On December 26, the mainstream ex-factory price of 52% powdered potassium sulfate rose to 3,900–3,950 yuan per ton, marking an increase of 50–100 yuan per ton. This price surge was driven by significant increases in the prices of raw materials, potassium chloride and sulfuric acid, which substantially raised production costs for manufacturers, leading to a continuous upward trend in potassium sulfate prices.