A Complete Guide to Sulfur-Coated NPK Controlled-Release Fertilizer Production
What is Sulfur-Coated NPK Compound Fertilizer? Sulfur-coated NPK compound fertilizer refers to a slow-release fertilizer with a controlled-release structure formed by spraying a layer of molten sulfur onto the surface of NPK granular fertilizer and then covering it with a sealant. The sulfur layer acts as a physical barrier to delay nutrient dissolution, and the sulfate ions released after degradation also have the effects of sulfur fertilizer. This process extends the fertilizer effect period of ordinary NPK from 30 days to 60 to 90 days, and increases nutrient utilization by 20% to 35%, making it an ideal choice for single-application basal application to field crops such as rice and corn. Molten Spraying: The Core Process of Sulfur Film Formation
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