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植物要維持生命活动,不仅需要不断从土壤中摄取多量氮、磷、钾等元素,而且还必须摄取微量的硼、锌、锰、钼、铜、铁、鈷等元素。前者叫大量元素,后者叫微量元素。虽然植物对后者的需要量是微不足道的,但却是不可缺少的。植物一旦得不到这些元素,种种疾病就要降临,輕則影响植物正常的生长发育,重則导致死亡。微量元素銅就是个典型的例子。缺铜病一般只要土壤中合有0.002％(十万分之二)左右的铜就能满足
In order to maintain the life activities of plants, it is necessary not only to continuously intake a large amount of nitrogen, phosphorus, and potassium from the soil, but also to absorb trace elements such as boron, zinc, manganese, molybdenum, copper, iron, and cobalt. The former is called a large number of elements, the latter called trace elements. Although the demand for the latter by plants is insignificant, it is indispensable. Once the plants do not get these elements, various diseases will come. Lightly affect the normal growth and development of plants, and it will lead to death. Trace element copper is a typical example. Copper deficiency is generally met if there is 0.002% (about 2/100,000) of copper in the soil.