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~` 3 - Ayuolis and Agents, gravelly substratum <br />~l <br />These nearly level soils are on bottom lands and flood plains of all <br />the major streams in the survey area. The Aquolls, which have dark <br />colored surface layers, make up about 65 percent of the mapping unit. <br />The Aquents, which have lighter colored surface layers, make up about <br />25 percent. About 10 percent is Aquolls and Aquepts, flooded, and <br />Bankard sandy loam, <br />These are deep, poorly drained soils. Tiiey formed in recent alluvium. <br />Typically they have mottled, mildly to moderately alkaline, loamy or <br />~ ~ <br />clayey surface layers and underlying material, and are underlain by. <br />a.- <br />sand or sand and gravel within 48 inches. They may or may not have a <br />~~ gleyed layer in the underlying material. <br />~~-~>, <br />Flost of these soils are subject to flooding. A watertable is ,3t or <br />near the surface early in the spring and recedes to as deep as 48 <br />inches by late fall in some years. <br />These soils are used for rangeland and wildlife habitat. Some small <br />areas have been reclaimed by major drainage and leveling operations <br />and is farmed to irrigated crops, <br />The potential native vegetation on these soils is dominated by alkali <br />sacaton,'switchgrass and western wheatgrass. Salt grass, sedge;. rush <br />and alkali bluegrass are also prominent. Potential production ranges <br />from 3000 pounds per acre in favorable years to 2000 pounds per acre <br />in unfavorable years. When range condition deteriorates, switchgrass, <br />