Application:1. A highly-concentrated fertilizer containing two nutrients, 50% K2O and 18% S; 2. An ideal potassium and sulfur fertilizer for the production of pollution-free fruits, vegetables, ornamental plants and special crops; 3. Easily soluble in water, and can provide fast and effective potassium and sulfur for crops; 4. A high-efficient potassium fertilizer that does not contain free acid and can be used as base fertilizer, flushing fertilizer, and foliar fertilizer; 5. A high-quality raw material for producing high-grade complex fertilizer and compound fertilizer. 6. Granular potassium sulfate is beneficial to mechanical cultivation, and can make plants absorb slowly. It is the ideal raw material for making bulk blending fertilizer.