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<br />Typically, the surface layer is dark brown clay loam
<br />about 23 inches thick. The upper 25 inches of the
<br />subsoil is brown and light yellowish brown clay loam.
<br />The lower part to a depth of 60 inches is a light
<br />yellowish brown, strongly cemented or indurated
<br />hardpan. In some areas the surface layer is loam.
<br />Included in this unit are small areas of Archerdale,
<br />Cogna, and Vignolo soils in landscape positions similar
<br />to those of the Boggiano soil. Also included are small
<br />areas of Columbia, Hollenbeck, and Stockton soils in
<br />the slightly lower positions. Included areas make up
<br />about 15 percent of the total acreage.
<br />Permeability is moderately slow in the Boggiano soil.
<br />Available water capacity is high. The effective rooting
<br />depth is limited by the hardpan at a depth of 40 to 60
<br />inches. Depth to the water table is more than 6 feet, but
<br />water may be briefly perched above the hardpan after
<br />periods of heavy rainfall or irrigation. Runoff is slow,
<br />and the hazard of water erosion is slight. The rate of
<br />water intake in irrigated areas is 0.5 inch per hour. The
<br />soil is subject to rare flooding, which occurs during
<br />years of abnormally high precipitation.
<br />Most areas are used for irrigated crops or orchards.
<br />A few areas are used for homesite development. This
<br />unit may provide wetland functions and values. These
<br />should be considered in plans for enhancement of
<br />wildlife habitat or land use conversion.
<br />This unit is suited to irrigated row, field, and orchard
<br />crops. The main limitation is depth to the hardpan,
<br />which limits the suitability for deep-rooted crops. Where
<br />feasible, deep ripping of this restrictive layer can help to
<br />overcome this limitation. Furrow, border, and sprinkler
<br />irrigation systems are suitable. Careful applications of
<br />irrigation water are needed to prevent the buildup of a
<br />high water table. Returning crop residue to the soil or
<br />regularly adding other organic material improves fertility,
<br />minimizes crusting, and increases the rate of water
<br />intake.
<br />If this unit is used for homesite development, the
<br />main limitation is depth to the hardpan. The rare
<br />flooding is a hazard. Ripping the hardpan improves
<br />permeability and thus also improves the suitability of the
<br />soil for septic tank absorption fields. Houses, roads, and
<br />streets should be constructed above expected flood
<br />levels.
<br />This map unit is in capability units IIs -8 (MLRA-17),
<br />irrigated, and IVs -8 (MLRA-17), nonirrigated. It is in
<br />vegetative soil group A.
<br />111—Bruella sandy loam, 0 to 2 percent slopes.
<br />This very deep, well drained, nearly level soil is on low
<br />terraces. It formed in alluvium derived from granitic rock
<br />sources. A few areas are dissected by intermittent
<br />sloughs that have been filled as a result of land
<br />Soil Survey
<br />leveling. Elevation is 70 to 120 feet. The average
<br />annual precipitation is about 15 inches, the average
<br />annual air temperature is about 60 degrees F, and the
<br />average frost -free period is about 270 days.
<br />Typically, the surface layer is brown sandy loam
<br />about 18 inches thick. The upper 13 inches of the
<br />subsoil is brown sandy clay loam. The lower 36 inches
<br />is brown, strong brown, and light brown sandy clay
<br />loam. In some areas the surface layer is loam.
<br />Included in this unit are small areas of San Joaquin,
<br />Tokay, Kingdon, Jahant, and Devries soils in the slightly
<br />lower landscape positions. Included areas make up
<br />about 15 percent of the total acreage.
<br />Permeability is moderately slow in the Bruella soil.
<br />Available water capacity is high. The effective rooting
<br />depth is 60 inches or more. Depth to the water table is
<br />more than 6 feet. Runoff is slow, and the hazard of
<br />water erosion is slight. The rate of water intake in
<br />irrigated areas is 1.5 inches per hour.
<br />Most areas are used for irrigated crops, orchards, or
<br />vineyards. A few areas are used for homesite
<br />development. This unit may provide wetland functions
<br />and values. These should be considered in plans for
<br />enhancement of wildlife habitat or land use conversion.
<br />This unit is well suited to irrigated row, field, orchard,
<br />and vineyard crops. It has few limitations. Furrow,
<br />border, and sprinkler irrigation systems are suitable.
<br />Returning crop residue to the soil or regularly adding
<br />other organic material improves fertility, minimizes
<br />crusting, and maintains the rate of water intake.
<br />If this unit is used for homesite development, the
<br />main limitation is the moderately slow permeability. On
<br />sites for septic tank absorption fields, this limitation can
<br />be overcome by increasing the size of the absorption
<br />field.
<br />This map unit is in capability class I (MLRA-17),
<br />irrigated, and capability unit IVc-1 (MLRA-17),
<br />nonirrigated. It is in vegetative soil group A.
<br />112—Bruella sandy loam, hard substratum, 0 to 2
<br />percent slopes. This very deep, moderately well
<br />drained, nearly level soil is on low terraces. It formed in
<br />alluvium derived from granitic rock sources. A few areas
<br />are dissected by intermittent sloughs that have been
<br />filled as a result of land leveling. Elevation is 70 to 120
<br />feet. The average annual precipitation is about 15
<br />inches, the average annual air temperature is about 60
<br />degrees F, and the average frost -free period is about
<br />270 days.
<br />Typically, the surface layer is brown sandy loam
<br />about 8 inches thick. The upper part of the subsoil is
<br />dark brown and strong brown sandy clay loam about 34
<br />inches thick. The lower part to a depth of 60 inches is
<br />strong brown, weakly cemented sandy clay loam. In
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