Calcined Natural Phosphate Fertilizer
Calcined natural phosphate fertilizer is produced by heat-treating natural phosphates of heading 25.10 beyond simple impurity removal, which enhances its reactivity for agricultural use. This product falls under tariff item 3103.90.00 as it is a phosphatic fertilizer not elsewhere specified, and chapter note 3(a)(ii) explicitly includes calcined natural phosphates in heading 31.03.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the phosphate has been calcined or further heat-treated beyond simple impurity removal, as this is required for classification under this item
• Have documentation from the supplier confirming the heat-treatment process and the origin of the natural phosphates
• Verify that the product is not put up in forms or packages described in heading 31.05, which would change classification
Related Products under Tariff item 3103.90.00
Calcium Hydrogenorthophosphate Fertilizer
Calcium hydrogenorthophosphate fertilizer, also known as dicalcium phosphate, contains at least 0.2% fluorine by weight on a dry anhydrous basis, making it a recognized phosphatic fertilizer under chapter note 3(a)(iv). This product is used in agriculture to provide phosphorus to crops and falls under tariff item 3103.90.00 as a phosphatic fertilizer not elsewhere specified.
Rock Phosphate Heat-Treated Fertilizer
Rock phosphate that has been heat-treated beyond simple impurity removal, such as calcination, is a phosphatic fertilizer covered by chapter note 3(a)(ii). This product is used to supply phosphorus to agricultural soils and falls under tariff item 3103.90.00 as a phosphatic fertilizer not elsewhere specified.
Single Superphosphate Granules
Single superphosphate granules are produced by treating phosphate rock with sulfuric acid, resulting in a fertilizer containing 16-20% P2O5 and sulphur. This product is explicitly a superphosphate under chapter note 3(a)(iii) and falls under tariff item 3103.90.00 as a phosphatic fertilizer not elsewhere specified.
Triple Superphosphate Fertilizer
Triple superphosphate fertilizer is a concentrated phosphatic fertilizer containing about 46% P2O5, produced by reacting phosphate rock with phosphoric acid. It is a superphosphate under chapter note 3(a)(iii) and falls under tariff item 3103.90.00 as a phosphatic fertilizer not elsewhere specified.