K2O fertilizer means potash, the fertilizer that supplies potassium. Its price follows the world market for potassium chloride (MOP). The World Bank benchmark for granular MOP averaged $367.50 per tonne in September 2026, up from an average of $347.50 in 2025. Sulphate of potash (SOP) usually costs more, because it is chloride-free and carries sulphur.
“K2O” (often typed as “K20”) is simply how fertilizer labels express potassium. A bag of MOP marked 0-0-60 contains the equivalent of 60% K2O. Knowing that helps you compare prices properly: what you are really paying for is the potassium.
What does K2O mean?
K2O (potassium oxide) is the standard way the potassium content of a fertilizer is stated, even though fertilizers do not actually contain potassium oxide. MOP is about 60% K2O and SOP about 50% K2O. To convert, 1 kg of K2O equals about 0.83 kg of elemental potassium (K), and 1 kg of K equals about 1.2 kg of K2O.
Potash price trend
| Period | Potassium chloride (MOP), $ per tonne |
|---|---|
| 2023 average | 383.2 |
| 2024 average | 295.1 |
| 2025 average | 347.5 |
| April to June 2026 | 402.9 |
| July to September 2026 | 383.6 |
| September 2026 | 367.5 |
Potash has been steadier than nitrogen fertilizers in 2026. Urea spiked in the second quarter, while potash rose more gently and eased again in the third quarter.
MOP vs SOP: why the price differs
| MOP (muriate of potash) | SOP (sulphate of potash) | |
|---|---|---|
| K2O content | About 60% | About 50% |
| Extra nutrients | Chloride | Sulphur, no chloride |
| Price | Lower; the world benchmark | Usually at a premium to MOP |
| Best for | Most field crops | Chloride-sensitive crops: tobacco, some fruit and vegetables |
For a fair comparison, work out the cost per kilo of K2O: divide the price per tonne by the K2O content. Read more about MOP fertilizer and potash vs potassium.
What drives potash prices
- Supply: a few countries produce most of the world’s potash, led by Canada, Russia, Belarus and China. Sanctions, mine problems or export routes quickly affect the market.
- Demand: large importers such as Brazil, China, India, the US and Southeast Asia buy ahead of their planting seasons.
- Contracts: large annual contracts with China and India often set the tone for the year.
- Freight and currency: shipping costs and exchange rates change the landed price.
See what potash is and who produces it.
From world price to your price
The benchmark is only the starting point. Your landed cost adds:
- Freight and insurance to your port
- Port handling and import duties
- Bagging, if you buy bagged rather than bulk
- Inland transport and the distributor’s margin
Retail bag prices are therefore higher than bulk prices, and in some countries, such as India, retail potash prices are also shaped by government subsidy schemes. Always check with an authorised local dealer for farm-gate prices. Our guide to calculating import landed cost shows the method.
Tips for buyers
- Compare offers on the same basis: product, K2O content, granular or standard, packaging and delivery terms.
- Ask for a certificate of analysis and independent inspection.
- Buy ahead of the season when you can; prices often rise before planting.
- Check the supplier, especially when an offer is far below the market.
Buying potash in bulk
Agromer supplies potash and other fertilizers in bulk to importers and distributors. Send us the type (MOP or SOP), grade, quantity, packaging and destination, and we will check what we can offer. See our bulk fertilizer range.
Frequently asked questions
What is the price of K2O fertilizer in 2026?
The World Bank benchmark for granular potassium chloride (MOP) averaged $367.50 per tonne in September 2026. SOP usually costs more. Delivered and retail prices are higher.
What does K2O mean on a fertilizer bag?
It is potassium expressed as potassium oxide. MOP labelled 0-0-60 contains the equivalent of 60% K2O.
Why is SOP more expensive than MOP?
SOP is chloride-free, contains sulphur and is harder to produce, so it sells at a premium. It is used mainly on chloride-sensitive crops.
Why do potash prices change?
Supply from a few producing countries, sanctions, seasonal demand, big import contracts, freight and exchange rates all move the price.
Is K20 the same as K2O?
Yes. “K20” is a common typing of K2O, the oxide form used to express potassium content.