Two grades of yearly input of organic fertilizer has been suggested for the organic matter balance of medium or low productive soil respectively.
提出了中、低产田在各保持两个量级有机质平衡对，每年应投入各有机物料的数量。
Two grades of yearly input of organic fertilizer has been suggested for the organic matter balance of medium or low productive soil respectively.
提出了中、低产田在各保持两个量级有机质平衡对，每年应投入各有机物料的数量。
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