PPI/ PPIC has studied the contribution of fertilizers in numerous provinces through maximum economic yield( MEY) research comparing traditional farming practices to an adequate and balanced fertilization approach to crop production.
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- 鉀磷研究所/拿大鉀磷研究所(PI/pic)通過(guò)最高經(jīng)濟產(chǎn)量研究(EY)比較傳統農作措施與充足平衡施肥措施，研究了在大多數省份肥料對作物生產(chǎn)的貢獻。
