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HSChapter 31
U.S. imports of monoammonium phosphate (map) and mixtures (HS 310540) totaled $22.4M in April 2026, traded with 19 countries.
Importers of Monoammonium Phosphate (MAP) and Mixtures paid $17K in duties in April 2026 — an effective duty rate of 25% on $69K in dutiable value, based on actual customs collections rather than the published tariff schedule. Monoammonium Phosphate (MAP) and Mixtures imports of $22.4M in April 2026 ran 13% below the year-to-date monthly average of $25.7M.
Last updated: April 2026 dataAmmonium dihydrogenorthophosphate — traded as monoammonium phosphate (MAP) — is a key nitrogen-phosphorus fertilizer used extensively in pre-plant and starter applications, and it enters the US under two distinct 10-digit lines: pure MAP (3105400010) and mixtures with diammonium phosphate (3105400050). Morocco is the leading supplier, a position underpinned by OCP Group's dominant global phosphate rock and fertilizer production capacity. Mexico and Saudi Arabia are secondary sources, giving the heading a geographically concentrated supply profile that importers should factor into procurement risk assessments.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The US tariff schedule specifically provides for MAP/DAP mixtures at 3105400050 within heading 310540. A product that is predominantly or purely DAP classifies under 310530, while a mixture of the two ammonium phosphate salts belongs under 3105400050. Importers should obtain a certificate of analysis confirming the ratio to support the correct classification.
MAP's lower pH makes it preferable for alkaline or calcareous soils where DAP's higher pH could reduce phosphate availability. It is also commonly used in fluid fertilizer blends and as a starter fertilizer for row crops. Understanding these agronomic distinctions helps importers anticipate seasonal demand patterns and plan procurement timing accordingly.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3105400010 | AMMONIUM DIHYDROGENORTHOPHOSPHATE (MAP) | $22.4M | 25.00% | $17K |
| 3105400050 | MIXTURE W/DIAMMONIUM HYDROGENORTHORPHOSPHATE,NESOI | $34K | -- | -- |
AMMONIUM DIHYDROGENORTHOPHOSPHATE (MAP)
MIXTURE W/DIAMMONIUM HYDROGENORTHORPHOSPHATE,NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3105400000 | AMMONIUM DIHYDROGENORTHOPHOSPHATE | $122.0M |
AMMONIUM DIHYDROGENORTHOPHOSPHATE
172.1K t
UREA, WHETHER OR NOT IN AQUEOUS SOLUTION
HS 310210
POTASSIUM CHLORIDE
HS 310420
MIXTURES OF UREA AND AMMONIUM NITRATE IN SOLUTION
HS 310280
AMMONIUM SULFATE
HS 310221
SUPERPHOSPHATES CONT 35% OR MORE P2O5
HS 310311
AMMONIUM NITRATE, WHETHER/NOT IN AQUEOUS SOLUTION
HS 310230
| Port | Imports | Exports | Balance |
|---|---|---|---|
| INTERNATIONAL FALLS-RANIER, MN | -- | $30.2M | +$30.2M |
| PEMBINA, ND | -- | $28.5M | +$28.5M |
| EASTPORT, ID | -- | $27.9M | +$27.9M |