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42 Soil Survey
<br /> Most areas of this unit are used for irrigated crops or This unit is well suited to irrigated row, field, and
<br /> orchards. A few areas are used for homesite orchard crops. It has few limitations. Furrow, border,
<br /> development. and sprinkler irrigation systems are suitable. Returning
<br /> This unit is well suited to irrigated row, field, and crop residue to the soil or regularly adding other organic I
<br /> orchard crops.,General management considerations material improves fertility, minimizes crusting, and
<br /> include the hazard of soil blowing. Furrow, border, and maintains the rate of water intake.
<br /> sprinkler irrigation systems are suitable. When the wind If this unit is used for homesite development, general
<br /> velocity is high.'in spring, the hazard of soil blowing can management considerations include the hazard of rare
<br /> be reduced by.properly managing all crop residue and flooding. Houses, roads, and streets should be
<br /> by minimizing tillage. constructed above expected flood levels.
<br /> If this unit is.used for homesite development, the This map unit is in capability class I (MLRA-17),
<br /> main limitation is the moderately slow permeability. On irrigated, and capability unit IVc-1 (MLRA-17),
<br /> sites for septic tank absorption fields, the restricted nonirrigated. It is in vegetative soil group A.
<br /> permeability can be overcome by increasing the size of '
<br /> the absorption field. 129—Cogna Idam, 0 to 2 percent slopes. This very
<br /> t This map unit is in capability class I (MLRA-17), deep, well drained, nearly level soil is on low fan
<br /> irrigated, and capability unit IVc-1 (MLRA-17), terraces. It formed in alluvium derived from mixed rock a
<br /> nonirrigated. It is in vegetative soil group A. sources. A few areas are dissected by intermittent 3
<br /> sloughs that have been filled as a result of land
<br /> 128—Cogna fine sandy loam, 0 to 2 percent leveling. Elevation is 40 to 130 feet. The average
<br /> slopes, overwashed. This very deep, well drained, annual precipitation is about 16 inches, the average ;a
<br /> nearly level soil is on alluvial fans. It formed in alluvium annual air temperature is about 60 degrees F, and the "I
<br /> derived from mixed rock sources. A few areas are average frost-free period is about 270 days.
<br /> dissected by intermittent sloughs that have been filled Typically, the surface layer is dark grayish brown and
<br /> as a result of land leveling. Elevation is 70 to 150 feet. dark brown loam about 25 inches thick. The subsoil and
<br /> The average annual precipitation is about 16 inches, the underlying material to a depth of 64 inches are
<br /> the average annual air temperature is about 60 degrees brown clay loam and pale brown and brown loam. In
<br /> F, and the average frost-free period is about 270 days. some areas the surface layer is clay loam or silt loam.
<br /> Typically, the surface layer is brown fine sandy loam Included in this unit are small areas of Archerdale,
<br /> about 18 inches thick. Below this is a buried surface Boggiano, and Vignolo soils in landscape positions
<br /> layer of dark grayish brown loam about 20 inches thick. similar to those of the Cogna soil. Also included are
<br /> The subsoil and the underlying material to a depth of 60 small areas of Columbia soils in the slightly lower
<br /> inches are dark grayish brown loam and silt loam. In positions. Included areas make up about 15 percent of
<br /> some areas the surface layer is loam or silt loam. the total acreage.
<br /> Included inthis unit are small areas of Archerdale Permeability is moderate in the Cogna soil. Available
<br /> soils in landscape positions similar to those of the water capacity is high. The effective rooting depth is 60
<br /> Cogna soil and Columbia soils in the slightly lower inches or more. Runoff is slow, and the hazard of water
<br /> positions. Also included are small areas of Cogna soils erosion is slight. The rate of water intake in irrigated
<br /> that have moderately coarse textured overwash layers areas is 1.0 inch per hour. The soil is subject to rare
<br /> up to 35 inches thick. Included areas make up about 15 flooding, which occurs during years of abnormally high
<br /> percent of the total acreage. precipitation.
<br /> Permeability is moderate in the Cogna soil. Available Most areas are used for irrigated crops or orchards.
<br /> water capacity ,is high. The effective rooting depth is 60 A few areas are used for homesite development. This
<br /> inches or more. Runoff is slow, and the hazard of water unit may provide wetland functions and values. These
<br /> erosion is slight. The rate of water intake in irrigated should be considered in plans for enhancement of
<br /> areas is 1.5 inches per hour. The soil is subject to rare wildlife habitat or land use conversion.
<br /> flooding, which occurs during years of abnormally high This unit is well suited to irrigated row, field, and
<br /> precipitation. ', orchard crops. It has few limitations. Furrow, border,
<br /> Most areas are used for irrigated crops or orchards. and sprinkler irrigation systems are suitable. Returning
<br /> A few areas are used for homesite development. This crop residue to the soil or regularly adding other organic-
<br /> unit
<br /> rganicunit may provide wetland functions and values. These material improves fertility, minimizes crusting, and
<br /> should be considered in plans for enhancement of increases the rate of water intake.
<br /> a wildlife habitat or land use conversion. If this unit is used for homesite development, general
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