An Improved Technique for Determining Nitrogen Release from Polymer Coating Urea in the Rice Land

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• 作者：Xin YANGShao-Fu WULiang-Huan WU
• 会议时间：2013-10-01
• 关键词：Polymer-coated urea (PCU) ; N release ; Weight method ; Improved weight method
• 作者单位：Xin YANG,Liang-Huan WU(College of Environmental and Resource Sciences,Zhejiang University,Hangzhou,Zhejiang,310058)Shao-Fu WU(Agriculture Bureau of Shaoxing city,Shaoxing,Zhejiang,312099)
• 母体文献：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论文集
• 会议名称：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
• 会议地点：成都
• 主办单位：中国环境科学学会
• 语种：chi

摘要

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.