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qian yi ji xie shen song lian he zheng di ji shu
Pages: 130
Year: Issue:  4
Journal: Farm Machinery Using & Maintenance

Abstract:  土壤是农作物生长的最基础条件,在农作物产量构成中,土壤因素虽然约占三分之一,然而其它种子、肥料和栽培条件等增产因素也都要通过土壤才能发挥作用.
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