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Green Crystal Ferrous Sulphate Heptahydrate for Agricultural Fertilizer. Agricultural Efficiency: Corrects iron deficiency, improves soil structure, and promotes higher crop yields. OEM/ODM Support: Factory direct supply with customizable specifications and application grades. Global Certification: Certified by ISO, SGS, Interk, Reach, COA, and MSDS for international trade. Fast Delivery: Off-season lead time within 15 workdays; peak season within one month. Trusted Manufacturer: Professional enterprise with rich experience serving clients in over 50 countries.