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植物的灰分中含有极微量的鋅,很早就被人发現了,但是作为植物生育上不可缺的一个成份,是近年来才发現的。 鋅是鉛铁、白鉛、銲藥、黄銅等制造所必須的金属,也是制造电池的一种原料。天然的鋅存在于閃鋅矿或出現于菱鋅矿中。溶于酸就成为硫酸鋅,鹽酸鋅等各种化合物。土壤若含过量的鋅的矿石,那末植物就会中矿毒,但是它的被害程度比銅为低。最近有个例子,長崎县的对馬佐須村佐須河的中游地帶,麦子、莲华草等都生長不好,而且面积很大,經專家們的調查,原来是河的上游有个鋅矿,由于雨水的冲刷这些矿石和矿山中排出的水中含有鋅,大量的鋅使植物中了矿毒。
Plant ash contains trace amounts of zinc, has long been discovered, but as an integral part of plant fertility, found only in recent years. Zinc is a lead-iron, white lead, solder, brass and other metal necessary for manufacturing, but also a battery of raw materials. Natural zinc exists in sphalerite or occurs in calamine. Soluble in acid to become zinc sulfate, zinc chloride and other compounds. If the soil contains an excessive amount of zinc ore, the plant will be mined, but it is harder than copper. In a recent example, in Nagasaki Prefecture, the middle reaches of the Zuoxu River in Mazusu village, wheat and Lianhua grass are poorly-developed and large in area. According to the experts’ investigation, it turns out that there is a zinc mine in the upper reaches of the river, Due to the scouring of rainwater from these ores and mines, zinc is contained in a large amount of zinc, causing the plants to be mined.