Sourcing calcium magnesium nitrate from China
Calcium magnesium nitrate fertiliser from China generally falls within a 6% duty line; related high-ammonium-nitrate formulations pay 6.50%. Confirm the composition and compliant nutrient labelling before ordering. Cambridge China Bridge sources calcium magnesium nitrate fertiliser.
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Duty depends on the actual nitrate formulation
Read from the UK Trade Tariff on 3 October 2026, heading 3102 covers mineral or chemical nitrogenous fertilisers. For calcium magnesium nitrate, check the residual line 3102 90 00 90 against the full composition. Its China duty is 6%. The table includes related calcium/ammonium nitrate formulations for comparison; these are not interchangeable descriptions of calcium magnesium nitrate.
The listed comparison lines range from 6% to 6.50%, with no anti-dumping or countervailing duty or suspension recorded. The solid-fertiliser lines containing over 80% ammonium nitrate carry an ammonium nitrate import control. For qualifying imports from China, arrange the detonation resistance test certificate, arrival within 60 days of testing, advance notification at least 5 days before arrival and certificate records for at least 2 years. Confirm applicability with your customs broker.
Confirm the commodity code using the ingredient breakdown, nutrient analysis and pack size. See the wider calcium nitrate fertiliser guide for related products. The example order is illustrative; use UK import duty and VAT to assess the shipment.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Other nitrogen fertilisers, including qualifying calcium magnesium nitrate | 3102 90 00 90 | 6% | None |
| Other solid nitrogen fertilisers containing over 80% ammonium nitrate | 3102 90 00 10 | 6.5% | None |
| Calcium nitrate and ammonium nitrate double salts or mixtures, other | 3102 60 00 90 | 6% | None |
| Calcium/ammonium nitrate double salts or mixtures, over 80% ammonium nitrate | 3102 60 00 10 | 6.5% | None |
Specify calcium, magnesium and nitrogen separately
Ask for the complete formulation, including any ammonium nitrate, and a batch certificate of analysis. Specify nitrate nitrogen, ammoniacal nitrogen where present, calcium and water-soluble magnesium. State whether calcium and magnesium results are expressed as elements or oxides. Agree moisture, particle size, insoluble residue and a dissolution test using your intended water and application concentration.
For Great Britain, confirm the applicable fertiliser labelling rules, including any type and nutrient declarations, with the relevant authority. Agree the label before printing. Check UK REACH registration coverage for each imported substance: the registration threshold is 1 tonne per substance each year, and an appointed representative may undertake importer duties. A safety data sheet is required where a hazardous chemical is supplied for workplace use.
Worked duty example
Illustrative example, not a quote: Illustrative order: 25 tonnes of bagged calcium magnesium nitrate fertiliser under 3102 90 00 90, invoiced at £9,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £11,500. Duty at 6% is £690. Import VAT at 20% is charged on the customs value plus duty, £12,190, so it is £2,438. Import taxes total £3,128; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £690 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Identity: match the formulation, batch analysis, invoice and bag label; investigate any substitution of calcium/ammonium nitrate for the agreed calcium magnesium nitrate.
Nutrients: independently sample the shipment and test nitrogen forms, calcium and water-soluble magnesium against the contract, using the same reporting basis.
Dissolution: test a representative sample for dissolution and insoluble residue under the agreed conditions; check caking, dust and particle consistency.
Packing and documents: inspect liners, seals, seams, moisture damage and batch identification; check applicable safety and ammonium nitrate documents before loading and inspect bags again on arrival.
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What goes wrong
A calcium result expressed as oxide can be mistaken for elemental calcium, while total magnesium can conceal a shortfall in the water-soluble fraction. A sample that dissolves in factory water may leave residue under the buyer’s conditions. Write the reporting basis and dissolution method into the order.
Moisture entry can leave bags caked or leaking, and a changed nitrate formulation can invalidate the agreed analysis and customs assessment. Compare arrival samples with retained shipment samples and isolate disputed batches. Use the quality inspection guide to brief the inspector.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.
Frequently asked questions
What is the UK import duty on calcium magnesium nitrate from China?
The candidate residual line 3102 90 00 90 carries 6%. Related high-ammonium-nitrate lines carry 6.50%. The supplied tariff facts record no trade remedy or suspension on these lines.
Is calcium magnesium nitrate the same as calcium ammonium nitrate?
Do not treat the names as interchangeable. Obtain the full formulation and separate calcium, magnesium, nitrate nitrogen and ammoniacal nitrogen results before agreeing the product or code.
Does calcium magnesium nitrate need a detonation resistance certificate?
Check the formulation. UK guidance requires a certificate for ammonium nitrate fertiliser imports with nitrogen content above 28% and consignments of 500kg or more. Ask your broker to confirm applicability.
What should I test before accepting the fertiliser?
Check nitrogen forms, calcium, water-soluble magnesium, moisture and insoluble residue against the contract. Test dissolution in the intended water and inspect bags for caking, leaks and batch identification.