铁、硼、锰、铜、锌、氯等元素,在化学肥料中称微量元素,即微肥。微量元素在植物体内含量约占干物质重量的十万分之几到千分之几。尽管含量很少,但在植物体内是酶和辅酶的组成部分,是植物生长、发育所必需的,且具有不可替代性。在农业生产中,随着氮、磷、钾肥的大量施用和土地复种指数的提高,微量元素的需要 Iron, boron, manganese, copper, zinc, chlorine and other elements, said in the chemical fertilizer trace elements, namely, trace fertilizers. Trace elements in the plant content of about one hundred thousandths of dry matter weight to a few thousandths. Despite its low content, it is an integral part of enzymes and coenzymes in plants. It is necessary for plant growth and development and has irreplaceability. In agricultural production, with the large-scale application of N, P and K fertilizers and the improvement of crop multiplication index, the demand of trace elements