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' 72 Soil Survey
<br /> ' irrigated, and IVe-5 (MLRA-17), nonirrigated. It is in intricately intermingled that it was not practical to map
<br /> vegetative soil group C. them separately at the scale used.
<br /> Included in this unit are small areas of Honker,
<br /> 175—Honcut sandy loam, 6t 2 percent slopes. Gonzaga, and Vallecitos soils that have slopes of more
<br /> This very deep, well drained, nearly level soil is on than 50 or less than 30 percent and small areas of
<br /> alluvial fans. It formed in alluvium derived from granitic Franciscan soils. All of these included soils are in
<br /> rock sources. Elevation is 30 to 125 feet. The average landscape positions similar to those of the dominant
<br /> annual precipitation is about 11 inches, the average Honker, Vallecitos, and Gonzaga soils. Also included
<br /> annual air temperature is about 60 degrees F, and the are areas of exposed bedrock and eroded Honker soils
<br /> average frost-free period is about 270 days. in convex positions near the top of the slopes. Included
<br /> Typically, the surface layer is brown sandy loam areas make up about 15 percent of the total acreage.
<br /> ' about 21 inches thick. The underlying material to a The Honker soil is moderately deep and well drained.
<br /> depth of 60 inches is brown and yellowish brown sandy It formed in material weathered from sandstone.
<br /> loam. In some areas the surface layer is fine sandy Typically, the surface layer is brown loam about 5
<br /> ' loam, coarse sandy loam, or gravelly sandy loam. inches thick. The subsoil is a claypan of brown and
<br /> Included in this unit are small areas of Chuloak, strong brown gravelly clay about 28 inches thick. Hard
<br /> Delhi, Tinnin, and Veritas soils in landscape positions sandstone bedrock is at a depth of 33 inches. In some
<br /> similar to those of the Honcut soil. Included areas make areas the surface layer is gravelly loam, gravelly clay
<br /> ' up about 15 percent of the total acreage. loam, or clay loam.
<br /> Permeability is moderately rapid in the Honcut soil. Permeability is very slow in the Honker soil. Available
<br /> Available water capacity is moderate. The effective water capacity is low. The shrink-swell potential is high.
<br /> rooting depth is 60 inches or more. Runoff is slow, and The effective rooting depth is limited by the bedrock at
<br /> the hazard of water erosion is slight. The rate of water a depth of 20 to 40 inches. Roots are restricted to
<br /> intake in irrigated areas is 1.5 inches per hour. The cracks and the faces of peds in the claypan, which is at
<br /> hazard of soil blowing is moderate. a depth of 10 to 20 inches. Runoff is rapid, and the
<br /> ' Most areas of this unit are used for irrigated crops, hazard of water erosion is severe.
<br /> orchards, or vineyards. A few areas are used for The Vallecitos soil is shallow and well drained. It
<br /> homesite development. formed in material weathered from sandstone. Typically,
<br /> This unit is well suited to irrigated row, field, orchard, the surface layer is pale brown gravelly loam about 4
<br /> and vineyard crops. General management inches thick. The subsoil is pale brown and brown
<br /> considerations include the hazard of soil blowing. gravelly clay loam about 16 inches thick. Hard
<br /> Furrow, border, and sprinkler irrigation systems are sandstone bedrock is at a depth of 20 inches. In some
<br /> ' suitable. A tillage pan forms easily if the soil is tilled areas the surface layer is loam, clay loam, or gravelly
<br /> when wet. Chiseling or subsoiling breaks up the pan. clay loam.
<br /> When the wind velocity is high in spring, the hazard of Permeability is slow in the Vallecitos soil. Available
<br /> ' soil blowing can be reduced by properly managing all water capacity is very low. The shrink-swell potential is
<br /> crop residue and by minimizing tillage. high. The effective rooting depth is limited by the
<br /> Few limitations affect the use of this unit for homesite bedrock at a depth of 10 to 20 inches. Runoff is rapid,
<br /> development, and the hazard of water erosion is severe.
<br /> ' This map unit is in capability class I (MLRA-17), The Gonzaga soil is moderately deep and well
<br /> irrigated, and capability unit IVc-1 (MLRA-17), drained. It formed in material weathered from shale.
<br /> nonirrigated. It is in vegetative soil group A. Typically, the upper 3 inches of the surface layer is
<br /> grayish brown loam. The lower 4 inches is grayish
<br /> 176—Honker-Vallecitos-Gonzaga complex, 30 to 50 brown clay loam. The subsoil is a claypan of reddish
<br /> percent slopes. These steep soils are on both south- brown and light reddish brown clay about 27 inches
<br /> facing and north-facing slopes on mountains. The native thick. Hard shale bedrock is at a depth of 34 inches. In
<br /> vegetation is mainly annual grasses, (orbs, and blue some areas the surface layer is gravelly loam or
<br /> oak. Elevation is 800 to 3,300 feet. The average annual gravelly clay loam.
<br /> precipitation is 12 to 18 inches, the average annual air Permeability is very slow in the Gonzaga soil.
<br /> ' temperature is about 60 degrees F, and the average Available water capacity is low. The shrink-swell
<br /> frost-free period is 200 to 240 days. potential is high. The effective rooting depth is limited
<br /> This unit is 30 percent Honker loam, 30 percent by the bedrock at a depth of 20 to 40 inches. Roots are
<br /> Vallecitos gravelly loam, and 25 percent Gonzaga loam. restricted to cracks and the faces of peds in the
<br /> The components of this unit occur as areas so claypan, which is at a depth of 4 to 20 inches. Runoff is
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