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Nutrient Cycling in Agroecosystems

, Volume 97, Issue 1–3, pp 13–27 | Cite as

Methane (CH4) and nitrous oxide (N2O) emissions from the system of rice intensification (SRI) under a rain-fed lowland rice ecosystem in Cambodia

  • Proyuth Ly
  • Lars Stoumann Jensen
  • Thilde Bech Bruun
  • Andreas de Neergaard
Original Article

Abstract

The present field study investigated the effects of the system of rice intensification (SRI) on greenhouse gas emissions and rice yield, in the first field trial of its kind in Cambodia. The study was a 2 × 4 factorial design, including SRI and conventional management practices (CMP) with the following treatments: control, composted farmyard manure (FYM), mineral fertiliser (MF) and FYM + MF. The results indicated large seasonal variations of CH4 patterns during the growing season with a peak emission of about 1,300 mg CH4 m−2 day−1 under both production systems 2 weeks after rice transplanting. There was large temporal variability of CH4 fluxes from morning to midday. Emission of N2O was below the detection limit in both systems. Under each production system, the highest seasonal emission of CH4 was under the FYM + MF treatment, namely 282 kg ha−1 under CMP and 213 kg ha−1 under SRI. Total CH4 emission under SRI practices was reduced by 22 % in the FYM treatment, 17 % in the MF treatment and 24 % in the FYM + MF treatment compared to CMP. There was no effect of water management on CH4 emission in the non-fertilized treatment. Grain yields were not significantly affected by the production system. Thus the yield-scaled global warming potential (GWP) was lower under SRI than CMP, namely 21 % in FYM and FYM + MF treatments, and 8 % in MF treatment. The application of mineral fertilisers moderately increased CH4 emission but significantly increased rice yields, resulting in a significantly lower yield-scaled-GWP compared to farmyard manure.

Keywords

System of rice intensification Organic inputs Mineral fertiliser Water Methane Nitrous oxide 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Proyuth Ly
    • 1
  • Lars Stoumann Jensen
    • 1
  • Thilde Bech Bruun
    • 1
  • Andreas de Neergaard
    • 1
  1. 1.Department of Plant and Environmental Sciences, Faculty of ScienceUniversity of CopenhagenFrederiksberg CDenmark

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