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Soil Survey i14 FI1 annual cropping, the best suited cropping system is one aosetPons s milath of 12 a to those of the San Joaquin20 inches and are in asoil. th t includes small grain and summer fallow. P M:intaining crop residue on or near the surface helps to Included areas make up about 15 percent of the total prevent excessive runoff and helps to maintain tilth and acreage.Permeability is very slow in the San Joaquin soil. the organic matter content. ' Available water capacity is very low. The shrink-swell If this unit is used for homesite development, the main limitations are depth to the very slowly permeable potential is high. The effective rooting depth is limited potential, by the hardpan at a depth of 20 to 40 inches. Roots are claypan and hardpan, the high shrink-swell p ;, a d low strength in the claypan. On sites for septic tank restricted to cracks and the faces of pods in the F:� absorption fields, the very slow permater Cl: eability can beield sl beef y perched above ehte claypan anh of 10 to nd hardpan anf after .: F overcome by increasing the size of the absorption P dy material, and installing backfilling the trench with sanperiods of heavy rainfall or irrigation. Runoff is slow or Iong absorption lines. Ripping the hardpan improves medium, and the hazard of water erosion is slight or permeability and thus also improves the suitability of the moderate. The rate of water intake in irrigated areas is N sil for septic tank absorption fields. Excavation for 1.5 inches per hour. buildings is limited by the hardpan. Properly designing :Most areas are used for livestock grazing. A few foundations and footings and diverting runoff away from areas are used for irrigated vineyards, irrigated pasture,-W age caused or dryland grain crops. This unit may provide wetland buildings help to prevent the structural dam by shrinking and swelling. Properly designing buildings functions and values. These should be considered in and roads can offset the limited ability of the soil to plans for enhancement of wildlife habitat or land use `R4 support a load. conversion. ; ;. This map unit is in capability unit IVs-3 (MCRA-17), Where this unit is used for livestock grazing, general:......._� i�rigated and nonirrigated. It is in vegetative soil group management considerations include saturated soil �. I F p conditions in concave areas following rainy periods and], the hazard of erosion. The characteristic plant s 237---San Joaquin sandy loam, 2 to 5 percent community is mainly soft chess, ripgut brume, foxtail lopes. This moderately well drained, undulating soil is fescue, and filaree. Grazing should be delayed until the on dissected terraces. It is moderately deep to a soll is firm enough to withstand trampling by livestock f hardpan. It formed in alluvium derived from granitic rock and the more desirable forage plants have had an -$.,.:. sources. The native vegetation is mainly annual opportunity to set seed. Grazing should be controlled so ; grasses, forbs, and scattered California white oak. that desirable vegetation, such as soft chess, is Slopes occur as a complex of plane and convex side maintained and enough,vegetation is left standing to y. slopes and concave drainageways. Elevation is 20 to protect the soil from erosion. g Y p 150 feet. The average annual precipitation is about 16 This unit is suited to irrigated vineyard crops. The r inches,'the averageannual air temperature is about 61 main limitations are depth to the very slowly permeable degrees F, and the average frost-free period is about claypan and hardpan and the very low available water capacity. General management considerations include i 275 days. Typically, the surface layer is brown sandy loam the hazard of erosion. Because of the restricted about 10 inches thick. The upper part of the subsoil is a permeability, water applications should be regulated sod er that the water does not stand on the surface and claypan of brown clay about 10 inches thick. The low part to a depth of 60 inches is a brown and light brown, damage the crops. The hardpan limits the suitability for: indurated hardpan. In some areas the surface layer is deep-rooted crops. Where feasible, deep ripping of this` - restrictive layer can help to overcome this limitation. A fine sandy loam. Included in this unit are small areas of Bruella and tillage pan forms easily if the soil is tilled when wet, Rocklin soils on the slightly higher terraces, Jahant soils Chiseling or subsoiling breaks up the pan. Because ihe. = ' soil is droughty, applications of irrigation water should: in landscape positions similar to those of the San I Joaquin soil, Madera soils in the slightly lower positions, be light and frequent. Sprinkler and drip irrigation FF and San Joaquin soils that have slopes of 0 to 2 or 8 to systems are suitable. They permit an even, controlled j I help to prevent excessive runoff;;: 15 percent. The areas where slopes are 0 to 2 percent application of water, l are on toe slopes, and the areas where slopes are 8 to and minimize the risk of erosion. All tillage should be fly' 11 15 percent are on narrow embankments. Also included the contour or across the slope. if the soil is plowed Vin` „ are small areas of Redding soils that have slopes of 2 fall, runoff and erosion can be controlled by applying.. 'k to 8 percent and are on the slightly higher terraces and fertilizer and seeding a cover crop. Returning crop p anis r ` moderately coarse textured soils that have a hardpan at residue to the soil or regularly adding other org ` I 'ri