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<br /> _ Soil Survey
<br /> r States, shows that the chief limitation is climate that is climate, topography, vegetation, land use, and general
<br /> I very cold or very dry. type of farming. Parts of four of these nationally
<br /> In class I there are no subclasses because the soils designated areas are In the county. These areas and
<br /> of this class have few limitations. Class V contains only their numbers are Central'Cafifornia Coast Range,
<br /> the subclasses indicated by w, s, or c because the soils MLRA-15; California Delta, MLRA•16; Sacramento and
<br /> in class V are subject to little or no erosion. They have San Joaquin Valley, MLiRA-17; and Sierra Nevada
<br /> other limitations that restrict their use to pasture, Foothills, MLRA-18. The major land resource area
<br /> rangeland, wildlife habitat, or recreation,
<br /> number is added.In parentheses after the land
<br /> Capability units are soil groups within a subclass. capability class, subclass, or unit designation at the end
<br /> The soils in a capability unit are enough alike to be of each map unit description in the section "Detailed
<br /> suited to the same crops and pasture plants, to require 5oii Units."
<br /> J similar management, and to have similar productivity. A soil in one resource area may have characteristics
<br /> Capability units are generally designated by adding an similar to chose of a soil In another resourceiarea and
<br /> Arabic numeral to the subclass symbol, for example, have the same capability symbol, but the climate,
<br /> IIs-5 and Ilw-2. The numbers used to designate units vegetation, suitable crops, and needed management
<br /> within the subclasses are as follows: practices may differ. For example, both capability unit
<br /> 0. Indicates limitations caused by stony, cebbly, or Ilw-2 (MLRA-16) and llw-2 (MLRA-17) consist of very
<br /> gravelly material In the substratum. deep soils. The soils in capability unit ilw-2 (MLRA-16)
<br /> 1. Indicates limitations caused by slope or by an are in the California Delta. They are poorly suited to
<br /> f actual or potential erosion hazard, most deep-rooted crops because of the seasonal high
<br /> 2. Indicates a limitation of wetness caused by poor water table. Those in capability unit Ilw-2 (MLRA-17)
<br /> y;. drainage or flooding. are in the Sacramento and San Joaquin Valley. They
<br /> 3. Indicates a limitation of slaw or very slow are occasionally flooded but are suited to deep-rooted
<br /> permeabiiity in the subsoil or substratum. crops in most areas_
<br /> 4. Indicates a low available water capacity in sandy MLRA-75, the Central California Coast Flange,—The
<br /> or gravelly sons. mountains of the Coast Range, which are in the
<br /> 5, Indicates limitations caused by a tine textured or southwestern part of the county, are in this major land
<br /> very fine textured surface Payer. resource area. Most of the soils are shallow or
<br /> 6. Indicates limitations caused by salts or sodium, moderately deep to bedrock and are steep or very
<br /> 7. indicates limitations caused by rocks, stones, or steep.
<br /> {
<br /> cobblestones. The natural vegetation is mainly annual grasses and
<br /> f
<br /> S. Indicates that the soil has a very low or low forbs in the northeastern part of the Coast Range and
<br /> available water capacity because the root zone mixed annuai grasses, forbs, shrubs, and blue oak in
<br /> k generally is less than 40 Inches deep over a hardpan or the southwestern part. Elevation ranges from 300 to
<br /> l massive bedrock. 3,300 feet. The average annual precipitation is 10 to 18
<br /> 9. Indicates that a problem or limitation is caused inches. The average annual air temperature is 60.to 61
<br /> by low or.very low fertility associated with strong acidity; degrees i and the average frost-free period is 200 to
<br /> a lour caldum-magnesium ratio; or excess sodium, 270 days,
<br /> baron, or molybdenum. The part of the county in this resource area generally
<br /> 10. indicates that a problem or limitation, such as is used for livestock grazing. A few areas are used for
<br /> subsidence or susceptibility to burning or soil blowing, is more intensive purposes, such as off-highway vehicle
<br /> a' caused by a high content of organic matter. recreation areas and industrial development.
<br /> i The irrigated and nonirrigated capability classification Throughout most of the area, the supply of ground
<br /> of each map unit is shown in table B and in the section water Is very limited and streamflow is intermittent.
<br /> "Detailed Soil Map Units." If a scif Is not irrigable, only Water for livestock is provided by stock ponds,'which
<br /> the nonirrigated capability classification is shown. are in scattered areas. Water for domestic and
<br /> Miscellaneous areas are not assigned a capability industrial uses is llmfted,in quantity and poor in quality.
<br /> classification. This area provides valuable habitat for wildlife.
<br /> ?Major Land Resource ,areas MLRA-16, the California Delta.—The Sacramento-San
<br /> F1 Joaquin Delta, which is at the confluence of the
<br /> The land capability classification system is further Sacramento and San Joaquin Rivers in the western part
<br /> refined by designating the major land resource area of the county, is in this major land resource area. The
<br /> INAI AAA of tho eniic A lanrl rraanllrr.;a arae is n hrnarf
<br /> rialla is diviAart by rivers and slpucshs into a lame
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<br /> Land Capability Classification
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