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30 percent 60 inches 9 percent alluvial fans alluvium Altamont annual grasses available water capacity average annual rainfall Capability unit coarse common dark grayish brown described as representative dryfarmed small grain effective rooting depth Elevation ranges erosion feet friable frost-free season grasses and forbs grayish brown 10YR grayish-brown habitat heavy clay loam high shrink-swell potential horizon ranges igneous rock inches thick legumes loam in texture mapping are small medium acid moderately alkaline moderately slow Mollisols montmorillonitic mottles when moist nearly level ped faces percent slopes piping hazard plants poorly drained rainfall is 16 recreation representative profile Runoff is slow San Ysidro sandstone season is 250 shear strength silty clay loam slight hazard slightly acid slightly plastic slightly sticky slow permeability small areas smooth boundary soil in mapping soils formed Solano County sorghum subsoil substratum sugar beets tubular pores water intake water table wavy boundary wildlife habitat yellowish yellowish-brown 10YR
Page 46 - Class VI soils have severe limitations that make them generally unsuited to cultivation and limit their use largely to pasture or range, woodland, or wildlife food and cover.
Page 46 - II soils have some limitations that reduce the choice of plants or require moderate conservation practices. Class HI soils have severe limitations that reduce the choice of plants or require special conservation practices, or both. Class IV soils have very severe limitations that restrict the choice of plants , require very careful management, or both.
Page 72 - AASHO procedure, the fine material is analyzed by the hydrometer method and the various grain-size fractions are calculated on the basis of all the material, including that coarser than 2 millimeters in diameter. In the SCS soil survey procedure, the fine material is analyzed by the pipette method and the material coarser than 2 millimeters in diameter is excluded from calculations of grain-size fractions.
Page 2 - ... structure, because the soils in any one association ordinarily differ in slope, depth, stoniness, drainage, and other characteristics that affect their management. More detailed information about the soils is given in the section "Descriptions of the Soils.
Page 1 - ... kinds of rock, and many facts about the soils. They dug many holes to expose soil profiles. A profile is the sequence of natural layers, or horizons, in a soil; it extends from the surface down into the parent material that has not been changed much by leaching or by the action of plant roots. The soil scientists made comparisons among the profiles they studied, and they compared these profiles with those in counties nearby and in places more distant. They classified and named the soils according...
Page 46 - States, shows that the chief limitation is climate that is too cold or too dry. In class I there are no subclasses, because the soils of this class have few limitations.
Page 46 - Class VII soils have very severe limitations that make them unsuited to cultivation and that restrict their use largely to grazing, woodland, or wildlife. Class VIII soils and landforms have limitations that preclude their use for commercial plant production.
Page 1 - County, where they are located, and how they can be used. The soil scientists went into the county knowing they likely would find many soils they had already seen and perhaps some they had not.
Page 46 - ... horticultural crops, or other crops requiring special management. Those familiar with the capability classification can infer from it much about the behavior of soils when used for other purposes, but this classification is not a substitute for interpretations designed to show suitability and limitations of groups of soils for range, for forest trees, or for engineering.