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Soil Survey 68 .. throughout and is weakly cemented with lime below a Is 105 to 140 feet. The average annual precipitation is depth of 15 inches. In some areas the surface layer is about 17 inches, the average annual air temperature is .. loam or sandy clay loam. about 60 degrees F, and the average frost-free period is Included in this unit are small areas of Guard soils about 270 days. that have a perched water table at a depth of 3 to 5 Typically, the surface layer is brown loam about 15 r feet. These soils are in the slightly lower landscape inches thick. The upper 21 inches of the subsoil is positions. Also included are small areas of Hollenbeck, brown sandy clay loam. The lower part to a depth of 60 Stockton, Devries, and Rioblancho soils on the slightly inches is brown sandy loam. In some areas the surface higher parts of the landscape and Columbia, layer is gravelly loam. r Grangeville, Ryde, and Scribner soils in landscape Included in this unit are small areas of Yellowlark positions similar to those of the Guard soil. Included soils on the slightly higher parts of the landscape and areas make up about 15 percent of the total acreage_ soils that are similar to the Hicksville soil but have a Permeability is slow in the Guard soil. Available subsoil that is gravelly and moderately fine textured or ` water capacity is high. The effective rooting depth is 60 fine textured. Also included are areas of Pentz, inches or more. Depth to the apparent water table has Redding, and Rocklin soils on the higher terraces. been lowered to a depth of more than 5 feet through Included areas make up about 15 percent of the total drainage systems that require continual maintenance, acreage. but water may be perched above the weakly cemented Permeability is moderately slow in the Hicksville soil. substratum after periods of heavy rainfall or irrigation. Available water capacity is high. The effective rooting Runoff is slow, and the hazard of water erosion is depth is 60 inches or more. Depth to an apparent water ` slight. The rate of water intake in irrigated areas is 0.5 table is 5 to 6 feet. Runoff is very slow or slow, and the inch per hour. The soil is subject to rare flooding, which hazard of water erosion is slight. The rate of water occurs during years of abnormally high precipitation. intake in irrigated areas is 1.0 inch per hour. The soil is Most areas are used for irrigated crops. This unit subject to occasional, very brief periods of flooding from may provide wetland functions and values. These December through April. Streambank erosion occurs should be considered in plans for enhancement of along many of the meandering drainageways. wildlife habitat or land use conversion. Most areas are used for livestock grazing. A few ` This unit is suited to irrigated row and field crops. areas are used for irrigated crops. This unit may The main limitations are depth to the weakly cemented provide wetland functions and values. These should be substratum and the slow permeability. The weakly considered in plans for enhancement of wildlife habitat cemented substratum limits the suitability for deep- or land use conversion. rooted crops. Where feasible, deep ripping of this Where this unit is used for livestock grazing, general restrictive layer can help to overcome this limitation. management considerations include the hazard of Because of the restricted permeability, water occasional flooding and saturated soil conditions in applications should be regulated so that the water does concave areas following rainy periods. The not stand on the surface and damage the crops. Careful characteristic plant community is mainly soft chess, wild applications of irrigation water are needed to prevent oat, dpgut brume, and filaree. The grazing system may the buildup of a high water table. A drainage system be impaired by the occasional flooding. Grazing should may be needed. Furrow, border, and sprinkler irrigation be delayed until the soil is firm enough to withstand systems are suitable. Returning crop residue to the soil trampling by livestock and the more desirable forage ` or regularly adding other organic material improves plants have had an opportunity to set seed. The unit fertility, minimizes crusting, and increases the rate of responds well to range improvement practices, such as water intake. seeding and applying fertilizer. The plants selected for This map unit is in capability units Ilw-2 (MLRA-17), seeding should be those that meet the seasonal ko irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in requirements of livestock, wildlife, or both. After seeding vegetative soil group A. is complete, grazing should be deferred until the plants have set seed. 170—Hicksville loam, 0 to 2 percent slopes, This unit is suited to irrigated row, field, vineyard, and ` occasionally flooded. This very deep, moderately well orchard crops. The occasional flooding is a hazard. drained, nearly level soil is on low stream terraces. It Most climatically adapted crops can be grown if the soil formed in alluvium derived from mixed rock sources. is protected from flooding late in spring and early in Slopes are plane and are incised by many shallow summer and if a drainage system is installed. The risk meandering drainageways. The native vegetation of flooding can be reduced by levees and diversions. consists mainly of annual grasses and (orbs. Elevation Careful applications of irrigation water are needed to