil is on <br /> ridges and knolls of the plains. If formed in residuum derived dominantly from shale. <br /> The native vegetation is mainly grasses. Elevation is 5,100 to 5,600 feet. The average <br /> annual precipitation is 11 to 13 inches, the average annual air temperature is 51 to 53 <br /> degrees F, and the average frost-free period is 150 to 170 days. Typically, the surface <br /> layer is light yellowish-brown clay loam about 3 inches thick. The upper 6 inches of the <br /> substratum is clay. The lower part to a depth of 16 inches of the substratum is clay. The <br /> lower part to a depth of 16 inches is extremely shaly clay. Highly fractured, weathered <br /> clay shale is at a depth of 16 inches. The soil is moderately alkaline. Included in this <br /> unit is about 5 percent moderately deep Gaynor silty clay loam and 5 percent deep in <br /> Limon silty clay loam on foot slopes. Also included is about 5 percent Shingle loam on <br /> small areas with a thin cap of siltstone residuum over shale. The Shingle soil is less <br /> clayey than this Midway soil. A delineation of this unit in the south-central part of the <br /> Sec. 23, T. 18 S., R. 68 W. Includes an area about 60 acres in size of shaly Badlan with <br /> widely scattered Gambel oak, ponderosa pine, pinon, and juniper. Permeability of this <br /> Midway soil is slow. Available water capacity is very low. Effective rooting depth is 6 to <br /> 20 inches. Runoff is medium to rapid, and the hazard of water erosion is moderate to <br /> high. This unit is used for rangeland. A few, small areas are included in irrigated <br /> hayland or pastureland. The soil is poorly suited to tillage and crop production. The <br /> potential plant community on this unit is mainly alkali sacaton, blue grama, galleta, and <br /> western wheatgrass. The average annual production of air-dry vegetation is about 550 <br /> pounds per acre. If the condition of the range deteriorates, galleta, greasewood, <br /> winterfat, western wheatgrass, fourwing saltbush, and frank bush increase. The main <br /> limitation for seeding are very shallow wetting and high runoff during most storms and <br /> the poor tilth of the thin topsoil. Range pitting is suitable where slope is about 10 <br /> percent or less. This unit is poorly suited to homesite development. The main <br /> limitations are shallow depth to shale, high shrink-swell potential, and shallow <br /> permeability of the solid. This map unit is in capability subclass Vie, non-irrigated. It is <br /> in the Shaly Plains#46 range site. <br />