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