Fertilizer efficiency of Maifan stone coated urea and its film-forming physical-chemical properties

The fertilizer efficiency of a newfashioned coated urea, coated with Maifan stone and organic agglomerant by means of the open and rotating coating-craft, and its film-forming physical-chemical properties were studied. Pot experiment results showed that Maifan stone coated urea significantly increased the biomass comparing to the control (single application of conventional urea) and the nitrogen utilization ratio increased by 13%KG-3/5(32%.) Analysis results on the coating layer structure of Maifan stone coated urea using FT-IR indicated that there was a big structure change. New radicals appeared and peek shape changed. The film structural characteristics were also observed using scanning electron microscope. Results indicated that there was a big difference on the structure of Maifan stone between before and after coating. Maifan stone existed as separate single particles before coating, but after coating, these single particles were closely arranged, moreover, they were piled on by liquid glues forming a film. These changes gave rise to a more compacted film structure, which resulted in a better controlled-release capability of Maifan stone coated urea. Maifan stone, as a coating material, was worthwhile to ulterior study due to its low price and good performance.