Kainit is a naturally occurring ore containing about:

• 11% K₂O water-soluble potassium oxide (9% K)
• 5% MgO water-soluble magnesium oxide (3% Mg)
• 29% Na₂O water-soluble sodium oxide (20% Na)
• 10% SO₃ water-soluble sulphur trioxide (4% S)
• Plus many other trace elements.

The Magnesium in Kainit is completely soluble and available at all pH's, unlike magnesium from oxide sources. This ensures, that it is readily available to the crop when it needs it. Kainit is also cleared for use as an organic fertiliser by many of the EU's organic food standards agencies.

Kainit for Sugar Beet

Magnesia-Kainit is used as a 'special' fertiliser for crops with a high sodium requirement such as sugar beet.

Kainit is most often used in the fertilisation of sugar beet, where it is commonly applied at 750 Kgs/ha in the autumn. It is also applied on grassland, where it is spread at 500 Kgs/ha in February and after each silage cut.
Our specialist grassland fertilisers for silage and grazing are based on at least 500Kgs/ha Kainit, which together with other raw materials, provide an optimum balance of nitrogen, phosphate, potash, magnesium, sulphur and sodium for maximum yield and exceptional animal nutrition.

Kainit on Grassland

Routine fertilisation of grassland with Magnesia-Kainit improves the health, productivity and fertility of grazing animals by enriching the forage with magnesium and sodium. The product consists entirely of naturally occurring crude potassium salt.

German research work on the use of Kainit fertilisers on grassland has proved a link to better cow fertility from cows fed Kainit-fertilised grass due to to a better balance of salts in their blood. The grass also tastes better to the cows resulting in higher dry matter intakes. Early use can also reduce the risk of grassland staggers owing to the soluble magnesium content.
See our Sugar Beet and Supergrass fertiliser pages for details of our fertilisers containing Kainit

• True Kainit cannot be compared with so-called Kainit-substitutes which do not benefit from soluble magnesium, sulphur and are liable to segregate upon spreading. Only Bunn can supply true Kainit
• At Bunn, we often top-up the Kainit with other raw materials, like Muriate of Potash or Triple Superphosphate in our Magsol fertiliser range. The resulting mix can supply all the nutrients for the sugar beet crop in a single application.

Note: Kainit should not be used on potatoes, where the sodium content will cause crop damage.

Organic Approved with prior permission

EC-Fertiliser: crude Potassium Salt with Sodium and Sulphur
EU-approved for use in organic farming and is approved for use in organic farming in accordance with European Commission Regulations EC 2092/91 and 1073/2000.

Product Safety