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A Measure of the
Resolution AMERICAN SOIL SURVEY ASSOCIATION
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accumulation acres acteristics adaptability agricultural Amazon Basin Amazon valley American basis brown bushels cent century chemical Chernozem Chernozem belt Chestnut soils clay climatic consists constitute crops cultivation dark colored defined definition determined developed soils differentiation Doctor Marbut environment fact factors forest fundamental geographic geological formations grain grass grassland group of soils important inches increase indurated influence iron oxide kind knowledge land large areas laterite layer lime carbonate loam mature soil Missouri moisture natural normal organic matter parent material parent rock Pedalfers Pedocals pedologists Pedology percentage plants podsolic possible present processes production rainfall range region relationship relatively Russia sand sandy second horizon soil character soil characteristics soil classification soil development soil groups soil horizons soil map soil material soil profile soil science Soil Survey soil units stage subsoil surface horizon temperature texture thickness tion Tschernosem vegetation western Europe wheat zone