Abstract: The konjac fly powder/starch blends were prepared by casting the konjac flour/starch and PVA as the main raw materials. The effects of fly ash on the properties of the films were studied from the degradation and the release of nutrient. Results After adding fly powder and pure starch,the blending ratio of 0.6:1 blends was 0.96,st:1 blends were 0.57,the puncture force and tensile force increased,and the proportion of fly powder was higher. The effect of 0.6:1 blends was 70.538 N and 1 253.18 N respectively. The 28 days nitrogen slow release rate of pure starch film was 3.170% and of pure PVA membrane was 4.201% respectively. The nitrogen slow release rate range of different fly powder content membrane were from 17.704%~50.210%. The peak of 3 700~3 000 cm^-1 was narrowed at 2 910 cm^-1 And the interaction between fly powder and polyvinyl alcohol was enhanced. After scanning electron microscopy,it was observed that the surface of the blend film numbered 0:1 and st:1 was not Significant holes,0.2:1 and 0.4:1,have a small number of pores on the surface of the blend film,while the fly powder 0.6:1 has more pores on the surface of the blend film. And the emergence of mold point,indicating the degradation of the film. Conclusion Flying powder is beneficial to the sustained release of the film,and it also promotes the degradation.

Key words: konjac fly powder, blended film, release ability, degradability