Which brand of potassium sulfate compound fertilizer is the best?

Red square. According to the inquiry of China Agricultural Network, Red Square Potassium Sulfate Compound Fertilizer is made of pure potassium sulfate, which is rich in products and complete in formula, suitable for all kinds of crops, commonly used in chlorine-free crops and economic fruit and vegetable crops, and deeply loved by the public. Zhongyan Anhui Hongsifang Co., Ltd. is a large-scale chemical enterprise jointly established by China National Salt Industry Corporation and Hefei Industrial Investment Holding Co., Ltd. The trademark of Hongsifang has been successively rated as a well-known trademark in China, the most valuable brand in China agricultural resources industry and the most popular trademark among consumers. Red Sifang brand series products are recommended by China after China's entry into WTO. Red Sifang brand compound fertilizer and Huangshan brand caustic soda are national inspection-free products.