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S2 Soil Survev Typically, the upper 5 inches of the surface layer is dark brown muck about 17 inches thick. The underlying, brown fine sandy loam. The lower 9 inches is grayish material to a depth of 61 inches is very dark grayish brown and brown fine sandy loam. The upper 14 inches brown and dark gray. mottled silty clay and silty clay of the subsoil is brown and pale brown fine sandy loam. loam. In some areas the surface layer is mucky clay b. The lower 14 inches is pale brown and brown loam and loam or mucky loam. fine sandy loam. The substratum to a depth of 61 Included in this unit are small areas of Ryde and inches is pale brown and light gray fine sandy loam and Valdez soils on the slightly higher parts of the ` sandy loam. In some areas the surface layer is sandy landscape. Also included are small areas of Rindge anc loam or loam. Shinkee soils in landscape positions similar to those of Included in this unit are small areas of Acampo, the Kingile soil. Included areas make up about 15 Devries, and Tujunga soils in the slightly lower percent of the total acreage. landscape positions. Also included, in landscape Permeability is slow in the Kingile soil. Available positions similar to those of the Kingdon soil, are small water capacity is very high. The effective rooting depth areas of Tokay soils and moderately coarse textured of the crops commonly grown in the county is limited b,; 6.. soils that have a moderately fine textured subsoil. an apparent water table that is regulated at a depth of Included areas make up about 15 percent of the total to 4 feet by pumping. This soil is subject to subsidence acreage. Runoff is very slow, and the hazard of water erosion is Permeability is moderate in the Kingdon soil. slight. The rate of water intake in irrigated areas is 4.0 Available water capacity is high. The effective rooting inches per hour. The hazard of soil blowing is severe. depth is 60 inches or more. Runoff is slow, and the The soil is subject to rare flooding, which occurs during hazard of water erosion is slight. The rate of water years of abnormally high precipitation. intake in irrigated areas is 1.5 inches per hour. The Most areas are used for irrigated crops. This unit hazard of soil blowing is moderate. may provide wetland functions and values. These Most areas are used for irrigated crops, orchards, or should be considered in plans for enhancement of vineyards. A few areas are used for homesite wildlife habitat or land use conversion. development. This unit may provide wetland functions This unit is suited to irrigated row and field crops. and values. These should be considered in plans for The main limitations are subsidence, the high water enhancement of wildlife habitat or land use conversion. table, and the slow permeability. General management This unit is well suited to irrigated crops. General considerations include the severe hazard of soil management considerations include the hazard of soil blowing. Because this soil is subject to differential blowing. Furrow, border, and sprinkler irrigation systems subsidence, frequent leveling of the fields is needed to are suitable. A tillage pan forms easily if the soil is tilled improve the efficiency of irrigation. Areas adjacent to when wet. Chiseling or subsoiling breaks up the pan. levees are subject to lateral seepage in wet years when When the wind velocity is high in spring, the hazard of the water level is high. Careful applications of irrigation .. soil blowing can be reduced by properly managing all water are needed to prevent the buildup of a high water crop residue and by minimizing tillage. . table. Large ditches and small spud ditches provide Few limitations affect the use of this nit for homesite subirrigation and improve drainage. Because of the development. restricted permeability,-water applications should be This map unit is in capability class I (MLRA-17), regulated so that the water does not stand on the irrigated, and capability unit IVc-1 (MLRA-17), surface and damage the crops. Subirrigation, furrow, nonirrigated. It is in vegetative soil group A. border, and sprinkler systems are suitable. Where a subirrigation system is used, the water table is raised to 190—Kingile muck, partially drained, 0 to 2 a depth of 1 foot at planting time and then is slowly percent slopes. This very deep, very poorly drained, lowered during the growing season until it is at a depth r nearly level soil is on deltas. It formed in hydrophytic of about 5 feet at harvest time. When the wind velocity plant remains derived from reeds and tules and in the is high in spring, the hazard of soil blowing can be underlying alluvium derived from mixed rock sources. reduced by properly managing all crop residue and by Levees, drainage ditches, and pumping of the water minimizing tillage. Levees should be checked table alter the drainage of this soil. Elevation is 15 feet periodically, and a proper maintenance program should below sea level to 5 feet above. The average annual be developed. precipitation is about 14 inches, the average annual air This map unit is in capability units Illw-10 (MLRA-161.. temperature is about 60 degrees F, and the average irrigated, and IVw-10 (MLRA-16), nonirrigated. It is in frost-free period is about 270 days. vegetative soil group E. Typically, the surface layer is dark gray and very