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U.S. imports of monoammonium phosphate (map) and mixtures (HS 310540) totaled $57.4M in July 2026, traded with 23 countries.
Importers of Monoammonium Phosphate (MAP) and Mixtures paid $80K in duties in July 2026 — an effective duty rate of 24% on $333K in dutiable value, based on actual customs collections rather than the published tariff schedule. Monoammonium Phosphate (MAP) and Mixtures imports of $57.4M in July 2026 ran 52% above the year-to-date monthly average of $37.8M.
Last updated: July 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.
157 shipments/mo
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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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3105400010 | Ammonium Dihydrogenorthophosphate (Map) | $57.3M | 0.14% | 0.58% | $80K |
| 3105400050 | Mixture W/Diammonium Hydrogenorthorphosphate,NESOI | $106K | 0.00% | 0.00% | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3105400000 | Ammonium Dihydrogenorthophosphate | $55.2M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Subheading 1 of 8 in heading 3105
Subheading 310540 · $57.4M of $75.9M
ImportsExports
Imports
$57.4MYoY · Pro
Exports
$55.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Saudi Arabia and Mexico together supply 90% of it.
customs district
destination
entry
rate provision · imports
96.1% enters free of duty; the effective duty rate is 0.14%.