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作物体内的微量元素含量一般为万分之几至十万分之几,虽然数量微小,但却是作物正常生活和生长所不可缺少的。微量元素有专一性,不能被其他元素所代替。例如,氮磷钾肥就不能代替微量元素肥料施用。作物缺乏微量元素会减少产量和降低品质,施用过量又会发生中毒现象。主要微量元素有钼、硼、锌、锰、铜等。有人将铁也列为微量元素,不过它在作物体内的含量并不太少,一般可达0.3％左右。
The content of trace elements in crops is generally a few hundred thousandths to a few hundred thousandths, although a small number, but it is indispensable to the normal crop life and growth. Trace elements are specific, can not be replaced by other elements. For example, NPK fertilizers can not be used in place of trace element fertilizers. Lack of trace elements in crops can reduce yields and reduce quality, and poisoning can occur when over-applied. The main trace elements are molybdenum, boron, zinc, manganese, copper and so on. Iron is also listed as a trace element, but it is not too low in the body of the crop, generally up to about 0.3%.