Five potassium products at five different strengths, each bringing a different second element with it. The potassium figure alone will not tell you which to buy.
The short answer. On our published grades: potassium chloride (MOP) is the strongest at 60% K2O, potassium sulphate (SOP) is 50% K2O, 18% S, potassium nitrate is 13% N, 46% K2O, potassium magnesium sulphate is 22% K2O, 11% Mg, 22% S and potassium schoenite is 19% K2O, 6% Mg. The strongest is not automatically the right one, because each brings something different alongside the potassium.
MOP is the most concentrated source on this list, and the cheapest per unit of potassium in most markets. The potassium arrives with chloride. SOP brings sulphur instead. Potassium nitrate brings nitrogen. The two magnesium-bearing salts bring magnesium and, in one case, a substantial sulphur figure as well.
So the decision is rarely about potassium strength. It is about whether the accompanying element is wanted, tolerated, or a problem in your particular application — and that is a question about your process, not about the salt.
| Product | Formula | Grade published | Standard packing |
|---|---|---|---|
| Potassium Chloride | KCl | 60% K2O | 50 kg net, HDPE bag |
| Potassium Sulphate | K₂SO₄ | 50% K2O, 18% S | 50 kg net, HDPE bag |
| Potassium Nitrate | KNO₃ | 13% N, 46% K2O | 50 kg net, HDPE bag |
| Potassium Magnesium Sulphate | K₂SO₄·2MgSO₄ | 22% K2O, 11% Mg, 22% S | 50 kg net, HDPE bag |
| Potassium Schoenite | K₂SO₄·MgSO₄·6H₂O | 19% K2O, 6% Mg | 50 kg net, HDPE bag |
Every grade in this table is the figure published on that product’s own page on this site. Nothing is estimated. The guaranteed analysis on the product page and the batch certificate of analysis govern any supply.
These two are close relatives and are frequently confused, so it is worth setting the published figures side by side: potassium magnesium sulphate at 22% K2O, 11% Mg and 22% S, and potassium schoenite at 19% K2O and 6% Mg. They are not interchangeable, and a purchase order that names one when it means the other will be filled as written. If you are not certain which your specification calls for, send us the specification and we will tell you.
'All five are manufactured by Taskon Industries and each has a full specification, physical properties and safety summary on its own page.
Where two products carry the same element at different strengths, the price per kilogram of bag is not a comparison. Divide the delivered price per kilogram by the element fraction and you get the cost per kilogram of the thing you are actually buying. That is the only basis on which grades of different strength can be set against each other.
Our nutrient cost comparison calculator does that arithmetic on any two products in our range and prints its working, and the element content calculator converts between kilograms of product and kilograms of the element. Freight follows the same logic: moving a weaker grade means paying to move more material that is not the element.
That is decided by your process, and by things we cannot see from here: how the product is applied, what it is blended with, what has to dissolve and how fast, the specification you or your customer must meet, and how far the material travels. Any supplier who answers that question without asking about your process is guessing.
We manufacture the alternatives set out above, so we have no reason to steer you toward the dearer one. Describe the application and we will tell you what we would send and why, including when the cheaper grade is the right answer.
Four things let us price these products without a round of questions: the grade, the quantity, the delivery location, and any specification you have to meet. Send those and we come back with a price, the packing, and the documents that travel with the consignment. There is more detail on what to send us for a quote.
Need a price rather than a figure to plan with? Tell us the quantity and where it is going.
Send the grade, the quantity and the delivery location and we will quote against them.