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' San Joaquin County, California 101 Permeability is moderately slow in the Ramoth soil. Typically, the surface layer is pale brown and light Available water capacity is moderate. The effective brown sandy loam about 14 inches thick. The upper 18 rooting depth is 60 inches or more. Runoff is medium, inches of the subsoil is light brown sandy loam. The ' and the hazard of water erosion is moderate. The rate lower 22 inches is reddish yellow, strong brown, and of water intake in irrigated areas is 1.5 inches per hour, light brown sandy clay loam. The substratum to a depth Most areas of this unit are used for livestock grazing of 60 inches is strong brown coarse sandy loam. In or dryland grain crops. A few areas are used for some areas the surface layer is loamy coarse sand or ' irrigated vineyards. coarse sandy loam. Where this unit is used for livestock grazing, general Included in this unit are small areas of Kingdon and management considerations include the hazard of Tokay soils in the slightly lower landscape positions; ' erosion. The characteristic plant community is mainly small areas of Cometa, Kaseberg, and Montpellier soils soft chess, ripgut brome, wild oat, and filaree. Grazing on the slightly higher terraces; and small areas of should be controlled so that desirable vegetation, such moderately coarse textured soils that are deep to a as soft chess, is maintained and enough vegetation is hardpan and are in landscape positions similar to those ' left standing to protect the soil from erosion. of the Ramoth soil. Also included, on toe slopes, are Where this unit is used for dryland grain crops, the small areas of Ramoth soils that have slopes of 5 to 15 main limitation is low rainfall during the growing season. percent. Included areas make up about 15 percent of ' General management considerations include the hazard the total acreage, of erosion. Because the amount of precipitation is not Permeability is moderately slow in the Ramoth soil. sufficient for annual crapping, the best suited cropping Available water capacity is moderate. The effective system is one that includes small grain and summer rooting depth is 60 inches or more. Runoff is medium, t fallow. All tillage should be on the contour or across the and the hazard of water erosion is severe. slope. Limiting tillage during seedbed preparation and This unit is used mainly for livestock grazing. General during the application of weed-control measures helps management considerations include the severe hazard ' to control runoff and erosion. Leaving crop residue on of erosion. The characteristic plant community is mainly or near the surface helps to conserve moisture, soft chess, ripgut brome, wild oat, and filaree. Grazing maintain tilth, and control erosion. should be controlled so that desirable vegetation, such This unit is suited to irrigated vineyards. General as soft chess, is maintained and enough vegetation is ' management considerations include the hazard of left standing to protect the soil from erosion. Loss of the erosion. Annual cultivation should be avoided on the surface layer results in a severe decrease in steeper slopes. All tillage should be on the contour or productivity and in the potential of the unit to produce ' across the slope. If the soil is plowed in fall, runoff and plants suitable for grazing. erosion can be controlled by applying fertilizer and This map unit is in capability unit IVe-1 (MLRA-17), seeding a cover crop. Sprinkler and drip irrigation nonirrigated. It is in vegetative soil group A. systems are suitable. They permit an even, controlled ' application of water, help to prevent excessive runoff, 219—Redding loam, 0 to 3 percent slopes. This and minimize the risk of erosion. Returning crop residue moderately well drained, nearly level and gently sloping to the soil or regularly adding other organic material soil is on high terraces. It is moderately deep to a ' improves fertility, minimizes crusting, and maintains the hardpan. It formed in alluvium derived from mixed rock rate of water intake. sources- The native vegetation is mainly annual grasses This map unit is in capability unit IVe-1 (MLRA-17), and forbs. Slopes are complex, and the landscape is irrigated and nonirrigated. It is in vegetative soil group characterized by hummocky microrelief. Meandering ' A drainageways and closed depressions fill with water to form vernal pools during the winter in many areas. 218—Ramoth sandy loam, 15 to 30 percent slopes. Elevation is 130 to 300 feet. The average annual This very deep, well drained, moderately steep soil is precipitation is about 17 inches, the average annual air on dissected terraces. It formed in alluvium derived temperature is about 60 degrees F, and the average from granitic rock sources. A few gullies have formed. frost-free period is about 260 days. The native vegetation is mainly annual grasses and Typically, the upper part of the surface layer is light forbs and scattered oaks. Elevation is 100 to 190 feet. brown loam about 6 inches thick. The lower part is The average annual precipitation is about 17 inches, yellowish red loam about 21 inches thick. The upper the average annual air temperature is about 60 degrees part of the subsoil is a claypan of yellowish red clay F, and the average frost-free period is about 260 days. about 3 inches thick. The lower part to a depth of 611