OMRI-Listed Soluble Zinc & Sulfur in a Resealable 20 lb Pail

This zinc sulfate monohydrate fine powder delivers 35.5% zinc and 17.5% sulfur in a 100% water-soluble formula — packaged in a resealable hard plastic pail with screw-top lid for easy handling, precise dispensing, and moisture-free storage. OMRI listed and certified for use in organic agriculture, it's the go-to zinc source for growers correcting deficiencies across soil, foliar, and hydroponic programs.

Zinc drives growth hormone production, chlorophyll synthesis, carbohydrate metabolism, and cellular respiration. Deficiency shows up fast — stunted growth, interveinal chlorosis, and reduced yields. This fast-acting powder gets it back on track quickly.

Nutrient Analysis

• Zinc (Zn): 35.5% maximum
• Sulfur (S): 17.5%
• Lead (Pb): 0.01% maximum
• Iron (Fe): 1.0% maximum
• Cadmium (Cd): 0.01% maximum
• Chlorine (Cl): 1.0% maximum

Application Rates

• Foliar: 2–5 lb/acre
• Hydroponic stock solution: Dissolve 0.6 g per liter of water; apply at 1–10 mL/gallon of working solution to achieve 0.2–2.0 ppm zinc
• Constant-feed systems: Maintain 0.1–2.0 ppm zinc in nutrient solution
• Soil application: Broadcast or dissolve and drench to correct zinc-deficient soils

Key Features

• OMRI listed — certified for use in certified organic production
• 100% water soluble — fully dissolves for foliar, fertigation, and hydroponic use
• Fine powder — rapid dissolution with minimal agitation
• Resealable hard plastic pail — screw-top lid keeps contents dry between uses; stackable and easy to store
• 20 lb size — ideal for small-to-mid scale operations, trials, and growers who prefer smaller pack sizes

State restrictions: Not available for shipment to Oregon.