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论述钾在农作物生长中的作用，分析土壤缺钾的原因，介绍作物缺钾症状、钾肥的施用方法及若干作物钾肥的一般施用量。
Discussed the role of potassium in crop growth, analyzed the causes of potassium deficiency in soils, introduced the symptoms of crop potassium deficiency, application methods of potash fertilizer and the general application amount of potash fertilizer of several crops.