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San Joaquin County, California 109
<br /> This unit is suited to irrigated pasture. The main should be considered in plans for enhancement of
<br /> limitation is the low available water capacity. Because wildlife habitat or land use conversion.
<br /> the soil is droughty, applications of irrigation water This unit is suited to irrigated row and field crops.
<br /> should be light and frequent. The water can be applied The main limitations are subsidence and the high water
<br /> by sprinkler and border methods. Leveling helps to table. General management considerations include the
<br /> ensure a uniform application of water. Proper stocking hazard of soil blowing. Because this soil is subject to
<br /> rates, pasture rotation, and restricted grazing during wet differential subsidence, frequent leveling of the fields is
<br /> periods help to keep the pasture in good condition and needed to improve the efficiency of irrigation. Areas
<br /> protect the soil from compaction. adjacent to levees are subject to lateral seepage in wet
<br /> If this unit is used for homesite development, the years when the water level is high. Careful applications
<br /> main limitation is depth to the hardpan. Ripping the of irrigation water are needed to prevent the buildup of
<br /> hardpan improves permeability and thus also improves a high water table. Large ditches and small spud
<br /> the suitability of the soil for septic tank absorption fields. ditches provide subirrigation and improve drainage.
<br /> This map unit is in capability units Ills-8 (MLRA-17), Subirrigation, furrow, border, and sprinkler systems are
<br /> irrigated, and IVs-8 (MLRA-17), nonirrigated. It is in suitable. Where a subirrigation system is used, the
<br /> r vegetative soil group G. water table is raised to a depth of 1 foot at planting time
<br /> and then is slowly lowered during the growing season
<br /> 230—Ryde clay loam, partially drained, 0 to 2 until it is at a depth of about 5 feet at harvest time.
<br /> percent slopes. This very deep, very poorly drained, When the wind velocity is high in
<br /> nrsper9 managing hazard
<br /> all f
<br /> �- nearly level soil is on flood plains and deltas. It formed soil blowing can be reduced by p p Y 9 9
<br /> in hydrophytic plant remains and in alluvium derived crop residue and by minimizing tillage. Levees should
<br /> from mixed rock sources. Mottles in the profile indicate be checked periodically, and a proper maintenance
<br /> a very poorly drained soil; however, drainage has been program should be developed.
<br /> improved by levees and reclamation projects. Elevation This map unit is in capability units Illw-2 (MLRA-16),
<br /> is 15 feet below sea level to 5 feet above. The average irrigated, and IVw-2 (MLRA-16), nonirrigated. It is in
<br /> annual precipitation is about 14 inches, the average vegetative soil group E.
<br /> annual air temperature is about 60 degrees F, and the
<br /> average frost-free period is about 270 days. 231—Ryde silty clay loam, organic substratum,
<br /> Typically, the surface layer is grayish brown and dark partially drained, 0 to 2 percent slopes. This very
<br /> r, gray, mottled clay loam about 24 inches thick. The deep, very poorly drained, nearly level soil is on flood
<br /> underlying material to a depth of 63 inches is very dark plains and deltas. It formed in hydrophytic plant remains
<br /> gray and dark grayish brown, stratified mucky clay and in alluvium derived from mixed rock sources.
<br /> loam, silty clay loam, and muck. In some areas the Mottles in the profile indicate a very poorly drained soil;
<br /> surface layer is mucky clay loam or silty clay loam. however, drainage has been improved by levees and
<br /> Included in this unit are small areas of Egbert, reclamation projects. Elevation is 15 feet below sea
<br /> Guard, and Peltier soils in landscape positions similar to level to 5 feet above. The average annual precipitation
<br /> those of the Ryde soil and Scribner soils on the slightly is about 14 inches, the average annual air temperature
<br /> higher parts of the landscape. Also included are small is about 60 degrees F, and the average frost-free period
<br /> areas of Itano, Kingile, and Rindge soils in the slightly is about 270 days.
<br /> lower landscape positions. Included areas make up Typically, the surface layer is grayish brown and dark
<br /> about 15 percent of the total acreage. gray, mottled silty clay loam about 24 inches thick. The
<br /> Permeability is moderately slow in the Ryde soil. upper 16 inches of the underlying material is very dark
<br /> Available water capacity is very high. The effective gray and dark grayish brown, mottled silty clay loam.
<br /> rooting depth of the crops commonly grown in the The lower part to a depth of 60 inches is black mucky
<br /> county is limited by an apparent water table that is peat. In some areas the surface layer is mucky clay
<br /> regulated at a depth of 3 to 4 feet by pumping. This soil loam or mucky silty clay loam.
<br /> is subject to subsidence. Runoff is very slow, and the Included in this unit are small areas of Kingile,
<br /> hazard of water erosion is slight. The rate of water Rindge, Venice, and Webile soils in the slightly lower
<br /> intake in irrigated areas is 0.5 inch per hour. The landscape positions. Also included are small areas of
<br /> hazard of soil blowing is moderate. The soil is subject moderately fine textured soils that have an organic
<br /> to rare flooding, which occurs during years of substratum at a depth of 30 to 40 inches. Included
<br /> abnormally high precipitation. areas make up about 15 percent of the total acreage.
<br /> Most areas are used for irrigated crops. This unit Permeability is moderately slow in the upper part of
<br /> may provide wetland functions and values. These the Ryde soil and rapid in the organic substratum.
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