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� u 6, . San Joaquin County. California ,.desirable forage plants. Grazing should be delayed until Runoff is slow or medium, and the hazard of water the soils are firm enough to withstand trampling by erosion is slight or moderate. liveoppokrtuniitythe to ettmore seed.desirable cing is difficult becauselants have had andThe is moderately soil well drained. It formed in alluvium hardpan �Orl oPP derived from mixed rock sources. Typically, the surface of the depth to bedrock. This map unit is in capability subclass Vle layer is light brown, strong brown, and reddish yellow (MLRA-17), nonirrigated. The Keyes soil is in vegetative gravelly loam about 16 inches thick. The upper part of -soil group G. and the Bellota soil is in vegetative soil the subsoil is a claypan of reddish brown clay about 6 inches thick. The lower part to a depth of 60 inches is a group D. reddish yellow, indurated hardpan. In some areas the 188—Keyes-Redding complex, 2 to 8 percent surface layer is gravelly sandy loam, cobbly loam, or slopes. These undulating and gently rolling soils are on loam. hills. The native vegetation is mainly Permeability is very slow in the Redding soil. annual grasses and fortis. Elevation -swell high terraces and is 125 to 200 feet. Available water capacity is very low. The shrink ` potential is high. The effective rooting depth is limited The average annual precipitation is about 17 inches, the average annual air temperature is about 60 degrees by the hardpan at a depth of 20 to 40 inches. Roots are F, and the average frost-free period is about 270 days. restricted to cracks and the faces of peds in the This unit is 45 percent Keyes gravelly loam and 40 claypan, which is at a depth of 16 to 36 inches. Water percent Redding gravelly loam. The Redding soil is on is briefly perched above the claypan after periods of concave or convex slopes, and the Keyes soil is on heavy rainfall. Runoff is slow or medium, and the concave slopes. The components of this unit occur as hazard of water erosion is slight or moderate. areas so intricately intermingled that it was not practical This unit is used mainly for livestock grazing. General to map them separately at the scale used. management considerations include the hazard of Included in this unit are small areas of Bellota soils erosion in rolling areas, the very low available water and small areas of Redding soils that have slopes of capacity, saturated soil conditions in concave areas more than 8 percent. Both of these included soils are in following rainy periods, and the limited depth of the landscape positions similar to those of the dominant Keyes soil. The characteristic plant community is mainly .. Keyes and Redding soils. Also included are small areas soft chess, wild oat, and filaree on the Keyes soil and of Pardee soils on terraces, Peters soils in the slightly soft chess, ripgut brome, wild oat, and filaree on the lower landscape positions, and soils that have clay at Redding soil. Grazing should be controlled so that the surface. Included areas make up 15 percent of the desirable vegetation, such as soft chess, is maintained total acreage. and enough vegetation is left standing to protect the The Keyes soil is shallow to a hardpan and is soils from erosion. The very low available water moderately well drained. It formed in alluvium derived capacity limits the production of desirable forage plants. from mixed rock sources and in material weathered Grazing should be delayed until the soils are firm from basic andesitic, tuffaceous sandstone. Typically, enough to withstand trampling by livestock and the the surface layer is grayish brown gravelly loam about 6 more desirable forage plants have had an opportunity to inches thick. The upper part of the subsoil is a claypan set seed. Fencing is difficult because of the depth to of brown gravelly clay about 7 inches thick. The lower bedrock. part is a yellowish brown, moderately cemented This map unit is in capability subclass Vle hardpan about 21 inches thick. Light gray, weakly (MLRA-17), nonirrigated. The Keyes soil is in vegetative consolidated, basic andesitic, tuffaceous sandstone soil group G, and the Redding soil is in vegetative soil bedrock is at a depth of 34 inches. In some areas the group D. surface layer is loam, cobbly loam, or gravelly sandy 189—Kingdon fine sandy loam, 0 to 2 percent loam. Permeability is very slow in the Keyes soil. Available slopes. This very deep, moderately well drained, nearly water capacity is very low. The shrink-swell potential is level soil is on low fan terraces. It formed in alluvium high. The effective rooting depth is limited by the derived from granitic rock sources. A few areas are hardpan, which is at a depth of 10 to 20 inches and is dissected by intermittent sloughs that have been filled underlain by bedrock. Roots are restricted to cracks and because of land leveling. Elevation is 10 to 150 feet. the faces of eds in the claypan, l air temperature is about 60 degrees which is at a depth of The average annual precipitation is about 15 inches, ^ 6 to 17 inches. Water is briefly perched above the the average annual claypan and hardpan after periods of heavy rainfall. F, and the average frost-free period is about 260 days.