作物正常生长发育需要多种微量元素，严重缺少时，作物常停止生长，甚至死亡。各种元素对作物生长都十分重要，不能相互代替。微量元素只需少量就可满足作物正常生长的需要。但各种微量元素从缺乏到过量的临界范围是很小的。因此，施用微量元素肥料时要十分慎重。 1施微肥不要 Crops require a variety of normal growth and development of trace elements, a serious shortage of crops often stop growing, or even death. Various elements of crop growth are very important, can not be replaced by each other. Only a small amount of trace elements to meet the normal crop needs. However, the critical range of various trace elements from deficiency to overdose is very small. Therefore, the application of trace element fertilizer should be very careful. 1 fertilizer do not