HS code · 6-digit subheading
HS Code 3103.90 – Fertilizers, mineral or chemical; phosphatic, n.e.c. in heading no. 3103
HS code 3103.90 is the 6-digit subheading for fertilizers, mineral or chemical, phosphatic, n.e.c. in heading no. 3103. It is used for fused calcium-magnesium phosphate, basic slag, defluorinated phosphate, rock phosphate (treated for fertilizer use) and calcined phosphate..
What HS 3103.90 covers
HS code 310390 is a residual category for 'other' phosphatic mineral or chemical fertilizers not elsewhere specified in heading 3103. This includes a variety of specialized phosphorus-containing fertilizers that don't fall under superphosphates. Examples might be fused calcium-magnesium phosphates, basic slag (Thomas slag), or other unique phosphate compounds designed for specific soil conditions or crop requirements. These products often cater to niche markets or provide additional benefits beyond just phosphorus, such as liming effects or micronutrient delivery. International trade involves specialized chemical manufacturers and distributors, exporting to countries with particular agricultural needs or advanced farming practices. Importers range from developed agricultural markets to regions with specific soil deficiencies. Key trade considerations include precise chemical composition, solubility, efficacy claims, and adherence to agricultural input regulations, especially regarding heavy metal content.
- Covers
- Fused calcium-magnesium phosphate
- Basic slag
- Defluorinated phosphate
- Rock phosphate (treated for fertilizer use)
- Calcined phosphate.
- Examples
- Thomas slag (various producers)
- Fused Magnesium Phosphate (FMP)
- various treated rock phosphate products.
Codes often confused with 3103.90
Common mistake. This 'other' category is susceptible to misclassification with superphosphates (310311, 310319) if the product is not a true superphosphate, or with multi-nutrient fertilizers (3105) if other nutrients are significant, requiring careful analysis of the primary phosphatic component.
Top exporters and importers of HS code 310390, 2025
In 2025, the largest exporter of HS code 310390 in UN Comtrade data was Russia, with about 28% of world exports; the largest importer in UN Comtrade data was Indonesia, with 32% of world imports. Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 77% of its exports here ($16M, CEPII BACI), so it may also belong among the top exporters.
Top exporters 2025 · share of world exports
- 1 Russia* ~$72M 28% of world exports · partner records ↗
- 2 Egypt $66M 26% of world exports
- 3 Spain $22M 8.4% of world exports
Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 77% of its exports here ($16M, CEPII BACI), so it may also belong among the top exporters.
World total: $257M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Indonesia $179M 32% of world imports
- 2 Brazil $150M 27% of world imports
- 3 United States $84M 15% of world imports
World total: $551M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for 3103.90 3
Brazil splits HS 3103.90 into 3 NCM codes, Mercosur's 8-digit tariff lines.
- 3103.90.1 Calcium hydrogenorthophosphateHidrogeno-ortofosfato de cálcio Group
- 3103.90.11 Calcium hydrogenorthophosphate, 46% P2O5 or lessQue contenha, em peso, 46 % ou menos de pentóxido de difósforo (P2O5)
- 3103.90.19 Calcium hydrogenorthophosphate, over 46% P2O5Outros
- 3103.90.90 Other phosphatic fertilizersOutros
All Brazil NCM codes in heading 31.03 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 3103.90
What is HS code 310390?
HS code 310390 is a 6-digit subheading in the Harmonized System that covers: Fertilizers, mineral or chemical; phosphatic, n.e.c. in heading no. 3103. HS code 310390 is a residual category for 'other' phosphatic mineral or chemical fertilizers not elsewhere specified in heading 3103. This includes a variety of specialized phosphorus-containing fertilizers that don't fall under superphosphates. Examples might be fused calcium-magnesium phosphates, basic slag (Thomas slag), or other unique phosphate compounds designed for specific soil conditions or crop requirements. These products often cater to niche markets or provide additional benefits beyond just phosphorus, such as liming effects or micronutrient delivery. International trade involves specialized chemical manufacturers and distributors, exporting to countries with particular agricultural needs or advanced farming practices. Importers range from developed agricultural markets to regions with specific soil deficiencies. Key trade considerations include precise chemical composition, solubility, efficacy claims, and adherence to agricultural input regulations, especially regarding heavy metal content.
What products fall under HS code 310390?
Fused calcium-magnesium phosphate, basic slag, defluorinated phosphate, rock phosphate (treated for fertilizer use), calcined phosphate.
What are common misclassifications for HS code 310390?
This 'other' category is susceptible to misclassification with superphosphates (310311, 310319) if the product is not a true superphosphate, or with multi-nutrient fertilizers (3105) if other nutrients are significant, requiring careful analysis of the primary phosphatic component.
Which countries are the top exporters of goods under HS code 310390?
In 2025, the top exporters of HS code 310390 in UN Comtrade data were Russia (about $72M, 28% of world exports), Egypt ($66M) and Spain ($22M). World exports came to about $257M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 77% of its exports here ($16M, CEPII BACI), so it may also belong among the top exporters.
Which countries are the top importers of goods under HS code 310390?
In 2025, the top importers of HS code 310390 in UN Comtrade data were Indonesia ($179M, 32% of world imports), Brazil ($150M) and the United States ($84M). World imports came to about $551M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 310390 structured?
HS code 310390 is a 6-digit subheading under the Harmonized System. The first 2 digits (31) identify the chapter, digits 3-4 (03) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 310390?
Brazil splits HS code 310390 into 3 NCM codes: 3103.90.11 (Calcium hydrogenorthophosphate, 46% P2O5 or less), 3103.90.19 (Calcium hydrogenorthophosphate, over 46% P2O5), 3103.90.90 (Other phosphatic fertilizers). The first 6 digits of each match the HS code.