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San Joaquin County,:California 31 F� minimizes crusting, and maintains the rate of water Most areas are used for irrigated crops. A few areas intake. are used as irrigated pasture or for homesite F'jThis unit is suited to irrigated pasture. The main development. This unit may provide wetland functions limitations are the saline-sodic conditions and the high and values. These should be considered in plans for F,. water#able. The concentration of salts and sodicity in enhancement of wildlife habitat or land use conversion. the surface layer limit the production of plants suitable This unit is suited to irrigated row and field crops. for irrigated pasture. Leaching the salts from the surface The main limitations are the low available water layer is difficult because of the high water table. A capacity, the rapid permeability, and the high water drainage system and irrigation water management table. General management considerations include the reduce the concentration of salts. Salt-tolerant species severe hazard of soil blowing. Because the soil is should be selected fon planting. Irrigation water can be droughty, applications of irrigation water should be light applied by sprinkler and border methods. Proper and frequent. The high percentage of sand in the soil stocking rates, pasture rotation, and restricted grazing n reduces g g es the amount of moisture available for plant during wet periods help to keep the pasture in good growth. Water should be applied in amounts sufficient condition and protect the soils from compaction. to wet the root zone but small enough to minimize the This map unit is in capability units lllw-6 (MLRA-17), leaching of plant nutrients. Careful applications of F. irrigated, and IVw-6 (MLRA-17), nonirrigated. It is in irrigation water are needed to prevent the buildup of a vegetative soil group F. high water table. Tile drainage can lower the water ` table if a suitable outlet is available. When the wind .: 109—Bisgani loamy coarse sand, partially drained, velocity is high in spring, the hazard of soil blowing can 0 to 2 percent slopes:'This very deep, poorly drained, be reduced by properly managing all crop residue and Fnearly level soil is on low alluvial fans. It formed in by minimizing tillage. alluvium derived from granitic rock sources. Mottles in This unit is suited to irrigated pasture. The main the profile indicate a poorly drained soil; however, limitations are the low available water capacity and theFj drainage has been improved by levees and reclamation high water table. Because the soil is droughty, projects. Elevation is 20 to 35 feet. The average annual applications of irrigation water should be light and rprecipitation is about 11 inches, the average annual air frequent.equent. The water can be applied by sprinkler and F"lemperature is about 60 degrees F, and the average border methods. A drainage system may be needed. frost-free period is about 260 days. Proper stocking rates, pasture rotation, and restricted Typically, the surface layer is gray loamy coarse grazing during wet periods helpto keep the a p pasture in -sand about 11 inches thick. The underlying material to a good condition and protect the soil from compaction. depth of 60 inches is mottled light gray and light If this unit is used for homesite development, the brownish gray loamy coarse sand. in some areas the main limitations are the high water table and the rapid surface layer is loamy sand. permeability. The rare flooding is a hazard. A drainage Included in this unit are small areas of Grangeville, system is needed if roads or building foundations are `Manteca, and Veritas soils. Grangeville soils are in constructed. Community sewage systems may be *landscape positions similar to those of the Bisgani soil. needed because seepage from onsite sewage disposal Manteca and Veritas soils are in the slightly higher systems can result in the contamination of water F.positions. Also included, in filled ponds or swamps, are supplies. Houses, roads, and streets should be small areas of soils that have a stratified moderately constructed above expected flood levels. coarse textured to moderately fine textured substratum. This map unit is in capability units Illw-4 (MLRA-17), Included areas make up about 15 percent of the total irrigated, and IVw-4 (MLRA-17), nonirrigated. It is in acreage. vegetative soil group B. Permeability is rapid in the Bisgani soil. Available water capacity is low. The effective rooting depth of the 710—Boggiano clay loam, 0 to 2 percent slopes. crops commonly grown in the county is limited by a This moderately well drained, nearly level soil is on low perched water table that has been lowered to a depth of fan terraces. It is deep to a hardpan. It formed in 3.5 to 5.0 feet through drainage systems that require alluvium derived from mixed rock sources. A few areas Fcontinual maintenance. Runoff is very slow, and the are dissected by intermittent sloughs that have been pazard of water erosion is slight. The rate of water filled as a result of land leveling. Elevation is 45 to 150 intake in irrigated areas is 3.0 inches per hour. The feet. The average annual precipitation is about 16 Fhazard of soil blowing is severe. The soil is subject to inches, the average annual air temperature is about 60 rare flooding, which occurs during years of abnormally degrees F, and the average frost-free period is about high precipitation. 270 days. F. a