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San Joaquin County, California 103
<br /> hazard of erosion, and the very low available water to a depth of 60 inches is a reddish yellow and
<br /> capacity. The characteristic plant community is mainly yellowish red, indurated hardpan. In some areas the
<br /> ` soft chess, ripgut brome, foxtall fescue, and filaree. surface layer is gravelly sandy loam, cobbly loam, or
<br /> Grazing should be delayed until the soil is firm enough loam.
<br /> to withstand trampling by livestock and the more Included in this unit are small areas of Bellota and
<br /> `. desirable forage plants have had an opportunity to set Pardee soils on terraces and shallow, medium textured
<br /> seed. Grazing should be controlled so that desirable soils that have a claypan at a depth of 10 to 15 inches
<br /> vegetation, such as soft chess, is maintained and and are in landscape positions similar to those of the
<br /> enough vegetation is left standing to protect the soil Redding soil.Also included are small areas of Alamo
<br /> from erosion. The very low available water capacity and Yellowlark soils in drainageways, Pentz soils on the
<br /> limits the production of desirable forage plants, slightly higher terraces, Peters soils in the slightly lower
<br /> This unit is suited to irrigated pasture. The main landscape positions, and Redding soils that have slopes
<br /> limitation is the very low available water capacity. of 2 to 8 percent and are on toe slopes. Included areas
<br /> General management considerations include the hazard make up about 15 percent of the total acreage.
<br /> of erosion. Because the soil is droughty, applications of Permeability is very slow in the Redding soil.
<br /> irrigation water should be light and frequent. The water Available water capacity is very low. The shrink-swell
<br /> can be applied by sprinkler and border methods. potential is high. The effective rooting depth is limited
<br /> Seedbed preparation should be on the contour or by the hardpan at a depth of 20 to 40 inches. Roots are
<br /> across the slope where practical. Proper stocking rates, restricted to cracks and the faces of peds in the
<br /> pasture rotation, and restricted grazing during wet claypan, which Is at a depth of 16 to 22 inches. Water
<br /> periods help to keep the pasture in good condition and is briefly perched above the claypan after periods of
<br /> protect the soil from erosion. heavy rainfall. Runoff is medium or rapid, and the
<br /> Where this unit is used for dryland grain crops, the hazard of water erosion is moderate or severe.
<br /> ` main limitation is low rainfall during the growing season. Most areas are used for livestock grazing. This unit
<br /> General management considerations include the hazard may provide wetland functions and values. These
<br /> of erosion. Because the amount of precipitation is not should be considered in plans for enhancement of
<br /> sufficient for annual cropping, the best suited cropping wildlife habitat or land use conversion.
<br /> system is one that includes small grain and summer Where this unit is used for livestock grazing, general
<br /> fallow. All tillage should be on the contour or across the management considerations include the hazard of
<br /> slope. Limiting tillage during seedbed preparation and erosion and the very low available water capacity. The
<br /> during the application of weed-control measures helps characteristic plant community is mainly soft chess,
<br /> to control runoff and erosion. Leaving crop residue on ripgut brome, foxtail fescue, and filaree. Grazing should
<br /> or near the surface helps to conserve moisture, be controlled so that desirable vegetation, such as soft
<br /> maintain tilth, and control erosion. chess, is maintained and enough vegetation is left
<br /> This map unit is in capability unit IVe-3 (MLRA-17), standing to protect the soil from erosion. Loss of the
<br /> irrigated and nonirrigated. It is in vegetative soil group surface layer results in a severe decrease in
<br /> D, productivity and in the potential of the unit to produce
<br /> plants suitable for grazing. The very low available water
<br /> 221—Redding gravelly loam, 8 to 30 percent capacity limits the production of desirable forage plants.
<br /> slopes. This moderately well drained, rolling to This map unit is in capability unit IVe-3 (MLRA-17),
<br /> moderately steep soil is on dissected high terraces. It is nonirrigated. It Is In vegetative soil group D.
<br /> moderately deep to a hardpan. It formed in alluvium
<br /> derived from mixed rock sources. The native vegetation 222—Reiff fine sandy loam, 0 to 2 percent slopes,
<br /> is mainly annual grasses and forbs. Slopes are occasionally flooded. This very deep, well drained,
<br /> complex, and the landscape is characterized by nearly level soil is on flood plains. It formed in alluvium
<br /> hummocky microrelief. Elevation is 130 to 350 feet. The derived from mixed rock sources. Elevation is 80 to 165
<br /> average annual precipitation is about 17 inches, the feet. The average annual precipitation is about 16
<br /> average annual air temperature is about 60 degrees F, inches, the average annual air temperature is about 60
<br /> and the average frost-free period is about 260 days. degrees F, and the average frost-free period is about
<br /> Typically, the upper part of the surface layer is strong 270 days.
<br /> ` brown gravelly loam about 7 inches thick. The lower Typically, the surface layer is brown fine sandy loam
<br /> part is reddish yellow gravelly loam about 9 inches about 9 inches thick. The upper 47 inches of the
<br /> thick. The upper part of the subsoil is a claypan of underlying material is brown and pale brown, stratified
<br /> reddish brown clay about 6 inches thick. The lower part loamy sand and sandy loam. The lower part to a depth
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