新型包膜尿素抑制氮素挥发及其降解性研究

Study on nitrogen volatilization and degradation of organic-inorganic complex coated slow-release urea

为揭示新型包膜尿素对环境的影响,采用室内培养和室外田间小区相结合的研究方法,研究了有机无机复合物包膜尿素抑制氮素挥发及其在土壤中降解性。研究结果表明,氮素挥发主要以NH3为主,制备的两种新型包膜尿素BG、BF的NH3、NOX的挥发高峰期出现的时间延缓,NH3挥发率比未包膜尿素CK降低了54.8%、51.3%,NOx挥发率比CK降低了47.8%、41.8%;电镜图像分析表明,在辣椒整个生长期内,膜材料表面出现一些细微的孔隙;辣椒收获后在自然环境中继续暴露60d后膜材料表面产生裂缝和孔洞。研究结论为研发廉价、环境友好的包膜肥料提出新的思路。

In order to reveal the effect of new organic-inorganic complex coated slow-release urea on the environment,a laboratory culture experiment and a field plot were conducted respectively to study the nitrogen volatilization of new organic-inorganic complex coated slow-release urea and the degradation of membrane in soil.The result shows that the main volatilization of nitrogen is NH3.Volatilization peaks of NH3,NOX of BG and BF appear slow.The NH3 evaporation rate of BG and BF are 54.8% and 51.3% lower than that of CK while the NOX evaporation rate of BG and BF are 47.8% and 41.8% lower than that of CK.SEM image shows that some tiny holes presents on the surface of membrane material in the red pepper plant.After the red pepper harvest,the crack and holes presents after exposing for another 60 days in the natural environment.The results of this study provide a new way for developing coated slow-release urea with a low cost and environment friendly way.