Zinc sulfate monohydrate powder, Guaranteed Analysis: Zinc(Zn) 35.5%, Water Soluble Zinc (Zn) 35.5%, Sulfur (S) 17%. Zinc sulfate powder can be applied as a foliar spray. Note: There is a potential for leaf burn or marking of fruit when applied as a foliar. Fall application is recommended on tree crops. Harmful if swallowed. Causes serious eye damage. Very toxic to aquatic life with long lasting effects.