Potassic fertilizers are classified on the following basis:
a) Having K in the chloride form: Chloride form of K fertilizers are used extensively in all crops except where no chlorine is desired in the fertilizer. Potassium chloride is the most common and cheap fertilizer among potassic fertilizer. e.g. Muriate of potash (KCl) (58-60% K2O.
b) Having K in non-chloride form: Non chloride form of K fertilizers are in demand by cultivators growing special crops such as tobacco, potato and tomato to obtain better quality e.g. sulphate of potash (48% K2O).