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HSChapter 31
U.S. imports of superphosphates — other (nesoi) (HS 310319) totaled $42K in April 2026, traded with 5 countries.
Superphosphates — Other (NESOI) imports of $42K in April 2026 ran 19% above the year-to-date monthly average of $35K.
Last updated: April 2026 dataSuperphosphates with a phosphorus pentoxide content below 35% — principally single superphosphate (SSP) and ordinary superphosphate — are classified under 3103190000 as the residual superphosphate category. China and Mexico are the leading US suppliers, with Spain, Canada, and Egypt also contributing to import volumes. SSP's lower P₂O₅ concentration is offset by its sulfur content (from the sulfuric acid acidulation process), making it attractive for sulfur-deficient soils and as a cost-effective phosphate source in certain blended fertilizer formulations. Importers sourcing from China should verify whether any antidumping or countervailing duty orders apply to the specific product.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Importers should check with CBP and the International Trade Commission for any active antidumping or countervailing duty orders covering superphosphate or phosphate fertilizer products from China before placing orders. Trade-remedy coverage in the fertilizer sector has expanded in recent years, and a pre-import scope review can prevent unexpected duty liability.
SSP contains significant sulfur (typically 11–12%) as a co-nutrient from the sulfuric acid manufacturing process, making it a dual-nutrient product for sulfur-deficient soils. Its lower cost per ton compared with TSP also makes it attractive for bulk blending operations where the blend ratio can compensate for the lower P₂O₅ content.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3103190000 | SUPERPHOSPHATES OTHER | $42K | 25.01% | $843 |
SUPERPHOSPHATES OTHER
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3103190000 | SUPERPHOSPHATES OTHER | $709K |
SUPERPHOSPHATES OTHER
7.1K t
| State | Imports | Exports | Balance |
|---|---|---|---|
| Louisiana | -- | $709K | +$709K |
| North Dakota | $35K | -- | -$35K |
| Arizona | $7K | -- | -$7K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEW ORLEANS, LA | -- | $709K | +$709K |
| PEMBINA, ND | $35K | -- | -$35K |
| NOGALES, AZ | $7K | -- | -$7K |