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These levels are defined as follows: <br /> • Capability classes, the broadest groups, are designated by Roman numerals I through VIII. <br /> The numerals indicate progressively greater limitations and narrower choices for practical <br /> use. The classes are defined as follows: <br /> • Class I soils have few limitations that restrict their use. <br /> • Class II soils have moderate limitations that reduce the choice of plants or that require <br /> moderate conservation practices. <br /> • Class III soils have severe limitations that reduce the choice of plants or that require <br /> special conservation practices, or both. <br /> • Class IV soils have very severe limitations that reduce the choice of plants or that <br /> require very careful management,or both. <br /> • Class V soils are not likely to erode but nave other limitations, impractical to remove, <br /> that limit their use. <br /> • Class VI soils have severe limitations that make them generally unsuitable for <br /> cultivation. <br /> • Class VII soils have very severe limitations that make them unsuitable for cultivation. <br /> • Class VIII soils and miscellaneous areas have limitations that nearly preclude their use <br /> for commercial crop production. <br /> • Capability subclasses are soil groups within one class. They are designated by adding a small <br /> letter,e,w, s,or c, to the class numeral,for example, Ile. <br /> • "e" shows that the main hazard is the risk of erosion unless close growing plant cover is <br /> maintained. <br /> • *"w" shows that water in or on the soil interferes with plant growth or cultivation. <br /> • "s" shows that the soil is limited mainly because it is shallow,droughty,or stony. <br /> • "c" shows that the chief limitation is climate that is very cold or very dry. <br /> " "w"reaoives the rewntton of organic matter <br /> °Western Design/David Avila 2001 I 1 <br />