Keys to Soil Taxonomy - USDA

United StatesDepartment of AgricultureKeys toSoil TaxonomyTenth Edition, 2006 keys to soil TaxonomyBy soil Survey StaffUnited States Department of AgricultureNatural Resources Conservation ServiceTenth Edition, 2006iiThe Department of Agriculture ( usda ) prohibits discrimination in all its programsand activities on the basis of race, color, national origin, age, disability, and where applicable,sex, marital status, familial status, parental status, religion, sexual orientation, geneticinformation, political beliefs, reprisal, or because all or a part of an individual s income isderived from any public assistance program.

organisms, soil fauna, temperature, and moisture all change with the seasons as well as with more extended periods of time. Soil must be viewed from both the short-term and long-term perspective. Buried Soils A buried soil is covered with a surface mantle of new soil material that either is 50 cm or more thick or is 30 to 50 cm

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