Zinc Sulfate Powder - Contains 35.5% Zinc & 16.5% Sulfur"Greenway Biotech Brand" 1 Pound 1 Pound of Greenway Biotech Organic Zinc Sulfate Monohydrate Powder -- It Contains 35.5% Zinc & 16.5% Sulfur -- 99.9% Pure--Repackaged from Organic Zinc and OMRI Listed Zinc Sulfate Great as Zinc Supplement for Plants and Lawns (especially Pecan Trees) Improves Zinc Deficiency in Plants Great to Make Organic Fungicide to Kill Unwanted Weeds Many Other Uses Such as Water Treatment, Moss Remediation, etc. Is 100% Water soluble Contains 35.5% zinc and 16.5% sulfur Is heavy metal free Will naturally improve the health of your pecan and other nut and fruit bearing trees