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<br /> n Joaquin County, California 135
<br /> 25 to 35 feet. The average annual precipitation is average frost-free period is about 270 days.
<br /> gout 11 inches, the average annual air temperature is Typically, the upper part of the surface layer is brown
<br /> ,out 60 degrees F, and the average frost-free period is clay loam about 9 inches thick. The lower part of the
<br /> out 270 days. surface layer and the upper part of the subsoil are
<br /> Typically, the surface layer is grayish brawn silty clay grayish brown and brown clay loam and pale brown
<br /> &.,. m about 19 inches thick. It is underlain by a buried loam about 38 inches thick. The lower part of the
<br /> .rface Eayer and subsoil, which are grayish brown, light subsoil to a depth of 60 inches is pale brown fine sandy
<br /> ownish gray, and pale brown fine sandy loam about loam. The soil is calcareous between depths of 27 and
<br /> ,-,- inches thick. Below this to a depth of 60 inches is a 60 inches. In some areas the surface layer is silty clay
<br /> M brownish gray, strongly cemented hardpan-. In loam.
<br /> ;me areas the surface layer is clay loam. Included in this unit are small areas of Capay,
<br /> included in this unit are small areas of Manteca and Cortina, and El Solyo soils in the slightly lower
<br /> +rerritt soils in landscape positions similar to those of landscape positions. Also included, in landscape
<br /> e Veritas soil and Tinnin soils on the slightly higher positions similar to those of the Vernalis soil, are small
<br /> ;rts of the landscape. Also included, in the slightly areas of Zacharias soils and small areas of soils that
<br /> landscape positions, are small areas of Veritas have a moderately coarse textured or gravelly
<br /> Is that are saline-sodic. Included areas make up substratum below a depth of 40 inches. Included areas
<br /> Dout 15 percent of the total acreage. make up about 15 percent of the total acreage.
<br /> Permeability is moderately rapid in the Veritas soil. Permeability is moderate in the Vernalis soil.
<br /> :ailable water capacity is moderate. The effective Available water capacity is high. The effective rooting
<br /> oting depth is limited by the hardpan at a depth of 40 depth is 60 inches or more. Depth to the water table is
<br /> 60 inches. Depth to the water table is more than 6 more than 6 feet. Runoff is slow, and the hazard of
<br /> wt. but water may be briefly perched above the water erosion is slight. The rate of water intake in
<br /> 3rdpan after periods of heavy rainfall or irrigation. irrigated areas is 0.5 inch per hour.
<br /> .noff is slow, and the hazard of water erosion is Most areas of this unit are used for irrigated crops or
<br /> i,,ght. The rate of water intake in irrigated areas is 0.3 orchards. A few areas are used for dryland grain crops
<br /> :h per hour. The hazard of soil blowing is slight. The or for homesite development.
<br /> I is subject to rare flooding, which occurs during This unit is well suited to irrigated row, field, and
<br /> -ars of abnormally high precipitation. orchard crops. It has few limitations. Furrow, border,
<br /> Vost areas are used for irrigated crops. This unit and sprinkler irrigation systems are suitable. Returning
<br /> ay provide wetland functions and values. These crop residue to the soil or regularly adding other organic
<br /> culd be considered in plans for enhancement of material improves fertility, minimizes crusting, and
<br /> &-;dlife habitat or land use conversion. increases the rate of water intake.
<br /> This unit is suited to irrigated row and field crops. Where this unit is used for dryland grain crops, the
<br /> G main limitation is depth to the hardpan, which limits main limitation is low rainfall during the growing season.
<br /> ..,- suitability for deep-rooted crops. Where feasible, Because the amount of precipitation is not sufficient for
<br /> yep ripping of this restrictive Eayer can help to annual cropping, the best suited cropping system is one
<br /> rcome this limitation. Furrow, border, and sprinkler that includes smafl grain and summer fallow.
<br /> nation systems are suitable. Careful applications of Maintaining crop residue on or near the surface helps to
<br /> cation water are needed to prevent the buildup of a prevent excessive runoff and helps to maintain tilth and
<br /> ,h %slater table. Maintaining crop residue on or near the organic matter content.
<br /> surface helps to prevent excessive runoff and soil If this unit is used for hcmesite development, the
<br /> L�.,Jng and increases the rate of water intake and the main limitation is low strength. Properly designing
<br /> ganic matter content. buildings and roads can offset the limited ability of the
<br /> This map unit is in capability units lls-8 (MLRA-17), soil to support a load.
<br /> "gated, and IVs-8 (MLRA-17), nonirrigated. It is in This map unit is in capability class I (MLRA-17).
<br /> getative soil group A. irrigated, and capability unit 1Vc-1 (MLRA-17),
<br /> nonirrigated. It is in vegetative soil group A.
<br /> 268—Vernalis clay loam, 0 to 2 percent slopes.
<br /> is very deep, well drained. nearly level soil is on 269—Vernalis clay loam, wet, 0 to 2 percent
<br /> uvial fans, ft formed in alluvium derived from mixed slopes. This very deep, well drained. nearly level soil is
<br /> =k sources. Elevation is 25 to 300 feet. The average on alluvial fans. It formed in alluvium derived from
<br /> 4+cual precipitation is about 10 inches, the average mixed rock sources. It has a high water table as a result
<br /> -ual air temperature is about 60 degrees F, and the of the application of irrigation water. Drainage systems
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