Zinc Sulfate Powder 35.5% Monohydrate Plus 16.5% Sulfur"Greenway Biotech Brand" 25 Pounds 25 Pounds of Greenway Biotech Organic Zinc Sulfate Monohydrate 35.5% Zinc Plus 16.5% Sulfur "Greenway Biotech Brand" 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.