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San Joaquin County, California 85
<br /> F. characteristic plant community is mainly soft chess, formed in alluvium derived from granitic rock sources.
<br /> foxtail fescue, and filaree. Grazing should be delayed Slopes occur as a complex of plane and convex side
<br /> until the soil is firm enough to withstand trampling by slopes and concave drainageways. The native
<br /> livestock and the more desirable forage plants have had vegetation is mainly annual grasses and forbs.
<br /> Fan oppo lunity to set seed. Elevation is 60 to 150 feet. The average annual
<br /> This L nit is suited to irrigated pasture. The main precipitation is about 14 inches, the average annual air
<br /> jimitatior s are the complex slopes and the low available temperature is about 61 degrees F, and the average
<br /> water capacity. Leveling helps to ensure a uniform frost-free period is about 275 days.
<br /> ";appiicati n of water. Because the soil is droughty, Typically, the surface layer is brawn loam about 10
<br /> " -applicati ns of irrigation water should be light and inches thick. The upper part of the subsoil is a claypan
<br /> Ffrequent The water can be applied by sprinkler and of light reddish brown clay about 20 inches thick. The
<br /> border methods, Proper stocking rates, pasture rotation, lower part to a depth of 60 inches is a brown and light
<br /> _':and restricted grazing during wet periods help to keep brown, indurated, silica-cemented hardpan. In some
<br /> the
<br /> pasture in good condition and protect the soil from areas the surface layer is sandy loam.
<br /> compac#ion. Included in this unit are small areas of Exeter,
<br /> This unit is suited to irrigated row, field, and vineyard Jahant, and San Joaquin soils in landscape positions
<br /> k<cops. The main limitations are the complex slopes, similar to those of the Madera soil. Also included, on
<br /> f depth to he very slowly permeable claypan and toe slopes, are small areas of Madera soils that have
<br /> Hardpan, and the low available water capacity. Leveling slopes of 0 to 2 percent. Included areas make up about
<br /> t' fiheIps to nsure a uniform application of water. The 15 percent of the total acreage.
<br /> '46,'Bedpan imits the suitability for deep-rooted crops. Permeability is very slow in the Madera soil.
<br /> ,Where fe sible, deep ripping of this restrictive layer can Available water capacity is low. The shrink-swell
<br /> �help'to o ercome this limitation. A tillage pan forms potential is high. The effective rooting depth is limited
<br /> easily if tie soil is tilled when wet. Chiseling or by the hardpan at a depth of 20 to 40 inches. Roots are
<br /> SU s iling breaks up the pan. Because the soil is restricted to cracks and the faces of peds in the
<br /> droughty, applications of irrigation water should be light claypan, which is at a depth of 10 to 25 inches. Water
<br /> and freq ent Furrow, border, and sprinkler irrigation is briefly perched above the claypan and hardpan after
<br /> systems re suitable. Returning crop residue to the soil periods of heavy rainfall or irrigation. Runoff is slow or
<br /> oregula ly adding other organic material improves medium, and the hazard of water erosion is slight or
<br /> :fertility; inimizes crusting, and maintains the rate of moderate. The rate of water intake in irrigated areas is
<br /> vi+ater Int take. .
<br /> I ','unit is used for homesite development, the
<br /> 1.0 inch per hour. The soil is not subject to flooding.
<br /> thMost areas are used for livestock grazing. A few
<br /> in hmi ations are depth to the very slowly permeable areas are used for irrigated vineyards, for irrigated
<br /> claypan``nd hardpan, the high shrink-swell potential, pasture, or for homesite development. This unit may
<br /> a law "trength in the clayey subsoil..On sites for provide wetland functions and values. These should be
<br /> Septic tank absorption fields, the very slow permeability considered in plans for enhancement of wildlife habitat
<br /> an'be�a; ercorhe by increasing the size of the or land use conversion.
<br /> absorptio field, backfilling the trench with sandy Where this unit is used for livestock grazing, general
<br /> ;thmaterial,' nd'fnstailing long absorption lines. Ripping management considerations include saturated soil
<br /> hara n roves permeability and thus also
<br /> Impro Y conditions in concave areas following rainy periods. The
<br /> suitability of the soil for septic tank characteristic plant community is mainly soft chess,
<br /> �bYhabsorptio fields; Excavation for building sites is limited foxtail fescue, and filaree. Grazing should be delayed
<br /> e ha;dean 'Properly designing foundations and until the soil is firm enough to withstand trampling b
<br /> ' °ot�ngs rid divral erting runoff away from buildings help to livestock and the more desirable forage plants have had
<br /> Prevent t e structudamage Y
<br /> gwellin F ge caused by shrinking and an opportunity to set seed.
<br /> offset 9 , roperly designing buildings and roads can This unit is suited to irrigated vineyard crops. The i
<br /> trithe°I�mrted ability of the soil to support a load. main limitations are depth to the very slowly
<br /> tus m, p unit„Is in capability unit IVs-3 MLRA-17 , p ry y permeable I
<br /> �'.Qated '
<br /> ? claypan and hardpan and the low available water
<br /> ,rid nonirrigated. It is in vegetative soil group capacity. General management considerations include
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<br /> the hazard of erosion. Because of the restricted
<br /> permeability, water applications should be regulated so
<br /> •; cies loam, 2 to 5 percent slopes. This that the water does not stand on the surface and
<br /> swell drained undulating soil is on dissected damage the crops. The hardpan limits the suitability for
<br /> " It is moderately deep to a hardpan. It deep-rooted crops. Where feasible, deep ripping of this
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