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Chinese Journal of Applied Ecology ›› 2016, Vol. 27 ›› Issue (5): 1489-1495.doi: 10.13287/j.1001-9332.201605.029

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Effects of slow/controlled release urea on annual CH4 and N2O emissions in paddy field.

GUO Chen1, XU Zheng-wei1, WANG Bin2, REN Tao1, WAN Yun-fan2, ZOU Jia-long3, LU Jian-wei1, LI Xiao-kun1*   

  1. 1College of Resources and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Wuhan 430070, China;
    2Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment, Ministry of Agriculture, Beijing 100081, China;
    3Soil and Fertilizer Station of Jingzhou City, Jingzhou 434020, Hubei, China
  • Received:2015-10-21 Online:2016-05-18 Published:2016-05-18

Abstract: Present study examined the influence of different types of slow/controlled release urea on rice yield and annual greenhouse gas emissions in a paddy field, and assessed the greenhouse gas intensity (GHGI, equivalent to global warming potential GWP/rice yield). The results indicated that the optimized fertilization (OPT) treatment recorded the similar yield with reduced nitrogen fertilizer (21.4%) supply compared with the farmers’ fertilizer practice (FFP) treatment, and decreased the annual emissions of CH4 (12.6%) and N2O (12.5%) during the rice season, and N2O emission (33.3%) during the fallow period. Application of controlled release urea (CRU) reduced CH4 emission by 28.9% during the rice-growing season with respect to OPT treatment, and showed negligible CH4 emission during the fallow season. However, nitrification inhibitor (DMPP) treatment was found to reduce the CH4 emissions by 41.6% and 76.9%, and N2O emissions by 85.7% and 6.5%, during the rice growing season and fallow season, respectively, compared with OPT treatment. In the fallow season, the N2O emissions accounted for 76.8%-94.9% of annual N2O emissions, which was clearly a key point for evaluation of greenhouse gas emissions in paddy. The average values of GHGI in OPT, CRU and DMPP treatments were 0.50, 0.41 and 0.33 kg·kg-1, respectively. Considering the benefits of higher rice yield and lower annual greenhouse gas emissions, combined application of urea and nitrification inhibitor could be the best combination in paddy fields.