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' San Joaquin County, California 89 ' textured channel dredge tailings. Included areas make dense, weakly cemented sandy loam or coarse sandy up about 15 percent of the total acreage. loam. In some areas the surface layer is coarse sandy Permeability is moderately slow in the Merritt soil. loam. Available water capacity is high. The effective rooting Included in this unit are small areas of Cometa, ' depth of the crops commonly grown in the county is Redding, and Rocklin soils on terraces and small areas limited by an apparent water table that has been of coarse textured soils in convex positions near the top lowered to a depth of 4 to 6 feet through drainage of the slopes. Also included, on toe slopes, are small systems that require continual maintenance. Runoff is areas of Montpellier soils that have slopes of 5 to 8 slow, and the hazard of water erosion is slight. The rate percent. Included areas make up about 15 percent of of water intake in irrigated areas is 0.3 inch per hour. the total acreage. This soil is subject to occasional, long periods of I Permeability is moderately slow in the upper part of ' flooding from December through March. Channeling and the Montpellier soil and very slow in the dense subsoil. deposition are common along streambanks. Available water capacity is moderate. The effective Most areas are used for irrigated crops. This unit rooting depth is more than 60 inches, but roots are ' may provide wetland functions and values. These restricted to cracks and the faces of peds in the dense should be considered in plans for enhancement of subsoil, which is at a depth of 40 to 60 inches. Depth to wildlife habitat or land use conversion. the water table is more than 6 feet, but water may be This unit is suited to irrigated row and field crops. briefly perched above the dense subsoil or underlying ' The main limitation is the high water table. The sediments after periods of heavy rainfall or irrigation. occasional flooding is a hazard. Areas adjacent to Runoff is medium, and the hazard of water erosion is levees are subject to lateral seepage in wet years when 1 moderate. The rate of water intake in irrigated areas is the water level is high. Careful applications of irrigation 1.5 inches per hour. water are needed to prevent the buildup of a high water Most areas of this unit are used for livestock grazing table. Tile drainage can lower the water table if a or dryland grain crops. A few areas are used for suitable outlet is available. Furrow, border, and sprinkler irrigated orchards or vineyards or for homesite ' irrigation systems are suitable. Most climatically development. adapted crops can be grown if the soil is protected from Where this unit is used for livestock grazing, general flooding late in spring and early in summer and if a management considerations include the hazard of ' drainage system is installed. The risk of flooding can be erosion. The characteristic plant community is mainly reduced by levees and diversions_ Returning crop soft chess, ripgut brome, wild oat, and filaree. Grazing residue to the soil or regularly adding other organic should be controlled so that desirable vegetation, such material Improves fertility, minimizes crusting, and as soft chess, is maintained and enough vegetation is increases the rate of water intake. left standing to protect the soil from erosion. Loss of the This map unit is in capability units Ilw-2 (MLRA-17), surface layer results in a severe decrease in irrigated, and IVw-2 (MLRA-17), nonirrigated. It is In productivity and in the potential of the unit to produce 1 vegetative soil group A. plants suitable for grazing. Where this unit is used for dryland grain crops, the 199—Montpellier sandy loam, 8 to 15 percent main limitation is low rainfall during the growing season. slopes. This moderately well drained, rolling soil is on General management considerations include the hazard ' dissected terraces. It is deep to dense, weakly of erosion. Because the amount of precipitation is not cemented sediments. It formed in old alluvium derived sufficient for annual cropping, the best suited cropping from granitic rock sources. The vegetation in areas that system is one that includes small grain and summer ' have not been cultivated is mainly annual grasses and fallow. All tillage should be on the contour or across the forbs and scattered California white oak. Elevation is slope. Limiting tillage during seedbed preparation and 100 to 300 feet. The average annual precipitation is during the application of weed control measures helps about 16 inches, the average annual air temperature is to control runoff and erosion. Leaving crop residue on ' about 60 degrees F, and the average frost-free period is or near the surface helps to conserve moisture, about 260 days. maintain tilth, and control erosion. Typically, the surface layer is light reddish brown and This unit is suited to irrigated orchard and vineyard ' brown sandy loam about 18 inches thick. The upper crops. The main limitation is the depth to dense, weakly part of the subsoil is light reddish brown sandy clay cemented sediments. General management loam about 28 inches thick. The next part is reddish considerations include the hazard of erosion. The brown coarse sandy loam about 8 inches thick. The dense, weakly cemented sediments limit the suitability ' lower part to a depth of 60 inches is reddish brown, for deep-rooted crops. Where feasible, deep ripping of