|
i.
<br />60
<br />I✓
<br />L
<br />r
<br />V
<br />r
<br />r
<br />V
<br />N.
<br />r
<br />r,.
<br />V
<br />v
<br />may be very briefly perched above the hardpan after
<br />periods of heavy rainfall or irrigation. Runoff is very
<br />slow, and the hazard of water erosion is slight. The rate
<br />of water intake in irrigated areas is 1.5 inches per hour.
<br />The hazard of soil blowing is slight. The soil is subject
<br />to rare flooding, which occurs during years of
<br />abnormally high precipitation.
<br />Most areas are used for irrigated crops or vineyards.
<br />A few areas are used for orchards or 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 suited to irrigated row, field, and vineyard
<br />crops. The main limitations are depth to the hardpan
<br />and the low available water capacity. The hardpan limits
<br />the suitability for deep-rooted plants. Where feasible,
<br />deep ripping of this restrictive layer can help to
<br />overcome this limitation. Because the soil is droughty,
<br />applications of irrigation water should be light and
<br />frequent. Furrow, border, and sprinkler irrigation
<br />systems are suitable. Careful applications of irrigation
<br />water are needed to prevent the buildup of a high water
<br />table. A tillage pan forms easily if the soil is tilled when
<br />wet. Chiseling or subsoiling breaks up the pan.
<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 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 Ills -8 (MLRA-17),
<br />irrigated, and IVs -8 (MLRA-17), nonirrigated. It is in
<br />vegetative soil group G.
<br />158—Finrod clay loam, 0 to 2 percent slopes. This
<br />moderately well drained, nearly level soil is on low fan
<br />terraces. It is deep to a hardpan. It formed in alluvium
<br />derived from mixed rock sources. A few areas are
<br />dissected by intermittent sloughs that have been filled
<br />as a result of land leveling. Elevation is 35 to 120 feet.
<br />The average annual precipitation is about 14 inches,
<br />the average annual air temperature is about 60 degrees
<br />F, and the average frost -free period is about 270 days.
<br />Typically, the upper 8 inches of the surface layer is
<br />dark brown clay loam. The lower part of the surface
<br />layer and the upper part of the subsoil are dark brown
<br />and yellowish brown clay about 25 inches thick. The
<br />next part of the subsoil is variegated light yellowish
<br />brown, brown, and strong brown clay about 15 inches
<br />thick. The lower part to a depth of 60 inches is a
<br />Soil Survey
<br />variegated very pale brown and light yellowish brown,
<br />weakly cemented to indurated hardpan. In some areas
<br />the surface layer is clay or silty clay loam.
<br />Included in this unit are small areas of Archerdale,
<br />Cogna, Hollenbeck, and Vignolo soils in landscape
<br />positions similar to those of the Finrod soil. Included
<br />areas make up about 15 percent of the total acreage.
<br />Permeability is slow in the Archerdale soil. Available
<br />water capacity is high. The shrink -swell potential also is
<br />high. The effective rooting depth is limited by the
<br />hardpan at a depth of 40 to 60 inches. Depth to the
<br />water table is more than 6 feet, but water may be very
<br />briefly perched above the hardpan after periods of
<br />heavy rainfall or irrigation. Runoff is slow, and the
<br />hazard of water erosion is slight. The rate of water
<br />intake in irrigated areas is 0.5 inch per hour. The soil is
<br />subject to rare flooding, which occurs during years of
<br />abnormally high precipitation.
<br />Most areas of this unit are used for irrigated crops or
<br />orchards. A few areas are used for homesite
<br />development.
<br />This unit is suited to irrigated row, field, and orchard
<br />crops. The main limitations are the slow permeability
<br />and depth to the hardpan. Because of the restricted
<br />permeability, water applications should be regulated so
<br />that the water does not stand on the surface and
<br />damage the crops. The hardpan limits the suitability for
<br />deep-rooted crops. Where feasible, deep ripping of this
<br />restrictive layer can help to overcome this limitation.
<br />Furrow, border, and sprinkler irrigation systems are
<br />suitable. Careful applications of irrigation water are
<br />needed to prevent the buildup of a high water table.
<br />Returning crop residue to the soil or regularly adding
<br />other organic material improves fertility, minimizes
<br />crusting, and increases the rate of water intake.
<br />If this unit is used for homesite development, the
<br />main limitations are the high shrink -swell potential, low
<br />strength, the slow permeability, and depth to the
<br />hardpan. The rare flooding is a hazard. Properly
<br />designing foundations and footings and diverting runoff
<br />away from buildings help to prevent the structural
<br />damage caused by shrinking and swelling. Properly
<br />designing buildings and roads can offset the limited
<br />ability of the soil to support a load. On sites for septic
<br />tank absorption fields, the slow permeability can be
<br />overcome by increasing the size of the absorption field.
<br />Ripping the hardpan improves permeability and thus
<br />also improves the suitability of the soil for septic tank
<br />absorption fields. Houses, roads, and streets should be
<br />constructed above expected flood 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 />
|