Granular, Slow-Release Fertilizer from Urea-formaldehyde, Ammonium Polyphosphate, and Amorphous Silica Gel: A New

Yang Xiang1, Xudong Ru1, Jinguo Shi1

  • 1Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, School of Materials Science and Engineering , North University of China , Taiyuan 030051 , China.

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