Where to buy urea: six things to settle before the order goes out
Anyone asking where to buy urea is usually not asking about the molecule. Urea is urea: CAS 57-13-6, 46% nitrogen, the highest-analysis solid fertilizer in commercial use, and a global commodity traded in millions of tonnes. What actually differs between suppliers is the grade that turns up, how it is packed, what paperwork rides with it, and whether it lands when the spreader is booked. Six checks settle all of that.
1. Confirm the analysis, not the label
Fertilizer-grade urea is 46% nitrogen minimum. Anything materially below that is either a different product or a bag that has taken up moisture in storage. Ask for the analysis on the batch you are being quoted, not the brochure figure, and ask what the moisture specification is. A maximum of 0.5% is normal. The PubChem record for urea carries the identifiers worth having on file if your quality system needs them.
2. Ask for the biuret figure
Biuret forms during manufacture and is toxic to plants above a certain concentration. Soil-applied urea at or below 1.0% biuret is a non-issue. Foliar spraying is different: on citrus, coffee and other sensitive crops you want a low-biuret grade at or below 0.3%, and you have to say so at enquiry stage because it is a separate product line. A supplier who cannot quote a biuret number is quoting from a price list rather than from stock.
3. Prilled or granular
Granular urea has a larger, harder particle. It flies further off a spinning disc, breaks down less in the hopper, and is what you want for wide-bout machine spreading. Prilled urea is smaller and more uniform, cheaper to make, and better suited to hand application, to blending, and to dissolving into solution. Put prills through a wide-bout spreader and the distribution pattern falls apart at the edges. This is the single most common mismatch between what was ordered and what the farm needed.
4. Match the packaging to your handling
Fifty-kilogram bags on shrink-wrapped pallets suit a farm with no loader and a manual filling routine. One-tonne bulk bags cut the handling time but need something that can lift them over the hopper. Loose bulk is cheapest per tonne and only makes sense with covered storage and a way to move it. Decide this from what is standing in your yard, then order to it, not the other way round.
5. Get the documentation named at quotation
A specification sheet and a safety data sheet should ship with every consignment as a matter of course. A certificate of analysis for the specific batch is normally issued on request, and so are import, customs and phytosanitary documents where the load crosses a border. Ask for all of it at quotation stage. Asking after delivery is how a load sits at a port while paperwork is chased.
6. Treat lead time as part of the price
Urea pricing moves with gas costs, freight and the northern-hemisphere application season, and availability tightens ahead of planting in every market at once. A quote that lands three weeks after you needed to spread is worth nothing however good the number is. Quote the season rather than the field, confirm the dispatch window in writing, and build a margin for the port and the weather.
A note on CAS 124-43-6
Searches for urea frequently land on CAS 124-43-6, and it is worth being clear that this is not fertilizer urea. 124-43-6 is urea hydrogen peroxide, also called carbamide peroxide, a solid adduct of urea and hydrogen peroxide used as a bleaching and disinfecting agent rather than a nitrogen source for crops. Fertilizer urea is CAS 57-13-6. If a specification you have been sent quotes 124-43-6, check which of the two your process actually needs before ordering, because the two are priced and handled nothing alike. GCS supplies both; say which one at enquiry.
Where to buy urea from GCS
GCS supplies urea 46% in granular and prilled grades, in 50kg bags, one-tonne bulk bags or loose in bulk, alongside the rest of the bulk fertilizer range: NPK compounds, DAP, MAP, CAN, ammonium nitrate and muriate of potash. Send the crop, the hectares and the delivery point, and the quotation comes back against a named grade with a dispatch window on it.
Common questions
Is urea for sale in small quantities?
Not from GCS. This is bulk supply for commercial agriculture and industry, starting at pallet quantities of 50kg bags and running to full loads. Garden-scale quantities are a retail product and a different supply chain entirely.
What is the CAS number for urea?
Fertilizer urea is CAS 57-13-6, formula CO(NH2)2, molecular weight 60.06 g/mol. CAS 124-43-6 is a different chemical: urea hydrogen peroxide, also called carbamide peroxide, which is a bleaching and disinfecting agent rather than a fertilizer.
How long can urea be stored before it goes off?
Indefinitely if it stays dry. Urea does not degrade on the shelf, but it is strongly hygroscopic: an opened or torn bag in humid air draws moisture and cakes solid, which is what turns spreadable product into a blocked hopper. Store sealed, off the floor and out of direct sun.
Why does urea sometimes underperform compared with CAN?
Almost always because of volatilisation. Urea left on the soil surface hydrolyses to ammonia and a share of the nitrogen goes to the air, with losses rising in warm, dry, windy weather and on high-pH soils. CAN delivers immediately available nitrate and loses far less from a surface application, which is why it often outperforms urea in exactly those conditions.
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