肥料是粮食作物的“粮食”，化肥已成为现代农业生产不可或缺的重要生产资料。在我国粮食产量的增量中，据估算有３０％是增施化肥的结果。然而，长期以来，在我国人们普遍注重施用氮肥而忽视磷钾肥，氮磷钾施用结构严重失衡，致使肥料的使用效率和边际效益迅速下滑，农产... Fertilizer is the “food” of food crops and fertilizer has become an indispensable and important means of production in modern agricultural production. In the increment of grain output in our country, it is estimated that 30% is the result of increasing chemical fertilizers. However, for a long time, people in our country have paid great attention to the application of nitrogenous fertilizers while ignoring phosphorus and potassium fertilizers. The structure of NPK is seriously unbalanced, resulting in the rapid decline in the use efficiency and marginal benefit of fertilizers.