... suppliers,Website:http://www.lgagrofertilizer.com, and also a professional controlled release micronutrient company and factory, welcome to buy best and ... Sulfate, Boric acid and EDTALongevity: 3Months-12Months(Customized) Product Description Controlled Release Microelement, Supocote® B2O3 with high quality of Copper, Zinc, Boron ...