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61 -n Joaquin County, California 159—Fluvaquents, 0 to 2 percent slopes, Included in this unit are small areas of Archerdale frequently flooded. These very deep, poorly and very and Vignolo soils on the slightly higher parts of the poorly drained, l bars level inoils are on low tidal marshes onood del alsins positions similar to thoseand of theStockton Galt soil,soils and Peltier landscape and interchannel b sediments derived from mixed soils in the slightly lower landscape positions. Also They formed in mineral rock sources d d les. Elevatioin nic isnt remains feet below sea level moinclderately coarse are small textured moderatelyoralfine textured from reeds a to 5 feet above. The average annual precipitation is overburden and are on the slightly higher parts of the scape and Galt about 14 inches,degrees F andrt theannual air average frost-free ee periodperature sis saline sodic and aresnlls that are highly landscape positions similar tor about 60 deg those of the dominant Galt soil. Included areas make up about 270 days. Typically, the surface layer is gray, mottled silty clay about 15 percent of the total acreage. loam about 14 inches thick. The underlying material to a Permeability is slow in the Galt soil. Available water depth of 60 inches is stratified gray, dark gray, and capacity is low. The shrink-swell potential is high. The olive, mottled fine sandy loam, silt loam, and silty clay effective rooting depth is limited by the hardpan at a loam. In some areas the surface layer is mucky loam or depth of 20 to 40 inches. Depth to the water table is cla loam. more than 6 feet, but water may be very briefly perched mucky Y Included in this unit are small areas of Columbia, above the hardpan after periods of heavy rain a or Kingile, Peltier, and Ryde soils on the slightly higher irrigation. Runoff is slow, and the hazard of water parts of the landscape. Included areas make up about erosion areas is slight. per ratehouof watesoril ns subject in irrigated e 15 percent of the total acreage. Permeability is slow to moderately rapid in the flooding, which occurs during years of abnormally high Fluvaquents. Available water capacity is low to high. precipitation. e effective rooting depth is limited by an apparent Most areas are used for irrigated crops. A few areas ..ater table at a depth of 6 to 24 inches throughout the are used as irrigated pasture or for homesite year. Runoff is very slow, and the hazard of water development. This unit may provide wetland functions erosion is slight. These soils are subject to frequent, and values. These should be considered in plans for long periods of flooding from November through April. enhancement of wildlife to ihabitat or land and f e d c veuse rsion. Channeling and deposition are common along streambanks. The main limitations are the slow permeability, the low This unit is used mainly for wildlife habitat. It may available water capacity, and depth to the hardpan. provide wetland functions and values. These should be Because of the restricted permeability, water considered in plans for enhancement of wildlife habitat applications should be regulated so that the water does or land use conversion. not stand on the surface and damage the crops. This map unit is in capability subclass Vllw Because the soil is droughty, applications of irrigation (MCRA-16), nonirrigated. It is in vegetative soil group E water should b he su tab I ty forlight and frequent. The deep-deep-rooted crops. Where feasibepan ,ts 160--Galt clay, 0 to 2 percent slopes. This deep ripping of this restrictive layer can help to moderately well drained, nearly level soil is on basin overcome this limitation. The soil should be cultivated rims and in basins. It is moderately deep to a hardpan. only within a narrow range of moisture content. It is too It formed in alluvium derived from mixed rock sources. sticky when wet and too hard when dry. Furrow, border, A few areas are dissected by intermittent sloughs that and sprinkler irrigation systems are suitable. Returning have been filled as a result of land leveling. Elevation is crop residue to the soil or regularly adding other organic 20 to 100 feet. The average annual precipitation is material improves fertility, minimizes crusting, and about 14 inches, the average annual air temperature is increases the rate of water intake. about 60 degrees F, and the average frost-free period is This unit is suited to irrigated pasture. Irrigation water about 270 days. can be applied by sprinkler and border methods. Typically, the surface layer is grayish brown and dark Leveling helps to ensure a uniform application of water. -1rayish brown clay about 25 inches thick. The upper 9 Proper stocking rates, pasture rotation, and restricted .fiches of the subsoil is dark grayish brown clay. The grazing during wet periods help to keep the pasture in lower part to a depth of 60 inches is a variegated light good condition and protect the soil from compaction. yellowish brown, dark grayish brown, and white, weakly If this unit is used for homesite development, the cemented hardpan. In some areas the surface layer is main limitations slow permeability,high shrink- riand- depth oo thswell tial, low silty clay. f