微量元素在植物体内虽然仅含万分之几,甚至十万分之几,但是它们在植物生理功能上却起着特殊重要的作用。现已查明,植物不可缺少的微量营养元素有钼、硼、锰、锌、铜、铁、钴等。锰、锌、铁供应不足时,植物的叶绿素减少而发生失绿现象,光合作用也随之减弱。 Although trace elements in plants contain only a few percent, or even a few hundred thousandths, but they play a particularly important role in plant physiology. It has been identified, essential plant micronutrients are molybdenum, boron, manganese, zinc, copper, iron, cobalt and so on. When the supply of manganese, zinc and iron is not enough, the chlorophyll of plants is reduced and the chlorosis occurs, and the photosynthesis also decreases.