SU0004625 SSCRPT - Laserfiche WebLink

Home Browse Search

uin County, California — 117 a 'ize the risk of erosion. All tillage should be on Exeter soils on terraces. Also included are small areas r or across the slope. If the soils are plowed of San Joaquin soils that have slopes of 2 to 8 percent. -,off and erosion can be controlled by applying Included areas make up about 15 percent of the total and seeding a cover crop. Returning crop acreage. o the soil or regularly adding other organic Permeability is very slow in the San Joaquin soil. mproves fertility, minimizes crusting, and Available water capacity is moderate. The shrink-swell s the rate of water intake. potential is high. The effective rooting depth is limited it is suited to irrigated pasture. The main by the hardpan at a depth of 20 to 40 inches. Roots are the low available water capacity. General restricted to cracks and the faces of peds in the Ment considerations include the hazard of claypan, which is at a depth of 20 to 30 inches. Water ,"Because the soil is droughty, applications of is briefly perched above the claypan and hardpan after r water should be light and frequent. The water periods of heavy rainfall or irrigation. Runoff is ponded applied by sprinkler and border methods. in the small vernal pools, is very slow or ponded in the eId preparation should be on the contour or leveled areas, and is slow on the convex slopes. The the slope where practical. Proper stocking rates, hazard of water erosion is slight. The rate of water .'rotation, and restricted grazing during wet intake in irrigated areas is 1 .0 inch per hour. s help to keep the pasture in good condition and Most areas are used for livestock grazing or for ,the soil from erosion. irrigated pasture, irrigated crops, or vineyards. A few re this unit is used for dryland grain crops, the areas are used for dryland grain crops or for homesite mitation is low rainfall during the growing season. development. This unit may provide wetland functions al management considerations include the hazard and values. These should be considered in plans for `ion. Because the amount of precipitation is not enhancement of wildlife habitat or land use conversion. ent for annual cropping, the best suited cropping Where this unit is used for livestock grazing, general t is one that includes small grain and summer management considerations include saturated soil VAII tillage should be on the contour or across the conditions in concave areas following rainy periods. The '':Leaving crop residue on or near the surface characteristic plant community is mainly soft chess, 3o conserve moisture, maintain tilth, and control ripgut brome, foxtail fescue, and filaree. Grazing should n be delayed until the soil is firm enough to withstand s map unit is in capability unit IVe-3 (MLRA-17), trampling by livestock and the more desirable forage ted and nonirrigated. It is in vegetative soil group plants have had an opportunity to set seed. This unit is suited to irrigated pasture. The main limitation is the complex slopes. Leveling helps to O—San Joaquin loam, thick surface, 0 to 2 ensure a uniform application of water. The water can be e,nt slopes. This moderately well drained, nearly applied by sprinkler and border methods. Proper 'soil is on low terraces. It is moderately deep to a stocking rates, pasture rotation, and restricted grazing • an. It formed in alluvium derived from granitic rock during wet periods help to keep the pasture in good ces. The native vegetation is mainly annual condition and protect the soil from compaction. ses, (orbs, and scattered California white oak. A This unit is suited to irrigated row, field, and vineyard reas are dissected by intermittent sloughs that crops. The main limitations are the complex slopes and -been filled as a result of land leveling. Meandering depth to the very slowly permeable claypan and ageways and closed depressions fill with water to hardpan. Leveling helps to ensure a uniform application vernal pools during the winter in many areas. of water. Because of the restricted permeability, the ation is 20 to 110 feet. The average annual applications should be regulated so that the water does cOtation is about 16 inches, the average annual air not stand on the surface and damage the crops. The verature is about 61 degrees F, and the average hardpan limits the suitability for deep-rooted crops. -!.free period is about 275 days. Where feasible, deep ripping of this restrictive layer can ypically, the surface layer is pinkish gray loam help to overcome this limitation. A tillage pan forms ut 12 inches thick. The upper 14 inches of the easily if the soil is tilled when wet. Chiseling or sOil is brown sandy clay loam. The next 9 inches is subsoiling breaks up the pan. Furrow, border. and aypan of brown clay. The lower part to a depth of 60 sprinkler irrigation systems are suitable. Returning crop "es is a brown and light brown, indurated hardpan. residue to the soil or regularly adding other organic 'ome areas the surface layer is fine sandy loam or material improves fertility, minimizes crusting, and dy loam. increases the rate of water intake. Included in this unit are small areas of Bruella and Where this unit is used for dryland grain crops. the