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i Soil Survey him 70 clay loam and brown very gravelly raven sandy loam. In some minimizes crusting, and increases the rate of water intake. areas the surface layer is loam. This map unit is in c Included in this unit are small areas of Yellowlaapability units IIw-2 (MCRA-17). rk irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in ` soils on the slightly higher parts of the landscape and vegetative soil group A. soils that are similar to the Hicksville soil but have a 173—Hollenbeck silty clay, 0 to 2 percent slopes. subsoil that is very gravelly and moderately fine L textured or gravelly and fine textured or moderately This moderately well drained, nearly level soil is in interfan basins. it is deep to a hardpan. It formed in coarse textured. Also included are Redding and Rocklin alluvium derived from mixed rock sources. A few areas soils on the higher terraces. Included areas make up about 15 percent of the total acreage. sloughs that have filled as a result of land leveling. Elevation is 20 to 100 Permeability is moderately slow in the Hicksville soil. are dissected by intermittent sloue Available water capacity is moderate. The effective feet. The average annual precipitation is about 14 rooting depth is 60 inches or more. Depth to an slow inches, the average annual air temperature is about 60 apparent water table is 5 to 6 feet. Runoff is very degrees F, and the average frost-free period is about or slow, and the hazard of water erosion is slight. The 270 days. rate of water intake in irrigated areas is 1.0 inch per Typically, the surface layer is grayish brown silty clay about 10 inches thick. The upper 27 inches of the hour. The soil is subject to occasional, very brief The next 5 periods of flooding from December through the subsoil is brown and yellowish brown clay. Streambank erosion occurs along many inches is grayish brown silty clay loam. The lower part meandering drainageways. grazing A few to a depth of 60 inches is a variegated light yellowish Most areas are used for livestock g 9 brown, weakly cemented to strongly cemented hardpan. areas are used for irrigated crops. This unit may In some areas the surface layer is clay or clay loam. provide wetland functions and values. These should be Included in this unit are small areas of Archerdale, ~ considered in plans for enhancement of wildlife habitat Cogna, and Vignolo soils on the slightly higher parts of or land use conversion. general the landscape, Stockton and Galt soils in landscape oil, and Where this unit is used for livestock grazing, 9 positions similar to those of the Hollenbeck positions. Guard soils in the slightly lower landscape p management considerations include the hazard of p _ occasional flooding and saturated soil conditions in Also included are small areas of Hollenbeck soils that`, concave areas following rainy periods. The are highly calcareous or saline-sodic throughout. Included areas make up about 15 percent of the total characteristic plant community is mainly rsofs stem may g Y oat, ripgut brome, and filaree. The grazing Y acreage. be impaired by g' g Permeability is slow in the Hollenbeck soil. Available the occasional flooding. Grazing shouldcapacity is moderate. The shrink-swell potential I be delayed until the soil is firm enough to withstand water cap Y trampling by livestock and the more desirable forage high. The effective rooting depth is limited by the plants have had an opportunity to set seed. The unit hardpan at a depth of 40 to 6o inches. Depth to the water table is more than 6 feet, but water may be brief responds well to range improvement practices, such as perched above the hardpan after periods of heavy ►- seeding and applying fertilizer. The plants selected for rainfall or irrigation. Runoff is slow, and the hazard cf seeding should be those that meet the seasonal p requirements of livestock, wildlife, or both. After seeding water erosion is slight. The rate of water intake in is complete, grazing should be deferred until the plants irrigated areas is 0.1 inch per hour. Thsoil is subjed have set seed. vine ard, and to rare flooding, which occurs during years This unit is suited to irrigated row, field, Y abnormally high precipitation. Most areas are used for irrigated crops or orchard L orchard crops. General management considerations A few areas are used as irrigated pasture or for include the hazard of occasional flooding and the provide wet gravelly subsoil. Most climatically adapted crops can be homesite development. This unit may p grown if the soil is protected from flooding late in spring functions and values. These should be considered in L and early in summer and if a drainage system is tans for enhancement of wildlife habitat or land use installed. The risk of flooding can be reduced exposeby the levees conversion. orch and diversions. Leveling for irrigation ons may expos water This unit is suited to irrigated row, field, and ` gravelly subsoil. Careful app' penrie he slow s are and depth to the hardpan. Because of the restricted are needed to prevent the buildup of a high water table. crops. The main limitatiircat onsns are ishould be reivaatler Furrow, border, and spri cels dueer 9otthe soion stor�egularly permeability, water app suitable. Returning crop that the water does not stand on the surface and j adding other organic material improves fertility, � j