Zinc Sulfate Powder 35.5% Monohydrate Plus 16.5% Sulfur"Greenway Biotech Brand" 10 Pounds 10 Pounds of 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. 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