College of Land and Environment, Shenyang Agricultural University, Northeast Key Open Laboratory of Soil and Environment, Ministry of Agriculture, State Engineering Laboratory of Efficient Use of Soil and Fertilizer Resources, Shenyang 110866, China
Abstract：Using outdoor exposure and cinnamon soil incubation test, by quality changes, infrared spectroscopy and electron microscopic scanning technology, to research the degradation ability of self-developed coated fertilizer films. The results of outdoor exposure and cinnamon soil incubation test showed that all films had certain degradation ability, and the degradation rate increased with the increase of time. Under two kinds of test conditions, the highest degradation rate could reach above 35%. The degradation ability of film citric acid/PVA was much stronger than epoxy resin/PVA. The degradation ability of citric acid/PVA/diatomite composite film materials was further enhanced because of the addition of diatomite. The epoxy resin/PVA composite film materials, although they had certain degradability, compared to the contrast, the difference was not significant, and adding diatomite can’t obviously increase the degradation rate. The results of IR spectroscopy showed that some major functional groups, such as CO，CC，CH would be reduced after degradation, and the transmission rate also increased, which showed that the degradation of composite film materials must be happened. Scanning electron microscopy showed that the surface becomes rough and uneven, and it also meant the films have some degradation. The results of IR spectroscopy and scanning electron microscopy were consistent with the results of quality change test, and could more objectively represent the degradability of film material. Modified film materials can effectively control nutrient release without causing harm to the soil environment, so it is suitable for the film materials of coated fertilizer.
[1] Yu Yang, Zou Hongtao, Wang Jian, et al. Plant Nutrition and Fertilizer Science, 2012，18(5)：1286. [2] Fan Zhiheng, Zhou Li, Ouyang Junjun, et al. Chinese Journal of Applied Chemistry, 2014, 31(1): 61. [3] Sui Changling, Zhang Min. Chinese Journal of Ecology, 2012，31(8)：2050. [4] Zhao Caixiao, He Wenqing, Liu Shuang, et al. Journal of Agro-Environment Science, 2011，30(8)：1616. [5] Wang Xinggang, Lü Shaoyu, Gao Chunmei, et al. Chemical Engineering Journal, 2014，252：404. [6] Cai Yanhua. Plastics Science and Technology, 2013，41(2)：75. [7] Ye Xinliang, Xie Baojun, Li Zhen, et al. Polymer Materials Science And Engineering, 2012，28(5)：27. [8] Kang Hu, Ao Lilong, Qin Lizhen, et al. Chinese Agricultural Science Bulletin, 2013，29(6)：54. [9] Chen Kang. Electronic Test, 2014，3：101. [10] Meng Xin, Xin Zhong, Cai Zhi. China Plastics, 2006, 20(6): 77. [11] Li Yanlei, Chen Fusheng, Liu Kunlun, et al. Plastics Science and Technology, 2012，40(11)：70.
