Granular Ammonium Sulfate 21-0-0 Fertilizer
Granular ammonium sulfate fertilizer with 21% nitrogen and 24% sulfur content, used primarily for correcting sulfur deficiencies in crops like corn and wheat. It falls under HTS 3102.21.00.00 as pure ammonium sulfate not put up in retail packages of heading 3105. The prilled form allows for even spreading and slow-release nitrogen supply to plants.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If mixed with ammonium nitrate as double salts
Double salts or mixtures of ammonium sulfate and ammonium nitrate fall under 3102.80 per chapter notes.
If put up in retail packages under 10kg
Ammonium sulfate in consumer retail forms or packages is classified under heading 3105, not 3102.
If urea-based rather than sulfate
Urea fertilizers are separately classified under 3102.10, distinct from ammonium sulfate in 3102.21.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify purity meets chapter note requirements for ammonium sulfate without organic additives exceeding trace levels
• Provide lab analysis certificates confirming N-P-K content (21-0-0) and sulfur percentage for customs valuation
• Ensure bulk packaging avoids retail forms under 3105 to prevent reclassification; declare net weight accurately
Related Products under HTS 3102.21.00.00
Prilled Ammonium Sulfate Industrial Grade
Prilled ammonium sulfate used in industrial agriculture for alkaline soil correction and as a nitrogen source in turf management. Classified under HTS 3102.21.00.00 as it qualifies as pure ammonium sulfate per heading 3102 notes (a)(iv). Its small prill size ensures uniform application in large-scale farming.
Bulk Ammonium Sulfate for Cotton Crops
Bulk ammonium sulfate specifically formulated for cotton farming to supply nitrogen and sulfur during vegetative growth stages. It meets HTS 3102.21.00.00 criteria as ammonium sulfate without retail packaging or prohibited mixtures. Helps lower soil pH while providing essential nutrients.
Standard Ammonium Sulfate 21% Nitrogen
Standard crystalline ammonium sulfate providing 21% nitrogen for general field crops like soybeans and rice. Falls squarely under HTS 3102.21.00.00 as described in chapter note 2(a)(iv) for pure ammonium sulfate. Widely used for its acidifying effect on alkaline soils.
Water-Soluble Ammonium Sulfate Fertilizer
Highly water-soluble ammonium sulfate for fertigation systems in greenhouse vegetable production. Classified under HTS 3102.21.00.00 meeting purity standards for ammonium sulfate without additives. Enables precise nutrient delivery through drip irrigation.
Agricultural Grade Ammonium Sulfate Pellets
Pelletized agricultural grade ammonium sulfate for easy handling in mechanical spreaders on golf courses and lawns. HTS 3102.21.00.00 applies as pure ammonium sulfate per note 2(a)(iv), not retail packaged. Provides dual nitrogen and sulfur nutrition.