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１．喷雾浓度 只有适当的喷雾浓度，才能收到最好效果。正确的喷施浓度为：硫酸锌为０．０２％～０．０５％溶液；硫酸亚铁为０．３％～０．８％溶液；硫酸铜为０．０１％～０．０２％溶液；硼砂或硼酸为０．２％～０．２５％溶液；硫酸镁为０．０２％～０．０５％溶液；硫酸
1. Spray concentration Only the appropriate spray concentration, in order to receive the best results. Correct spraying concentration: zinc sulfate is 0.02% ~ 0.05% solution; ferrous sulfate is 0.3% ~ 0.8% solution; copper sulfate is 0.01% ~ 0.02% solution; Borax or boric acid 0.2% ~ 0.25% solution; magnesium sulfate is 0.02% ~ 0.05% solution; sulfuric acid