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1 1 110 Soil Survey Available water capacity is very high. The effective and grayish brown, mottled silty clay loam. The lower ' rooting depth of the crops commonly grown in the part to a depth of 60 inches is light gray, stratified county is limited by an apparent water table that is loamy fine sand and loamy sand. In some areas the regulated at a depth of 3 to 4 feet by pumping. Depth to surface layer is mucky clay loam or silty clay loam. ' the organic substratum ranges from 40 to 60 inches. Included In this unit are small areas of Egbert, Runoff is very slow, and the hazard of water erosion is Merritt, Piper, and Valdez soils; Ryde soils that have slight. The rate of water intake in irrigated areas is 0.3 stratified medium textured or moderately fine textured inch per hour. The hazard of soil blowing is moderate. material below a depth of 40 inches; and moderately The soil is subject to rare flooding, which occurs during fine textured soils that have a coarse textured years of abnormally high precipitation. substratum at a depth of 30 to 40 inches. All of these Most areas are used for irrigated crops. This unit included soils are in landscape positions similar to may provide wetland functions and values. These those of the dominant Ryde soil. Also included are Dello should be considered in plans for enhancement of and Kingile soils in the slightly lower landscape wildlife habitat or land use conversion. positions. Included areas make up about 15 percent of This unit Is suited to irrigated row and field crops. the total acreage. ' The main limitations are subsidence and the high water Permeability is moderately slow in the upper part of table. General management considerations include the the Ryde soil and rapid in the sandy substratum. hazard of soil blowing. Because this soil is subject to Available water capacity is high, The effective rooting differential subsidence, frequent leveling of the fields is depth of the crops commonly grown in the county is needed to improve the efficiency of irrigation. Areas limited by an apparent water table that is regulated at a adjacent to levees are subject to lateral seepage in wet depth of 3 to 4 feet by pumping. Depth to the sandy ' years when the water level is high. Careful applications substratum ranges from 40 to 60 inches. The soil is of irrigation water are needed to prevent the buildup of subject to subsidence. Runoff is very slow, and the a high water table. Large ditches and small spud hazard of water erosion is slight. The rate of water ditches provide subirrigation and improve drainage. intake in irrigated areas is 0.5 inch per hour. The t Subirrigation, furrow, border, and sprinkler systems are hazard of soil blowing is moderate. The soil is subject suitable. Where a subirrigation system is used, the to rare flooding, which occurs during years of water table is raised to a depth of 1 foot at planting time abnormally high precipitation. and then is slowly lowered during the growing season Most areas are used for irrigated crops. This unit ' until it is at a depth of about 5 feet at harvest time. may provide wetland functions and values. These When the wind velocity is high in spring, the hazard of should be considered in plans for enhancement of soil blowing can be reduced by properly managing all wildlife habitat or land use conversion. ' crop residue and by minimizing tillage, Levees should This unit is suited to irrigated row and field crops. be checked periodically, and a proper maintenance The main limitations are subsidence and the high water program should be developed. table. General management considerations include the This map unit is in capability units Illw-2 (MLRA-16), hazard of soil blowing. Because this soil is subject to irrigated, and IVw-2 (MLRA-16), nonirrigated. It is in differential subsidence, frequent leveling of the fields is vegetative soil group E. needed to improve the efficiency of irrigation. Areas adjacent to levees are subject to lateral seepage in wet ' 232—Ryde clay loam, sandy substratum, partially years when the water level is high. Careful applications drained, 0 to 2 percent slopes. This very deep, very of irrigation water are needed to prevent the buildup of poorly drained, nearly level soil is on flood plains and a high water table. Large ditches and small spud deltas. It formed in alluvium derived from mixed rock ditches provide subirrigation and improve drainage. ' sources and in hydrophytic plant remains. Mottles in the Subirrigation, furrow, border, and sprinkler systems are profile indicate a very poorly drained soil; however, suitable. Where a subirrigation system is used, the drainage has been improved by levees and reclamation water table is raised to a depth of 1 foot at planting time projects. Elevation is 15 feet below sea level to 5 feet and then is slowly lowered during the growing season above. The average annual precipitation is about 14 until it is at a depth of about 5 feet at harvest time. inches, the average annual air temperature is about 60 When the wind velocity is high in spring, the hazard of degrees F, and the average frost-free period is about soil blowing can be reduced by properly managing all ' 270 days. crop residue and by minimizing tillage. Levees should Typically, the surface layer is grayish brown and dark be checked periodically, and a proper maintenance gray, mottled clay loam about 24 inches thick. The program should be developed. ' upper 16 inches of the underlying material is dark gray This map unit is in capability units Illw-2 (MLRA-16),