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USDA Natural Resources Conservation Service January 1998
www.nrcs.usda.govsources. In natural systems, the pH is affected by the mineralogy, climate, and weathering. Management of soils Soil Quality Information Sheet Soil Quality Indicators: pH USDA Natural Resources Conservation Service January 1998
USDA - Natural Resources Conservation Service
prod.nrcs.usda.govNRCS National Centers and Divisions Personnel Directory 5/22/2014 . USDA - Natural Resources Conservation Service . N. A. T. I. O. N. A. L. C. E. N. T. E. R