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Nutrient Cycling in Agroecosystems

, Volume 64, Issue 1–2, pp 203–211 | Cite as

Urease and nitrification inhibitors to reduce emissions of CH4 and N2O in rice production

  • Xingkai Xu
  • Pascal Boeckx
  • Oswald Van Cleemput
  • Likai Zhou
Article

Abstract

Strategies used to reduce emissions of N2O and CH4 in rice production normally include irrigation management and fertilization. To date, little information has been published on the measures that can simultaneously reduce both emissions. Effects of application of a urease inhibitor, hydroquinone (HQ), and a nitrification inhibitor, dicyandiamide (DCD) together with urea (U) on N2O and CH4 emission from rice growing were studied in pot experiments. These fertilization treatments were carried out in the presence and absence of wheat straw, applied to the soil surface. Without wheat straw addition, in all treatments with inhibitor(s) the emission of N2O and CH4 was significantly reduced, as compared with the treatment whereby only urea was applied (control). Especially for the U+HQ+DCD treatment, the total emission of N2O and CH4 was about 1/3 and 1/2 of that in the control, respectively. In the presence of wheat straw, the total N2O emission from the U+HQ+DCD treatment was about 1/2 of that from the control. The total CH4 emission was less influenced. Wheat straw addition, however, induced a substantial increase in emissions of N2O and CH4. Hence, simultaneous application of organic materials with a high C/N ratio and N-fertilizer (e.g. urea) is not a suitable method to reduce the N2O and CH4 emission. Application of HQ+DCD together with urea seemed to improve the rice growth and to reduce both emissions. The NO3-N content of the rice plants and denitrification of (NO3+NO2)-N might contribute to the N2O emission from flooded rice fields.

methane nitrification inhibitor nitrous oxide rice urea urease inhibitor 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Xingkai Xu
    • 1
  • Pascal Boeckx
    • 2
  • Oswald Van Cleemput
    • 2
  • Likai Zhou
    • 3
  1. 1.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Laboratory of Applied Physical Chemistry, Faculty of Agricultural and Applied Biological SciencesGhent UniversityGentBelgium
  3. 3.Institute of Applied EcologyChinese Academy of SciencesShenyangChina

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