Hongsifangâ€, “Red Classic†easily-degradable polymer-coated sustained-release fertilizer is prepared by the manufacturing process of direct film formation of polymer in situ reaction. The coating thickness is only 16 microns, the initial dissolution rate is less than 5%, and the nutrient release period many adjusted between 30-180days. Also, the used coating material is bio degradable. Overall it reaches the international leading level.
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