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F 70 Soil Survey i clay loam and brown very gravelly sandy loam. In some minimizes crusting, and increases the rate of water areas the surface layer is loam. intake. Included in this unit are small areas of Yeilowlark This map unit is in capability units Ilw-2 (MLRA-17), i soils on the slightly higher parts of the landscape and irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in ` soils that are similar to the Hicksville soil but have a vegetative soil group A. subsoil that is very gravelly and moderately fine : I textured or gravelly and fine textured or moderately 173—Hollenbeck silty clay, 0 to 2 percent slopes. coarse textured. Also included are Redding and Rocklin This moderately well drained, nearly level soil is in ,k r soils on the higher terraces. Included areas make up interfan basins. It is deep to a hardpan. It formed in i about 15 percent of the total acreage. alluvium derived from mixed rock sources. A few areas Permeability is moderately slow in the Hicksville soil. are dissected by intermittent sloughs that have been Available water capacity is moderate. The effective filled as a result of land leveling. Elevation is 20 to 100 rooting depth is 60 inches or more. Depth to an feet. The average annual precipitation is about 14 I apparent water table is 5 to 6 feet. Runoff is very slow inches, the average annual air temperature is about 60 r or slow, and the hazard of water erosion is slight. The degrees F, and the average frost-free period is about r 1 rate of water intake in irrigated areas is 1.0 inch per 270 days. hour. The soil is subject to occasional very brief Typically, the surface layer is grayish brown silty cla Y periods of flooding from December through April. about 10 inches thick. The upper 27 inches of the r Streambank erosion occurs along many of the subsoil is brown and yellowish brown clay. The next 5 meandering drainageways. inches is grayish brown silty clay loam. The lower part _ r Most areas are used for livestock grazing. A few to a depth of 60 inches is a variegated light yellowish u areas are used for irrigated crops. This unit may brown, weakly cemented to strongly cemented hardpan-::. t provide wetland functions and values. These should be In some areas the surface la m. p layer is clay or clay loa Y considered in plans for enhancement of wildlife habitat Included in this unit are small areas of Archerdale, 50.` _. K or land use conversion. Cogna, and Vignolo soils on the slightly higher parts of t Where this unit is used for livestock grazing, general the landscape, Stockton and Galt soils in landscape r ' management considerations include the hazard of positions similar to those of the Hollenbeck soil, and "t '^'c. occasional flooding and saturated soil conditions in Guard soils in the slightly lower landscape positions. concave areas following rainy periods. The Also included are small areas of Hollenbeck soils that characteristic plant community is mainly soft chess, wild are highly calcareous or saline-sodic throughout. 1 oat, ripgut brome, and filaree. The grazing system may Included areas make up about 15 percent of the total be impaired by the occasional flooding. Grazing should acreage. r i' be delayed until the soil is firm enough to withstand Permeability is slow in the Hollenbeck soil. Available� trampling by livestock and the more desirable forage water capacity is moderate. The shrink-swell potential is plants have had an opportunity to set seed. The unit high. The effective rooting depth is limited by the responds well to range improvement practices, such as hardpan at a depth of 40 to 60 inches. Depth to the seeding and applying fertilizer. The plants selected for water table is more than 6 feet, but water may be briefly Xa:=:`s seeding should be those that meet the seasonal perched above the hardpan after periods of heavy f` requirements of livestock, wildlife, or both. After seeding rainfall or irrigation. Runoff is slow, and the hazard of x is complete, grazing should be deferred until the plants water erosion is slight. The rate of water intake in have set seed. irrigated areas is 0.1 inch per hour. The soil is subject' a This unit is suited to irrigated row, field, vineyard, and to rare flooding, which occurs during years of •'7 `tt orchard crops. General management considerations abnormally high precipitation. F , include the hazard of occasional flooding and the Most areas are used for irrigated crops or orchards gravelly subsoil. Most climatically adapted crops can be A few areas are used as irrigated pasture or for ;z` grown ;f the soil is protected from flooding late in spring homesite development. This unit may provide wetland ;° and early in summer and if a drainage system is functions and values. These should be considered in a, '=,'te installed. The risk of flooding can be reduced by levees plans for enhancement of wildlife habitat or land use ^s, and diversions. Leveling for irrigation may expose the conversion. j gravelly subsoil. Careful applications of irrigation water This unit is suited to irrigated row, field, and orchard s are needed to prevent the buildup of a high water table. crops. The main limitations are the slow permeability Furrow, border, and sprinkler irrigation systems are and depth to the hardpan. Because of the restricted e`;F suitable. Returning crop residue to the soil or regularly permeability, water applications should be regulated so:t �'k adding other organic material improves fertility, that the water does not stand on the surface and