Potash fertilizer commonly used in fruit production includes potassium sulfate, potassium chloride, cellar ash and plant ash.
Potassium sulfate, which contains active ingredients, is generally 50%-52%. It is a good potash fertilizer suitable for various fruit trees, and can be used as base fertilizer and topdressing.
The effective content of potassium chloride is generally 50-60%, which is a physiological acid fertilizer. It can be used as basal fertilizer, topdressing and root dressing. The coastal areas should be avoided and prohibited from using Fuji and Hongxing varieties which are susceptible to manganese damage (Apple rough skin disease).