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5 \OZ- Soil Survey San �oaquin County, California ti 22 Redding gravelly loam, 2 to 8 percent slopes. This moderately well drained, undulating and gently hazard of erosion, and the very low available water roiling.soil is on high terraces. It is moderately deep to capacity. The characteristic plant community is mainly a hardpan. It formed in alluvium derived from mixed ,it chess, ripgut brome, foxtail fescue, and filaree. rock sources. The native vegetation is mainly annual Grazing should be delayed until the soil is firm enough grasses and forbs. Slopes are complex, and the to withstand trampling by livestock and the more landscape is characterized by hummocky microrelief. desirable forage plants have had an opportunity to set Elevation is 130 to 300 feet. The average annual seed. Grazing should be controlled so that desirable precipitation is about 17 inches, the average annual air vegetation, such as soft chess, is maintained and temperature is about 60 degrees F, and the average enough vegetation is left standing to protect the soil frost-free period is about 270 days. from erosion. The very low available water capacity Typically, the upper part of the surface layer is strong limits the production of desirable forage plants. brown gravelly loam about 7 inches thick. The lower This unit is suited to irrigated pasture. The main part is reddish yellow gravelly loam about 9 inches limitation is the very low available water capacity. thick. The upper part of the subsoil is a ciaypan of General management considerations include the hazard reddish brown clay about 6 inches thick. The lower part of erosion. Because the soil is droughty, applications of to a depth of 60 inches is a reddish yellow and irrigation water should be light and frequent. The water yellowish red, indurated hardpan. In some areas the can be applied by sprinkler and border methods. surface layer is gravelly sandy loam, cobbly loam, or Seedbed preparation should be on the contour or loam. across the slope where practical. Proper stocking rates, Included in this unit are small areas of Bellota and pasture rotation, and restricted grazing during wet Pardee soils on terraces and shallow, medium textured periods help to keep the pasture in good condition and soils that have a claypan at a depth of 10 to 15 inches protect the soil from erosion. and are in landscape positions similar to the Redding Where this unit is used for dryiand grain crops, the soil. Also included are small areas of Alamo and main limitation is low rainfall during the growing season. Yellowlark soils in drainageways, Pentz soils on the General management considerations include the hazard. slightly higher terraces, Peters soils in the slightly lower of erosion. Because the amount of precipitation is not landscape positions, and Redding soils that have slopes sufficient for annual cropping, the best suited cropping of 8 to 30 percent and are on the slightly higher parts of system is one that includes small grain and summer the landscape. Included areas make up about 15 1 fallow. All tillage should be on the contour or across the percent of the total acreage. slope. Limiting tillage during seedbed preparation and Permeability is very stow in the Redding soil. during the application of weed-control measures helps Available water capacity is very low. The shrink-swell to control runoff and erosion. Leaving crop residue on potential is high. The effective rooting depth is limited or near the surface helps to conserve moisture, by the hardpan at a depth of 20 to 40 inches. Roots are I maintain tilth, and control erosion. restricted to cracks and the faces of peds in the This map unit is in capability unit IVe-3 (MLRA-17), claypan, which is at a depth of 16 to 22 inches. Water ; irrigated and nonirrigated. It is in vegetative soil group is briefly perched above the claypan after periods of j D• heavy rainfall or irrigation. Runoff is slow or medium, and the hazard of water erosion is slight or moderate. 221—Redding gravelly loam, 8 to 30 percent The rate of water intake in irrigated areas is 1.5 inches slopes. This moderately well drained, rolling to per hour. moderately steep soil is on dissected high terraces. It is Most areas are used for livestock grazing. A few moderately deep to a hardpan. It formed in alluvium areas are used as irrigated pasture or for dryland grain i derived from mixed rock sources. The native vegetation crops. This unit may provide wetland functions and ' is mainly annual grasses and forbs. Slopes are values. These should be considered in plans for complex, and the landscape is characterized by enhancement of wildlife habitat or land use conversion. hummocky microrelief. Elevation is 130 to 350 feet. The Where this unit is used for livestock grazing, general average annual precipitation is about 17 inches, the management considerations include saturated soil average annual air temperature is about 60 degrees F, conditions in concave areas following rainy periods, the ana the averaqe frost-free period is about 260 days.