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钾和氮。磷一样，是植物生长所不可缺少的重要元素之一。据资料记载：钾肥可以促进作物对氮素的吸收利用，有利于蛋白质的形成。同时还能增加作物的抗倒伏性和抗病能力。作物缺钾，根就会停止生长分枝，并易发生根腐病。棉花缺钾后期会出现红叶茎枯病，造成早衰，造成铃重降低
Potassium and nitrogen. Like phosphorus, it is one of the most important elements of plant growth. According to the information records: Potassium fertilizer can promote crop nitrogen absorption and utilization, is conducive to the formation of protein. At the same time can also increase the crop lodging resistance and disease resistance. Crop potassium, roots will stop growing branches, and prone to root rot. Cotton potassium deficiency will appear late leaf stem blight, causing premature aging, resulting in reduced bell weight