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有些微量元素虽对蔬菜生长发育起重要作用,但需要量却极少,蔬菜吸收稍多,就会发生毒害作用。因此,蔬莱上使用微肥必须慎重,绝对不可过量施用。常用微肥的安全用量是:①硫酸亚铁:土壤使用量每亩1～3.75公斤,叶面喷洒浓度0.2～1.0％。②硫酸锰、氧化锰:土壤施用量每亩1～2.25公斤,浸种浓度0.05～0.10％,叶面喷洒浓度0.05～0.10％。③硫酸锌:土壤施用量每亩0.25～2.50公斤,浸种浓度0.02～0.05％,叶面喷洒浓度0.1～0.5％。④硫酸铜:土壤施用量每亩1.5～2.0公斤,浸种浓度0.01～
Although some trace elements play an important role in the growth and development of vegetables, but the demand is minimal, slightly absorbed vegetables, poisoning occurs. Therefore, the use of fertilizer on vegetables must be careful, must not be overdose. The safe use of common fertilizer is: ① ferrous sulfate: soil usage per acre 1 ~ 3.75 kg, leaf spray concentration of 0.2 to 1.0%. ② manganese sulfate, manganese oxide: soil application rate of 1 ~ 2.25 kg per mu, soaking concentration of 0.05 to 0.10%, foliar spray concentration of 0.05 to 0.10%. ③ zinc sulfate: soil application rate of 0.25 to 2.50 kg per acre, seed soaking concentration of 0.02 to 0.05%, foliar spray concentration of 0.1 to 0.5%. ④ copper sulfate: soil application rate of 1.5 to 2.0 kg per acre, soaking concentration 0.01 ~