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102 Soil Survey i inches is a reddish yellow, indurated, silica-cemented irrigated, and IV5-3 (MLRA-17), nonirrigated. It is in r hardpan. In some areas the surface layer is gravelly or vegetative soil group D. cobbly loam. � Included in this unit are areas of Yellowlark soils in 220—Redoing gravelly loam, 2 to 8 percent slopes, ,. drainageways and shallow, medium textured soils that This moderately well drained, undulatingand gently g Y have a claypan at a depth of 10 to 15 inches and are in rolling soil is on high terraces. It is moderately deep to landscape positions similar to those of the Redding soil. a hardpan. It formed in alluvium derived from mixed Also included, on the slightly higher parts of the rock sources. The native vegetation is mainly annual landscape, are small areas of Redding soils that have grasses and forbs. Slopes are complex, and the F. slopes of 3 to 5 percent. Included areas make up about landscape is characterized by hummocky microrelief. 15 percent of the total acreage. Elevation is 130 to 300 feet. The average annual Permeability is very slow in the Redding soil. precipitation is about 17 inches, the average annual air Available water capacity is low. The shrink-swell temperature is about 60 degrees F, and the average potential is high. The effective rooting depth is limited frost-free period is about 270 days. by the hardpan at a depth of 20 to 40 inches. Roots are Typically, the upper part of the surface layer is strongT restricted to cracks and the faces of peds in the brown gravelly loam about 7 inches thick. The lower claypan, which is at a depth of 20 to 36 inches. Water part is reddish yellow gravelly loam about 9 inches Fis briefly perched above the claypan after periods of thick. The upper part of the subsoil is a claypan of heavy rainfall or irrigation. Runoff generally is very slow reddish brown clay about 6 inches thick. The lower part or slow but is ponded in the small vernal pools. The to a depth of 60 inches is a reddish yellow and hazard of water erosion is slight. The rate of water yellowish red, indurated hardpan. In some areas the intake in irrigated areas is 1.0 inch per hour. surface layer is gravelly sandy loam, cobbly loam, or Most areas are used for livestock grazing. A few loam. areas are used as irrigated pasture. This unit may Included in this unit are small areas of Bellota and provide wetland functions and values. These should be Pardee soils, on terraces and shallow, medium textured considered in plans for enhancement of wildlife habitat soils that have a claypan at a depth of 10 to 15 inches or land use conversion, and are in landscape positions similar to the Redding Where this unit is used for livestock grazing, general soil. Also included are small areas of Alamo and management considerations include saturated soil Yellowlark soils in drainageways, Pentz soils on the conditions in concave areas following rainy periods and slightly higher terraces, Peters soils in the slightly lower the low available water capacity:The characteristic landscape positions, and Redding soils that have slopes .plant community is mainly soft chess, foxtail fescue, of 8 to 30 percent and are on the slightly higher parts of and filaree. Grazing should be delayed until the soil is the landscape. Included areas make up about 15 ' + firm enough to withstand trampling by livestock and the percent of the total acreage. } more desirable forage plants have had an opportunity to Permeability is very slow in the Redding soil. set seed. The low available water capacity limits the Available water capacity is very low. The shrink-swell production of desirable forage plants. The unit responds potential is high. The effective rooting depth is limited well to range improvement practices, such as seeding by the hardpan at a depth of 20 to 40 inches. Roots are j and applying fertilizer. The plants selected for seeding restricted to cracks and the faces of peds in the should be those that meet the seasonal requirements of claypan, which is at a depth of 16 to 22 inches. Water livestock, wildlife, or both. After seeding is complete, is briefly perched above the claypan after periods of ;. grazing should be deferred until the plants have set heavy rainfall or irrigation. Runoff is slow or medium, seed. and the hazard of water erosion is slight or moderate. Where this unit is used as irrigated pasture, the main The rate of water intake in irrigated areas is 1.5 inches limitation is the low available water capacity. Because per hour. the soil is droughty, applications of irrigation water Most areeis are used for livestock grazing. A few should be light and frequent. The water can be applied areas are used as irrigated pasture or for dryland grain 14 by sprinkler and border methods. Leveling helps to crops. This unit may provide wetland functions and ensure a uniform application of water. Proper stocking values_ These should be considered in plans for rates, pasture rotation, and restricted grazing during wet enhancement of wildlife habitat or land use conversion. periods help to keep the pasture in good condition and Where this unit is used for livestock grazing, general protect the soil from compaction. management considerations include saturated soil This map unit is in capability units Ills-3 (MLRA-17), conditions in concave areas following rainy periods, the F'