微量元素对蔬菜的生长发育起着大量元素无法替代的作用,一旦某种微量元素缺乏,蔬菜就会表现出相应的缺素症状。但许多微量元素从缺乏到过量之间的临界范围很窄,如果使用微肥的量过大或不均匀,往往会对蔬菜产生毒害作用。下面是常用微肥在一般蔬菜上的安全用量:铁肥(硫酸亚铁)土 Trace elements of the growth and development of vegetables play a large number of elements can not be replaced by the role of a lack of trace elements, vegetables will show the corresponding symptoms of deficiency. However, the critical range of many trace elements from deficiency to overdose is very narrow, and if the amount of micronutrients used is too large or uneven, it tends to cause toxic effects on the vegetables. The following is the safe use of common trace fertilizers in general vegetables: iron fertilizer (ferrous sulfate) soil