Spirfert is a granular fertilizer supplier for importers and distributors worldwide — compound (NPK) and straight references, in 25 kg, 50 kg or big bags, for soil application.
Compound NPK references aren't fixed formulas — each one is built from a nitrogen source, a potassium source, and an optional trace element package. The list below is representative of what we regularly supply; other combinations can be discussed on request.
This list is not exhaustive. Every formula above can also be supplied with or without trace elements, and coloured on request — and if the exact ratio you need isn't listed, tell us the formula you're looking for.
Bulk vessel, big bags (600 kg or 1,200 kg), or 25 kg / 50 kg bags — with or without pallets, on request.
Soil application by broadcast or banding, for field crops, orchards, vegetables and turf.
Not every NPK is made the same way. The formulas listed above are compound — the straight references below can also be bought individually for blending. Understanding the difference explains why the two aren't interchangeable.
Each granule is chemically formed to contain the full N-P-K ratio — every handful delivers the same analysis. No segregation during transport, handling or spreading, which matters most for wide-spread and aerial application.
Straight fertilizers physically mixed to approximate a target ratio. Faster to produce and more flexible for custom ratios, but only even if the granules are matched in size and density — otherwise the mix segregates in transit or in the spreader, giving uneven results in the field.
Tell us the analysis, packaging or granule size you need — we'll get back to you directly.
As your fertilizer supplier in Belgium, we simply need your country, your crops, and the products you're looking for. In return, we'll come back to you with the right references and full documentation.