Potassium sulfate-based compound fertilizer is produced through ammonia potassium low-temperature conversion, chemical synthesis, and spray granulation processes, offering good stability. In addition to containing the three major nutrients N, P, and K essential for plants, it also includes trace elements such as S, Ca, Mg, Zn, Fe, and Cu. This fertilizer is suitable for various cash crops, particularly those sensitive to chlorine. The main components of potassium sulfate-based compound fertilizer include MAP (monosodium phosphate), DAP (diammonium phosphate), and ammonium sulfate (mainly obtained by neutralizing excess sulfuric acid and ammonia gas at low temperatures). It also contains potassium sulfate, urea, and some minor impurities such as calcium sulfate, iron, aluminum, and magnesium phosphates, as well as trace amounts of unreacted ammonium potassium.