K fertilisers

Potash fertilisers are applied directly in the form of a concentrate or within compound fertilisers (NPK). Potash fertilisers can be divided into low-concentrated and concentrated. Low-concentrated fertiliser contains up to 30% of potash. The most used fertilisers of this type are sylvinite, kainite and potassium-magnesium. However, due to poor performance and a number of constraints associated with complex chemical composition, they are less frequently used in agriculture than concentrated fertilisers containing up to 60% potash.
K< 30%
Weak concentrated:
  • sylvinite / KCl·NaCl
  • kainite / KCl·MgSO4·6H2O
  • potassium magnesia / K2SO4·MgSO4
Kup to 60%
  • potassium chloride / KCl
  • potassium sulphate / K2SO4
  • potassium carbonate / K2СO3
  • potassium electrolyte
  • 30%- and 40% potassium salts

The most popular
type of K fertiliser is potassium
chloride produced from sylvinite;
it belongs to the second group.
It is 95-98% or even 99% crystalline salt
of white or pink colour with a useful substance content of around 57-60%.

Potassium chloride is almost non-hygroscopic, non-caking, easily dispersed and highly soluble in water. In addition, it is suitable for all types of crops and soils.
Other types
of concentrate include potassium sulphate, potassium carbonate, potassium electrolyte, as
well as potash salts obtained by mixing potassium chloride and milled sylvinite (40% of potash)
or kainite (30% of potash).