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rSan Joaquin County, California 33
<br /> some areas the surface layer is loam. 500 feet. The average annual precipitation is 9 to 13
<br /> ' Included in this unit are small areas of Rocklin, San inches, the average annual air temperature is about 61
<br /> Joaquin, Jahant, and Tokay soils in the slightly lower degrees F, and the average frost-free period is about
<br /> landscape positions. Also included are small areas of 270 days.
<br /> Bruella soils that do not have a hard substratum. Typically, the surface layer and the upper part of the
<br /> Included areas make up about 15 percent of the total subsoil are light brownish gray clay loam about 11
<br /> acreage. inches thick. The next part of the subsoil is light gray,
<br /> Permeability is moderately slow in the upper part of grayish brown, and light brownish gray clay loam about
<br /> the Bruella soil and slow in the hard substratum. 18 inches thick. The lower part to a depth of 60 inches
<br /> Available water capacity is moderate. The effective is wh '.e and light gray clay loam. The soil is calcareous
<br /> F. rooting depth is 60 inches, but roots are restricted by throughout. In some areas the surface layer is loam,
<br /> the hard substratum at a depth of 40 to 60 inches. Included in this unit are small areas of Carbona and
<br /> Dopth to the water table is more than 6 feet, but water Pleito soils in the slightly lower landscape positions.
<br /> ' may be very briefly percher above the hard substratum Also included, on the slightly higher parts of the
<br />{ .after periods of heavy rainfall or irrigation. Runoff is landscape, are small areas of Calla soils that have
<br /> slow, and the hazard of water erosion is slight. The rate slopes of 8 to 15 percent. Included areas make up
<br /> Fofwater intake in irrigated areas is 1.5 inches per hour. about 15 percent of the total acreage.
<br /> Most areas are used for irrigated crops, orchards, or Permeability is moderately slow in the Calla soil.
<br /> vineyards. A few areas are used for homesite Available water capacity is very high. The effective
<br /> F.development. This unit may provide wetland functions rooting depth is 60 inches or more. Runoff is medium,
<br />' and values. These should be considered in plans for and the hazard of water erosion is moderate. The rate
<br /> I `enhancement of wildlife habitat or land use conversion. of water intake in irrigated areas is 0.5 inch per hour.
<br /> M This unit is suited to irrigated row, field, orchard, and This unit is used for livestock grazing or dryland grain
<br /> F—vineyardcrops. The main limitations are the slow crops. It can be used for irrigated crops if irrigation
<br /> permeability and depth to the hard substratum. Because water is available.
<br /> of the restricted permeability, water applications should Where this unit is used for livestock grazing, general
<br /> +-be regulated so that the water does not stand on the management considerations include the clay loam
<br /> surface and damage the crops. The hard substratum surface layer. The characteristic plant community is
<br /> limits the suitability for deep-rooted crops. Where mainly soft chess, red brome, wild oat, and filaree.
<br /> feasible, deep ripping of this restrictive layer can help to Trampling of the clay loam surface layer by livestock
<br /> overcome this limitation. Furrow, border, and sprinkler when the soil is too wet reduces productivity and
<br /> irrigation systems are suitable. Returning crop residue increases the runoff rate.
<br /> to the soil or regularly adding other organic material Where this unit is used for dryland grain crops, the
<br /> improves fertility, minimizes crusting, and maintains the main limitation is low rainfall during the growing season.
<br /> .rate of water intake. General management considerations include the hazard
<br /> I€ this unit is used for homesite development, the of erosion. Because the amount of precipitation is not
<br /> hain limitations are the slow permeability and depth to sufficient for annual cropping, the best suited cropping
<br /> e hard substratum. On sites for septic tank absorption system is one that includes small grain and summer
<br /> fields, the slow permeability can be overcome by fallow. All tillage should be on the contour or across the
<br /> rn creasing the size of the absorption field, backfilling the slope. Leaving crop residue on or near the surface
<br /> rench with sandy material, and installing long helps to conserve moisture, maintain tilth, and control
<br /> absorption lines. Ripping the hard substratum improves erosion.
<br /> Permeability and thus also improves the suitability of the Few limitations affect the use of this unit for irrigated
<br /> soil for septic tank absorption fields. row, field, and orchard crops. General management
<br /> J This map unit is in capability units Its-3 (MLRA-17), considerations include the hazard of erosion. Sprinkler
<br /> y irrigated, and IVs-3 (MLRA-17), nonirrigated. It is in and drip irrigation systems are suitable. They permit an
<br /> tl Fegetative sail group A. even, controlled application of water, help to prevent
<br /> excessive runoff, and minimize the risk of erosion. All
<br /> 113—Calla clay loam, 2 to 8 percent slopes. This tillage should be on the contour or across the slope.
<br /> very deep, well drained, gently sloping and moderately Returning crop residue to the soil or regularly adding
<br /> loping soil is on uplifted, dissected terraces. It formed other organic material improves fertility, minimizes
<br /> n alluvium derived from mixed rock sources. The crusting, and increases the rate of water intake.
<br /> vegetation in areas that have not been cultivated is This map unit is in capability unit iVe-1 (MLRA-17),
<br /> mainly annual grasses and forbs. Elevation is 300 to nonirrigated. It is in vegetative soil group A.
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