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Application of the various soil and plant sciences to soil management and crop production; scientific agriculture. 農(nóng)學(xué); 農(nóng)藝學(xué)土壤學(xué)和植物學(xué)在土壤管理和作物生產(chǎn)中的應(yīng)用; 科學(xué)農(nóng)業(yè)