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SOiI 5~,1 ~~ County ~ u I This unit is used mainly for irrigated field crops and pasture and as rangeland. It is also used for homesite and urban development. Alfalfa, barley, and oats are the main irrigated crops. The main management concerns in areas of irrigated ropland are controlling water erosion, maintaining the xganic matter content and fertility of the surface layer, nd properly using irrigation water. Land smoothing rproves distribution of irrigation water. The corporation of crop residue into the surface layer tcreases the water intake rate, improves filth, helps to Maintain the organic matter content of the surface layer, nd reduces erosion. The use of fertilizer helps to Maintain the productivity and fertility of the soil. Grain nd grasses respond to nitrogen, and legumes respond ~ phosphorus. Irrigation methods suited to this unit are grow, corrugation, and sprinkler systems. Sprinkler irrigation is well suited to most crops. Use of this method permits the even, controlled application of water, reduces runoff, and minimizes the risk of erosion. Furrow irrigation is suited to row crops. Corrugation irrigation is suited to alfalfa, small grain, and pasture. Regardless of the irrigation method used, water should be applied carefully to control erosion and ensure the most efficient use of water. The native vegetation on this unit is mainly western wheatgrass, Indian ricegrass, junegrass, blue grams, slender wheatgrass, muttongrass, squirreltail, big sagebrush, pinyon, and Rocky Mountain juniper. Proper grazing use as pan of a planned grazing system helps to maintain the quality and quantity of grasses. Mechanical or chemical brush control followed by seeding to adapted grasses improves areas that have dense stands of sagebrush. Seeding speeds up revegetation of areas Figure 9.-Native vegetation in an area of Sedlllo gravelly loam, o to 3 percent slopes.