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196-Manteca lnie sand I®arm, 0 to 2 percent slopes. This moderatelywell drained, nearly level soil is on low terraces. it is moderately III hardpan. It formed in alluvium derived from mixed rock sources. Elevation is 20 t 1 10 feet. The j average annual precipitation is about 11 inches, the average annual air temperature is ab degrees F, and the average frost-free period is about 270 days. out 60 r Typically, the surface layer is grayish brown fine sandy loam about 11 inches thick. The upper-part of the subsoil is grayish brown and light brownish gray fine sandy loam about 13 inches thick. The next part is a light grey, indurated hardpan, which extends to a depth of 35 inches. The lower part is a light gray, weakly cemented to strongly cemented hardpan, which extends ' th of 54 inches. The underlying material to a depth of 74 inches is variegated light gaytnd white sand loam. In some areas the surface layer is loam or clay loam. y Included in this unit are small areas of Tinnin and Veritas soils on the slightly higher parts of the landscape, small areas of Guard and Trahern soils on the slightly lower parts, and a few areas ( where depth to the hardpan is as little as 10 inches, mainly where deep leveling cuts have been made. Also included .are some areas of soils that have been subsoiled or deeply ripped and have �^ fragments of cemented material on the surface and throughout the profile. Included areas make s up about 15 percent of the total acreage. I Permeability is moderate in the Manteca soil. Available water capacity is low. The effective rooting j depth is limited by the hardpan at a depth of 20 to 40 inches. Depth to the water table is more than 6 feet, but water may be perched above the hardpan after periods of heavy rainfall or irrigation. Runoff is slow, and the hazard of water erosion is slight. The rate of water intake in irrigated areas is 1.5 inches per hour. The hazard of soil blowing is moderate. The soil is subject to rare flooding, N which occurs during years of abnormally high precipitation. j Most areas are used for irrigated crops or vineyards. A few areas are used as irrigated pasture or. i for homesite development. This unit may provide wetland functions and values. These should be considered in plans for enhancement of wildlife habitat or land use conversion. This unit is suited to irrigated row, field, and vineyard crops. The main limitations are depth to the hardpan and the low available water capacity. General management considerations include the hazard of soil blowing. The hardpan limits the suitability for deep-rooted crops. Where feasible, deep ripping of this restrictive layer can help to overcome this limitation. Because the soil is droughty, applications of irrigation water should be light and frequent; Careful applications are needed to prevent the buildup of a high water table. Furrow, border, and sprinkler G irrigation systems are suitable. A tillage pan forms easily if the soil is tilled when wet. Chiseling or subsoiling breaks up the pan. When the wind.velocity is high in spring, the hazard of soil blowing can be reduced by properly managing all crop residue and by minimizing tillage. u This unit is suited to irrigated-pasture. irrigation water can be applied by sprinkler and border methods. Leveling helps to ensure a uniform application of water. Proper stocking rates, pasture Refer to page 22 for Endnotes and Reference Sources ®Western Dairy Design Associates,Inc.20W Page 7