Double Superphosphate Granules (DSP)
Double superphosphate (DSP) granules are a phosphatic fertilizer produced by reacting phosphate rock with phosphoric acid, yielding 40-46% P2O5. Unlike single superphosphate, DSP contains no calcium sulfate, making it a concentrated source of phosphorus for agricultural use. It falls under tariff item 3103.19.00 as a superphosphate other than those specified elsewhere 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 |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is single superphosphate (SSP) rather than double
Single superphosphate is classified separately under heading 31.03.
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 DSP is not mixed with other fertilizers or additives that could shift classification to heading 31.05
• Verify the P2O5 content and provide a certificate of analysis to customs
• Check if the product requires registration under the Fertilizers Act with the Canadian Food Inspection Agency
Related Products under Tariff item 3103.19.00
Enriched Triple Superphosphate with Micronutrients
Enriched triple superphosphate (TSP) with micronutrients such as zinc and boron is a phosphatic fertilizer providing 44-46% P2O5. The added micronutrients are inorganic non-fertilizing substances, and the product remains a superphosphate under chapter note 3(c). It is classified under tariff item 3103.19.00 as other superphosphates.
Granular Triple Superphosphate 46% P2O5
Granular triple superphosphate (TSP) with 46% P2O5 is a high-analysis phosphatic fertilizer produced by reacting phosphate rock with phosphoric acid. The granules are sized 2-4mm for uniform application in agricultural settings. It is classified under tariff item 3103.19.00 as other superphosphates, provided it is not put up in forms described in heading 31.05.
High-Grade Double Superphosphate 42%
High-grade double superphosphate (DSP) with 42% P2O5 is a dense, granular phosphatic fertilizer suitable for pneumatic application in large-scale farming. It is produced by acidulating phosphate rock with phosphoric acid, resulting in a concentrated phosphorus source. This product falls under tariff item 3103.19.00 as other superphosphates.
Triple Superphosphate Fertilizer (TSP)
Triple superphosphate (TSP) is a concentrated phosphatic fertilizer containing 44-48% P2O5, made by reacting phosphate rock with phosphoric acid. It is widely used to correct phosphorus deficiencies in soils. Under tariff item 3103.19.00, it is classified as other superphosphates, provided it is not put up in retail forms.
Water-Soluble Triple Superphosphate Powder
Water-soluble triple superphosphate powder is a finely ground form of TSP with 44% P2O5, designed for fertigation and foliar application in greenhouses. It dissolves readily in water, providing a quick-release phosphorus source. This product is classified under tariff item 3103.19.00 as other superphosphates, as it is not put up in retail packages.