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' 128 Soil Survey
<br /> development. This unit may provide wetland functions Typically, the surface layer is grayish brown loamy
<br /> and values. These should be considered in plans for coarse sand about 28 inches thick. The upper 25 inches
<br /> enhancement of wildlife habitat or land use conversion, of the underlying material is brown, mottled loamy
<br /> This unit is suited to irrigated row and field crops. coarse sand. The lower part to a depth of 75 inches is
<br /> The main limitations are the low available water pale brown, mottled loamy coarse sand. In some areas
<br /> capacity and depth to the hardpan. General the surface layer is loamy fine sand or sandy loam.
<br /> management considerations include the severe hazard Included in this unit are small areas of Delhi and
<br /> of soil blowing. Because the soil is droughty, Honcut soils on the slightly higher parts of the
<br /> applications of irrigation water should be light and landscape and Manteca and Veritas soils on the slightly
<br /> frequent. I-he high percentage of sand in the soil lower parts_ Also included, in landscape positions
<br /> reduces the amount of moisture available for plant similar to those of the Tinnin soil, are small areas of
<br /> growth. The hardpan limits the suitability for deep- Timor soils and coarse textured soils that have a
<br /> rooted crops. Where feasible, deep ripping of this medium textured substratum below a depth of 40
<br /> ' restrictive layer can help to overcome this limitation. inches. Included areas make up about 15 percent of the
<br /> Sprinkler and drip irrigation systems are suitable. They total acreage.
<br /> permit an even, controlled application of water, help to Permeability is rapid in the Tinnin soil. Available
<br /> prevent excessive runoff, and minimize the risk of water capacity is low. The effective rooting depth is 60
<br /> erosion. Careful applications of Irrlgation water are inches or more. Runoff is slow, and the hazard of water
<br /> needed to prevent the buildup of a high water table. A erosion is slight. The rate of water intake in irrigated
<br /> tillage pan forms easily if the soil is tilled when wet. areas is 3.0 inches per hour. The hazard of soil blowing
<br /> ' Chiseling or subsoiling breaks up the pan. When the is severe.
<br /> wind velocity is high in spring, the hazard of soil Most areas of this unit are used for irrigated crops,
<br /> blowing can be reduced by properly managing all crop orchards, or vineyards. A few areas are used for
<br /> residue and by minimizing tillage. homesite development.
<br /> ' This unit is suited to irrigated pasture. The main This unit is suited to irrigated row, field, orchard, and
<br /> limitation is the low available water capacity. Because vineyard crops The main limitation is the low available
<br /> the soil is droughty, applications of irrigation water water capacity. General management considerations
<br /> ' should be light and frequent. The water can o a llcu itc!u o t"c o,vcr2 hazar o 3 it blowing. Because the
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<br /> by sprinkler and border methods. Leveling helps to soil is droughty, applications of irrigation water should
<br /> ensure a uniform application of water. Proper stocking be light and frequent. The high percentage of sand in
<br /> rates, pasture rotation, and restricted grazing during wet the soil reduces the amount of moisture available for
<br /> ' periods help to keep the pasture in good condition and plant growth. Sprinkler and drip irrigation systems are
<br /> protect the soil from compaction. suitable. They permit an even, controlled application of
<br /> If this unit is used for homesite development, the water, help to prevent excessive runoff, and minimize
<br /> ' main limitations are depth to the hardpan and the rapid the risk of erosion. A tillage pan forms easily if the soil
<br /> permeability. The rare flooding is a hazard. Ripping the is tilled when wet. Chiseling or subsoiling breaks up the
<br /> hardpan improves permeability and thus also improves pan. When the wind velocity is high in spring, the
<br /> the suitability of the soil for septic tank absorption fields. hazard of soil blowing can be reduced by properly
<br /> ' Community sewage systems may be needed because managing all crop residue and by minimizing tillage.
<br /> seepage from onsite sewage disposal systems can If this unit is used for homesite development, the
<br /> result in the contamination of water supplies. Houses, main limitation is the rapid permeability. Community
<br /> ' roads, and streets should be constructed above sewage systems may be needed because seepage
<br /> expected flood levels. from onsite sewage disposal systems can result in the
<br /> This map unit is in capability units Ills-4 (MLRA-17), contamination of water supplies.
<br /> irrigated, and IVe-4 (MLRA-17), nonirrigated. It is in This map unit is in capability units Ills-4 (MLRA-17),
<br /> vegetative soil group B. irrigated, and hie-4 (MLRA-17), nonirrigated. It is in
<br /> vegetative soil group B.
<br /> 255®ToosNn loalmy coarse sand, 0 to 2 percent
<br /> ' slopes, This very deep, well drained, nearly level soil is 256—Tol-tay fine sandy (loam, 0 to 2 percent
<br /> on alluvial fans_ It formed in alluvium derived from slopes. This very deep, well drained, nearly level soil is
<br /> granitic rock sources. Elevation is 20 to 70 feet. The on low fan terraces. It formed in alluvium derived from
<br /> average annual precipitation is about 11 inches, the granitic rock sources. A few areas are dissected by
<br /> ' average annual air temperature is about 60 degrees F, intermittent sloughs that have been filled as a result of
<br /> and the average frost-free period is about 270 days. laud leveling. Elevation is 10 to 125 feet. The average
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