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108 Soil Survey management considerations include saturated soil buildings increases the hazard of erosion. conditions in concave areas following rainy periods. The This map unit is in capability units Ille-8 (MLRA-17), characteristic plant community is mainly soft chess, irrigated, and IVe-8 (MLRA-17), nonirrigated. It is in ripgut brome, wild oat, and filaree. Grazing should be vegetative soil group G. delayed until the soil is firm enough to withstand trampling by livestock and the more desirable forage 229—Rocklin fine sandy loam, 0 to 2 percent plants have had an opportunity to set seed. slopes. This moderately well drained, nearly level soil i; Where this unit is used for dryland grain crops, the on dissected terraces that have been leveled. It is main limitation is low rainfall during the growing season. moderately deep to a hardpan. It formed in old alluvium General management considerations include the hazard derived from granitic rock sources. In most areas slope. of erosion. Because the amount of precipitation is not originally were 2 to 5 percent before extensive land sufficient for annual cropping, the best suited cropping leveling. Elevation is 80 to 250 feet. The average system is one that includes small grain and summer annual precipitation is about 16 inches, the average fallow. All tillage should be on the contour or across the annual air temperature is about 61 degrees F, and the slope. Leaving crop residue on or near the surface average frost-free period is about 275 days. helps to conserve moisture, maintain tilth, and control Typically, the surface layer and the upper part of the erosion. subsoil are pale brown and light brown fine sandy loarr This unit is suited to irrigated vineyard crops. The about 25 inches thick. The next 11 inches of the subso main limitations are depth to the hardpan and the low is light brown sandy clay loam. The lower part is a light available water capacity. General management brown, indurated hardpan about 4 inches thick. The considerations include the hazard of erosion. The underlying material to a depth of 60 inches is reddish hardpan limits the suitability for deep-rooted crops. yellow, dense, weakly cemented sandy loam. In some Where feasible, deep ripping of this restrictive layer can areas the surface layer is loam. help to overcome this limitation. A tillage pan forms Included in this unit are small areas of Bruella and easily if the soil is tilled when wet. Chiseling or San Joaquin soils on terraces and Hicksville soils in subsoiling breaks up the pan. Because the soil is drainageways. Also included, in landscape positions droughty, applications of irrigation water should be light similar to those of the dominant Rocklin soil, are and frequent. Sprinkler and drip irrigation systems are moderately coarse textured soils that have a hardpan suitable. They permit an even, controlled application of a depth less than 20 inches, small areas of Rocklin water, help to prevent excessive runoff, and minimize soils that have slopes of 2 to 5 percent, and moderate: the risk of erosion. All tillage should be on the contour coarse textured soils that have a hardpan at a depth o or across the slope. If the soil is plowed in fall, runoff more than 40 inches. Included areas make up about 1 and erosion can be controlled by applying fertilizer and percent of the total acreage. seeding a cover crop. Returning crop residue to the soil Permeability is moderate in the Rocklin soil. Availat or regularly adding other organic material improves water capacity is low. The effective rooting depth is fertility, minimizes crusting, and maintains the rate of limited by the hardpan at a depth of 20 to 40 inches. water intake. Water is briefly perched above the hardpan after This unit is suited to irrigated pasture. The main periods of heavy rainfall or irrigation. Runoff is very limitation is the low available water capacity. General slow, and the hazard of water erosion is slight. The ra management considerations include the hazard of of water intake in irrigated areas is 1.5 inches per hou erosion. Because the soil is droughty, applications of Most areas of this unit are used for irrigated crops, irrigation water should be light and frequent. The water irrigated pasture, or homesite development. can be applied by sprinkler and border methods. This unit is suited to irrigated row, field, and vineya Seedbed preparation should be on the contour or crops. The main limitations are depth to the hardpan across the slope where practical. Proper stocking rates, and the low available water capacity. The hardpan lim pasture rotation, and restricted grazing during wet the suitability for deep-rooted crops. Where feasible, periods help to keep the pasture in good condition and deep ripping of this restrictive layer can help to protect the soil from erosion. overcome this limitation. Because the soil is droughty, If this unit is used for homesite development, the applications of irrigation water should be light and main limitation is depth to the hardpan. General frequent. Furrow, sprinkler, and drip irrigation system: management considerations include the hazard of are suitable. Returning crop residue to the soil or erosion. Ripping the hardpan improves permeability and regularly adding other organic material improves fertil thus also improves the suitability of the soil for septic minimizes crusting, and maintains the rate of water tank absorption fields. Excavation for roads and intake.