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<br /> Joaquin County, California 117
<br /> San Joaq
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<br /> and minimize the risk of erosion. All tillage should be on Exeter soils on terraces. Also included are small areas
<br /> the contour or across the slope. If the soils are plowed of San Joaquin soils that have slopes of 2 to 8 percent.
<br /> 77`;'�'f in fail, runoff and erosion can be controlled by applying Included areas make up about 15 percent of the total
<br /> ' fertilizer and seeding a cover crop. Returning crop acreage.
<br /> ` residue to the soil or regularly adding other organic Permeability is very slow in the San Joaquin soil.
<br /> 'ma terial improves fertility, minimizes crusting, and Available water capacity is moderate. The shrink-swell
<br /> l increases the rate of water intake. potential is high. The effective rooting depth is limited
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<br /> This unit is suited to irrigated pasture. The main by the hardpan at a depth of 20 to 40 inches. Roots are
<br /> Ilrr�itation is the low available water capacity. General restricted to cracks and the faces of peds in the
<br /> nagement considerations include the hazard of ciaypan, which is at a depth of 20 to 30 inches. Water
<br /> erosion. Because the soil is droughty, applications of is briefly perched above the ciaypan and hardpan after
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<br /> Irrigation water should be light and frequent. The water periods of heavy rainfall or irrigation. Runoff is ponded
<br /> u�f.can be applied by sprinkler and border methods. in the small vernal pools, is very slow or ponded in the
<br /> Seedbed preparation should be on the contour or leveled areas, and is slow on the convex slopes. The
<br /> ;across the slope where practical. Proper stocking rates, hazard of water erosion is slight. The rate of water
<br /> �4pasture rotation, and restricted grazing during wet intake in irrigated areas is 1.0 inch per hour.
<br /> t -periods help to keep the pasture in good condition and Most areas are used for livestock grazing or for
<br /> [;�',protect the soil from erosion. irrigated pasture, irrigated crops, or vineyards. A few
<br /> -�- '.Where this unit is used for dryland grain crops, the areas are used for dryland grain crops or for homesite
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<br /> main limitation is low rainfall during the growing season, development. This unit may provide wetland functions
<br /> General management considerations include the hazard and values. These should be considered in pians for
<br /> of.erosion. Because the amount of precipitation is not enhancement of wildlife habitat or land use conversion.
<br /> sufficient for annual cropping, the best suited cropping Where this unit is used for livestock grazing, general
<br /> v system is one that includes small grain and summer management considerations include saturated soil
<br /> -fallow, All tillage should be on the contour or across the conditions in concave areas following rainy periods. The
<br /> i "-€slope. Leaving crop residue on or near the surface characteristic plant community is mainly soft chess,
<br />' F ,,helps to conserve moisture, maintain tilth, and control ripgut brome, foxtail fescue, and filaree. Grazing should
<br /> �eroslon. be delayed until the soil is firm enough to withstand
<br /> This map unit is in capability unit IVe-3 (MLRA-17), trampling by livestock and the more desirable forage
<br /> -irrigated and nonirrigated. It is in vegetative soil group plants have had an opportunity to set seed.
<br /> This unit is suited to irrigated pasture. The main
<br /> limitation is the complex slopes. Leveling helps to
<br /> y : 240—San Joaquin loam, thick surface, 0 to 2 ensure a uniform application of water. The water can be
<br /> C: �: percent slopes. This moderately well drained, nearly applied by sprinkler and border methods. Proper
<br /> J—"5:'-Ievel soil is on low terraces. It is moderately deep to a stocking rates, pasture rotation, and restricted grazing
<br /> hardpan. It formed in alluvium derived from granitic rock during wet periods help to keep the pasture in good
<br /> sources. The native vegetation is mainly annual condition and protect the soil from compaction.
<br /> grasses, forbs, and scattered California white oak. A This unit is suited to irrigated row, field, and vineyard
<br /> "few-areas are dissected by intermittent sloughs that crops. The main limitations are the complex slopes and
<br /> ; have been filled as a result of land leveling. Meandering depth to the very slowly permeable ciaypan and
<br /> z4,-drainageways and closed depressions fill with water to hardpan. Leveling helps to ensure a uniform application
<br /> Or vernal poo€s during the winter in many areas. of water. Because of the restricted permeability, the
<br /> Elevation is 20 to 110 feet. The average annual applications should be regulated so that the water does
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<br /> precipitation is about 16 inches, the average annual air not stand on the surface and damage the crops. The
<br /> temperature is about 61 degrees F, and the average hardpan limits the suitability for deep-rooted crops.
<br /> frost free period is about 275 days. Where feasible, deep ripping of this restrictive layer can
<br /> Typically, the surface layer is pinkish gray loam help to overcome this limitation. A tillage pan forms
<br /> about 12 inches thick. The upper 14 inches of the easily if the soil is tilled when wet. Chiseling or
<br /> fQsubsoil is brown sandy clay loam. The next 9 inches is subsoiling breaks up the pan. Furrow, border, and
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<br /> r a claypan of brown clay. The lower part to a depth of 60 sprinkler irrigation systems are suitable. Returning crop
<br /> i�?ches is a brown and light brown, indurated hardpan. residue to the soil or regularly adding other organic
<br /> .In some areas the surface layer is fine sandy loam or material improves fertility, minimizes crusting, and
<br /> 1 =sandy loam-
<br /> rg. increases the rate of water intake.
<br /> included in this unit are small areas of Bruella and Where this unit is used for dryland grain crops, the
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