... 2,No packing problem 3,Passed ISO9001-2001 kno3 potassium nitrate SpecificationFine GradeFirst GradeQualified GradeAgricultural grade(avoid caking)Purity99 ... compound fertilizer, foliar spray fertilizer, especially used for mango, tobacco, fruit tree, rubber. In additional, It is applied ... , Be careful not to inhale the powder of potassium nitrate to protect respiration apparatus.3.Handing and Storage ...