Nitrogen use efficiency and ammonia volatilization from urea applied to wheat on a paddy field in Taihu Lake region

• Published in: Anhui nong ye da xue xue bao Vol. 36; no. 4
• Main Authors: Huang Jinbao, Yangzhou Vocational College of Environment and Resourse, Yangzhou(China), Ge Gaofei, Anhui Agricultural University, Hefei(China), Biotechnology Center, Fan Xiaohui, Chinese Academy of Sciences ,Nanjing(China), Institute of Soil Science
• Format: Journal Article
• Language: Chinese
• Published: 01.10.2009
• Subjects: AMMONIA; AMMONIAC; AMONIACO; BLE; EFFICACITE; EFFICIENCY; EFICACIA; http://www.fao.org/aos/agrovoc#c_2491; http://www.fao.org/aos/agrovoc#c_32705; http://www.fao.org/aos/agrovoc#c_349; http://www.fao.org/aos/agrovoc#c_8373; TRIGO; VOLATILISATION; VOLATILIZACION; VOLATILIZATION; WHEATS
• ISSN: 1672-352X

通过设定不同施肥等级,应用连续气流密闭室法研究不同等级施肥量时太湖地区典型稻麦轮作制度下的小麦基肥、返青肥和拔节肥施用尿素的氨挥发损失。结果表明,氨挥发率为1.51%-3.07%,3次施肥氨挥发率大小顺序为基肥＆gt;拔节肥＆gt;返青肥,氨挥发损失主要时期是在施肥后10-12 d内。随着氮肥用量的增加,不论是小麦氮素表观利用率还是生理利用率都是降低的;而产量在一定范围内是随着施氮量的增加而增加,当施肥量（N）为200 kg.hm-2时产量达最大值,施肥量（N）为250 kg.hm-2时产量开始下降。总体看处理间差异不显著,而处理与对照之间差异极显著（P〈0.01）。[著者文摘] Through setting up different amount of urea treatment, ammonia volatilization losses from urea applied during basal dressing, reviving-top dressing and jointing-top dressing stages were measured with the continuous airflow method in a wheat field in Taihu Lake region. The results showed that ammonia volatilization rates （percentage of the ammonia volatilization amount to the applied nitrogen fertilizer） were 1.51% -3.07%, the N losses in three top dressing periods were ranked as basal dressing 〉 jointing-top dressing 〉 reviving-top dressing, and ammonia volatilization mainly occurred in 10 -12 days after fertilization. With the increasing of the nitrogen rate,both the nitrogen apparent and physiological using efficiency