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90 v Soil Survey this restrictive layer can help to overcome this limitation. depth of 60 inches is yellowish red and reddish yellow, A tillage pan forms easily if the soil is tilled when wet. dense, weakly cemented sandy loam. In some areas Chiseling or subsoiling breaks up the pan. Annual the surface layer is sandy loam. cultivation should be avoided on the steeper slopes. All Permeability is moderately slow in the upper part of tillage should be on the contour or across the slope. If the Montpellier soil and very slow in the dense subsoil.' the soil is plowed in fall, runoff and erosion can be Available water capacity is moderate. The effective ` controlled by applying fertilizer and seeding a cover rooting depth is more than 60 inches but roots are crop. Sprinkler and drip irrigation systems are suitable. restricted to cracks and the faces of peds in the dense They permit an even, controlled application of water, subsoil, which is at a depth of 40 to 60 inches. Depth t help to prevent excessive runoff, and minimize the risk the water table is more than 6 feet, but water may be of erosion. Returning crop residue to the soil or briefly perched above the dense subsoil or underlying regularly adding other organic material improves fertility, sediments after periods of heavy rainfall or irrigation. . minimizes crusting, and maintains the rate of water Runoff is medium, and the hazard of water erosion is intake. moderate. The rate of water intake in irrigated areas is It this unit is used for homesite development, the 1.5 inches per hour. main limitations are the depth to dense, weakly The Cometa soil is moderately deep to dense, ` cemented sediments and the moderately slow weakly cemented sediments and is moderately well permeability. General management considerations drained. It formed in old alluvium derived from granitic include the hazard of erosion. The cuts needed to rock sources. Typically, the surface layer is brown provide essentially level building sites can expose the sandy loam about 22 inches thick. The upper part of th dense subsoil. On sites for septic tank absorption fields, subsoil is a claypan of brown sandy clay about 14 the moderately slow permeability can be overcome by inches thick. The lower part to a depth of 60 inches is increasing the size of the absorption field. Excavation brown, dense, weakly cemented sandy loam and san for roads and buildings increases the hazard of erosion. clay loam. In some areas the surface layer is coarse This map unit is in capability unit IVe-1 (MLRA-17), sandy loam. irrigated and nonirrigated. It is in vegetative soil group Permeability is very slow in the Cometa soil. A. Available water capacity is moderate. The shrink-swell potential is high. The effective rooting depth is limited , 200—Montpellier-Cometa complex, 5 to 8 percent by the dense, weakly cemented sediments at a depth slopes. These gently rolling soils are on dissected 24 to 40 inches. Roots are restricted to cracks and the terraces. The native vegetation is mainly annual faces of peds in the claypan, which is at a depth of 17 grasses and (orbs and scattered California white oak. to 25 inches. Depth to the water table is more than 6 Elevation is 120 to 300 feet. The average annual feet, but water may be briefly perched above the b. precipitation is about 16 inches, the average annual air claypan or underlying sediments after periods of heavy temperature is about 60 degrees F, and the average rainfall or irrigation. Runoff is medium, and the hazard frost-free period is 260 to 275 days. of water erosion is moderate. The rate of water intake ' This unit is 50 percent Montpellier coarse sandy loam irrigated areas is 1.5 inches per hour. and 35 percent Cometa sandy loam. The components Most areas of this unit are used for livestock grazing of this unit occur as areas so intricately intermingled or dryland grain crops. A few areas are used for that it was not practical to map them separately at the irrigated orchards or vineyards or for homesite scale used. development. Included in this unit are small areas of Kaseberg, Where this unit is used for livestock grazing, general Ramoth, and Redding soils on terraces and Rocklin and management considerations include the hazard of San Joaquin soils in the slightly lower landscape erosion and saturated soil conditions in concave areas positions. Included areas make up about 15 percent of following rainy periods. The characteristic plant the total acreage. community is mainly soft chess, ripgut brome, wild oat, The Montpellier soil is deep to dense, weakly and filaree. Grazing should be controlled so that cemented sediments and is moderately well drained. It desirable vegetation, such as soft chess, is maintain formed in old alluvium derived from granitic rock and enough vegetation is left standing to protect the sources. Typically, the surface layer is brown and light soils from erosion. Grazing should be delayed until th r reddish brown coarse sandy loam about 20 inches soils are firm enough to withstand trampling by livest thick. The upper 23 inches of the subsoil is light reddish and the more desirable forage plants have had an brown sandy clay loam. The next 12 inches is light opportunity to set seed. ` reddish brown coarse sandy loam. The lower part to a Where this unit is used for dryland grain crops, the r