SU0010676 SSNL - Laserfiche WebLink

Home Browse Search

98 Soil Survey soils on terraces, Keyes soils in landscape positions Pentz soil. The characteristic plant community is mainly ' similar to those of the Pentz and Bellota soils, and soft chess, ripgut brome, and filaree on the Pentz soil Peters soils in the slightly lower positions. Also included and soft chess, mouse barley, annual ryegrass, and are small areas of soils that have clay at the surface filaree on the Bellota soil. The very low or low available ' and, near Bear Creek, small areas of moderately fine water capacity limits the production of desirable forage textured soils that have a hardpan and formed in plants. Grazing should be delayed until the soils are material weathered from granitic sediments. Included firm enough to withstand trampling by livestock and the areas make up 15 percent of the total acreage. more desirable forage plants have had an opportunity to t The Pentz soil is shallow and well drained. It formed set seed. Grazing should be controlled so that desirable in material weathered from basic andesitic, tuffaceous vegetation, such as soft chess, is maintained and sandstone. Typically, the surface layer is grayish brown enough vegetation is left standing to protect the soils ' loam about 7 inches thick. The subsoil is dark brown from erosion. Loss of the surface layer results in a loam about 7 inches thick. Light yellowish brown, severe decrease in productivity and in the potential of weakly consolidated, basic andesitic, tuffaceous the unit to produce plants suitable for grazing. Fencing sandstone bedrock is at a depth of 14 inches. In some is difficult because of the depth to bedrock. ' areas the surface layer is sandy loam, gravelly loam, or This map unit is in capability subclass Vie cobbly loam. (MLRA-18), nonirrigated. The Pentz soil is in vegetative Permeability is moderately rapid in the Pentz soil. soil group G, the Bellota soil is in vegetative soil group Available water capacity is very low. The effective D. rooting depth is limited by The bedrock at a depth of 10 to 20 inches. Runoff is slow or medium, and the hazard 210—Pentz-Redding complex, 2 to 15 percent of water erosion is slight or moderate. slopes. These undulating to rolling soils are on hills and ' The Bellota soil is moderately deep to a hardpan and the side slopes of high terraces. Slopes are convex. is moderately well drained. It formed in alluvium derived The native vegetation is mainly annual grasses and from mixed rock sources and in material weathered (orbs. Elevation is 135 to 300 feet. The average annual ' from basic andesitic, tuffaceous sandstone. Typically, precipitation is about 17 inches, the average annual air the surface layer is grayish brown loam about 17 inches temperature is about 60 degrees F, and the average thick. The upper part of the subsoil is brown gravelly frost-free period is about 270 days. clay loam about 4 inches thick. The next part is a This unit is 55 percent Pentz gravelly sandy loam ' claypan of dark grayish brown clay about 15 inches and 30 percent Redding gravelly sandy loam. The thick. The lower part is a light grayish brown hardpan components of this unit occur as areas so intricately about 1 inch thick. Light gray, moderately consolidated, intermingled that it was not practical to map them ' basic andesitic, tuffaceous sandstone bedrock is at a separately at the scale used. depth of 37 inches. In some areas the surface layer is Included in this unit are small areas of Redding soils sandy loam, gravelly loam, or cobbly loam. that have slopes of 0 to 2 percent. These soils are on Permeability is very slow in the Bellota soil. Available toe slopes. Also included are small areas of Lithic ' water capacity is low. The shrink-swell potential is high. Xerorthents in convex positions near the top of the The effective rooting depth is limited by the hardpan, slopes and Hicksville soils in drainageways. Included which is at a depth of 20 to 40 inches and is underlain areas make up about 15 percent of the total acreage. ' by bedrock. Roots are restricted to cracks and the faces The Pentz soil is shallow and well drained. It formed of peds in the claypan, which is at a depth of 12 to 30 in material weathered from consolidated sediments inches. Water is briefly perched above the claypan and derived from basic andesitic rock sources. Typically, the hardpan after periods of heavy rainfall. Runoff is slow or surface layer is grayish brown gravelly sandy loam ' medium, and the hazard of water erosion is slight or about 10 inches thick. The subsoil is yellowish brown moderate. gravelly sandy loam about 4 inches thick. Light gray, Most areas are used for livestock grazing. This unit moderately consolidated, basic andesitic, tuffaceous ' may provide wetland functions and values. These sandstone bedrock is at a depth of 14 inches. In some should be considered in plans for enhancement of areas the surface layer is sandy loam, loam, or gravelly wildlife habitat or land use conversion. loam. Where this unit is used for livestock grazing, general Permeability is moderately rapid in the Pentz soil. ' management considerations include the very low or low Available water capacity is very low. The effective available water capacity, saturated soil conditions in rooting depth is limited by the bedrock at a depth of 10 concave areas following rainy periods, the hazard of to 20 inches. Runoff is slow or medium, and the hazard ' erosion in rolling areas, and the limited depth of the of water erosion is slight or moderate.