中国制的粉粒是指直径为0.05-0.002mm的土壤颗粒,胶粒是...
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作物缺钾的症状一般最先在()表现出症状,水稻缺钾的主要症状是()...
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钾充足,不但能使作物产量增加,而且可以改善作物品质,如...
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