An Improved Technique for Determining Nitrogen Release from Polymer Coating Urea in the Rice Land
Controlled-release fertilizer,especially polymer-coated urea (PCU),is more popular nowadays and holds a big potential agricultural market.Relative PCU products come out quickly.Although laboratory measurements of PCU N release characteristic are listed by most of the manufacturer,data from field condition,especially rich land with high moisture,are lack.Traditional weight method with a vacuum oven was usually used in evaluation of PCU N release.However the temperature and time were showed differently in different researches.An improved weight method was applied in this project: PCU particles in the mesh bags were washed with distilled water and removed to a plastic ziplock bag which was weight before.After then the bag is placed in a refrigerator at -80℃ for 2h,and then transferred to the lyophilizer for drying 24h.We compared this improved method with chemical analyses for Kingenta PCU (Shandong Kingenta Ecological Engineering Co.,Ltd.).Overall,regression analysis suggested the N release as determined by the improved method and spectrophotometry method was not significantly different over the growing season,which showed the improved weight method can be applied for determining PCU N release characteristics in rice land.
Polymer-coated urea (PCU) N release Weight method Improved weight method
Xin YANG Shao-Fu WU Liang-Huan WU
College of Environmental and Resource Sciences,Zhejiang University,Hangzhou,Zhejiang,310058 Agriculture Bureau of Shaoxing city,Shaoxing,Zhejiang,312099
国内会议
第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛
成都
英文
456-460
2013-10-01（万方平台首次上网日期，不代表论文的发表时间）