NPK high efficiency compound fertilizer Competitive price and high quality TRUE MANUFACTURE OF NPK AND AMMONIUM SULFATENPK high efficiency compound fertilizerThe NPK type has very much different formular , according to customer demand production., NPK FERTILIZERSActive IngredientN-P-KAppearance7%3-2-2-65 OMOrganic Matter:65%Black Columnar5-1-1-30 OMOrganic Matter:30%Black Columnar9%4-3-2-30 ...