You receive a container of urea labelled 46:0:0. But is it really 46 % nitrogen? Without proper quality verification, you have no way to know until a farmer complains about poor results — by which time your reputation and margins have already been damaged.
Request a Certificate of Analysis (COA) from the manufacturer for each production batch. The COA should show: nitrogen content (for urea), nitrogen and sulphur content (for ammonium sulfate), moisture content, biuret content (for urea), and particle size distribution.
Verify the COA by cross-referencing: the batch number on the COA should match the batch number on the bags. The chemical composition should fall within international standards (e.g., urea nitrogen 46.0-46.4 %, biuret max 1.0 %).
For orders above 50 tonnes, consider engaging a third-party inspection agency (SGS, Bureau Veritas, Intertek, or CCIC) to verify product quality before shipping. The inspector draws samples from the production batch, seals them, and sends them to an accredited laboratory.
Pre-shipment inspection typically costs 500-1,500 USD per shipment and takes 3-5 working days. It covers: chemical analysis, physical properties (particle size, moisture), visual inspection, weight verification, and packaging/labelling check.
Be cautious if a supplier: refuses to provide a COA, offers prices significantly below market, cannot name their raw material source, or resists third-party inspection. These are warning signs of adulteration or sub-standard product.
Product | Key Parameter | Standard Value | Acceptable Range |
Urea | Nitrogen content | 46.0 % | 46.0-46.4 % |
Urea | Biuret content | Max 1.0 % | 0.5-1.0 % |
Urea | Moisture | Max 0.5 % | 0.2-0.5 % |
Ammonium sulfate | Nitrogen | 21.0 % | 20.8-21.2 % |
Ammonium sulfate | Sulphur | 24.0 % | 23.5-24.5 % |
Ammonium sulfate | Moisture | Max 1.0 % | 0.3-1.0 % |
Verifying fertilizer quality starts with requesting a COA from the manufacturer and cross-referencing it with batch numbers and international standards. For larger orders, pre-shipment inspection by a third-party agency provides independent verification. The cost of inspection is minimal compared to the risk of importing sub-standard product.
Q: What is a Certificate of Analysis (COA)?
A: A COA is a document from the manufacturer showing the actual test results for a specific production batch. It confirms the product meets the agreed specifications for nutrient content, moisture, and other parameters.
Q: Should I test fertilizer after it arrives in East Africa?
A: For large orders or new suppliers, yes. Send samples to a local laboratory (such as the Government Chemist in Nairobi or SGS Tanzania) to verify the product matches the COA. This costs 50-150 USD per test.
Q: What happens if the fertilizer does not meet specifications?
A: If the product fails testing, contact the supplier immediately with the test results. A reputable supplier will offer replacement, credit, or refund. This is why pre-shipment inspection and clear contract terms are essential.
Maxing provides full COA documentation with every shipment. Contact ops@qdmaxing.com for quality assurance details and product specifications.
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