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67--Manvel silty clay loam, saline. This deep, moderately well drained soil is on stream terraces and swales. It formed in alluvium derived dominantly from limestone and shale. Slope is 1 to 3 percent, The native vegetation is mainly grasses. Elevation is 5,000 to 5,400 feet. The average annual precipitation is 12 to 14 inches, the average annual air temperature is 51 to 53 degrees F, and the average frost-free period is 160 to 170 days. Typically, the soil is silty clay loam about 30 inches thick over silt loam to a depth of 60 inches or more. The soil is moderately alkaline and saline. Included in this unit is an area in the southwest comer of Sec. 6, T. 19 S., R. 68 W., adjacent to the Brush Hollow Creek drainageway, of very poorly drained soils. The high water table is caused by seepage of irrigation water. Steepness of slope is about 3 to 6 percent, and the vegetation is typical of saline meadow areas. Permeability of this Manvel soil is moderate or moderately slow. 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 moderate. In most areas the upper soil is moderately saline. In a few azeas, the upper soil is slightly saline. The salinity of the root zone can be reduced significantly where irrigated. This unit is used mainly for rangeland. It is also used for imgated hayland and pasture land. Alfalfa or a mixture of grass and alfalfa are commonly grown. The potential plant community on this unit is mainly alkali sacaton, blue grama, western wheatgrass, and fourwing saltbush. The average annual production of air-dry vegetation is about 1,200 pounds per acre. If the condition of the range deteriorates, blue grams, inland saltgrass, fourwing saltbush, and black greasewood increase. Range seeding ins suitable if the range is in poor condition. Important management concerns in areas of irrigated hay and pasture aze preventing a build-up of salts in the root zone of the soil, efficient application of irrigation water, and maintenance of soil fertility an filth. Salt tolerant crops are best adapted to this unit Irrigation water should be applied in sufficient amount and frequently enough to leach salts downward and prevent and increase in the salinity of root zone soil water during the growing season. Irrigation water can be applied by furrow, corrugation, border flooding, and sprinklers. For the efficient application and removal of irrigation water, leveling is needed in sloping areas. If row crops or small grains are grown, the use of a crop rotation system that includes grasses and legumes helps to maintain fertility and filth. Returning core residue to the soil or regularly adding other organic matter improves fertility, reduces crusting, and increases the water intake rate. Nonleguminous crops respond to nitrogen and phosphorus, and Leguminous crops respond to phosphorus. If properly managed, the supply of irrigation water is adequate, and the soil salinity is kept low in the root zone, this unit can produce 4 tons of alfalfa hay per acre. If this unit is used for homesite development, a somewhat limiting feature is moderate shrinl:-swell potential of the soil. An important consideration in landscape planning is the potential for build-up of slats and the soil surface in low-lying azeas. Some areas of this unit may be subject to infrequent, shallow flooding. This map unit is in capability subclasses Ills, irrigated, and Vis, non-irrigated. It is in the Slat Flat #34 range site.