... system can has the action of compensation and protection. In the surface of the roller, the hole (arc trough ... roller, or peak to trough. Two rollers is arranged in horizon. The powder material on itself weight is compulsorily ... chloride, Ammonium Phosphate Monobasic, Diammonium phosphate(DAP), NPK compound fertilizer, import Russia Potassium Sulfate(SOP), ground phosphorite, NH4SO4, concentrated ...