... , the occupied space of the material is less and less and gradually compressed and reaches the max value of the formation pressure. Then ... , Russia red potassium, potassium nitrate, ammonium chloride, Ammonium Phosphate Monobasic, Diammonium phosphate(DAP), NPK compound fertilizer, import Russia Potassium Sulfate(SOP), ground phosphorite, NH4SO4 ...