Methane and Nitrous Oxide Emission from Louisiana Rice Fields under Three Water Management Practices

Kongchum Manoch, Harrell Dustin L, Barron Michael A, Adotey Nutifafa, Li Ji Feng
2020 Journal of Rice Research and Developments  
A two-year experiment was conducted in 2013 and 2014 to evaluate the effect of water management practices on methane (CH 4 ) and nitrous oxide (N 2 O) emission, and grain yield from Louisiana rice fields. Three water management practices, including delayed flooding (DF), straighthead (SH), and intermittent flooding (IF), were evaluated. Seasonal cumulative CH 4 emissions were lowest in IF treatment in both 2013 (125 kg CH 4 ha -1 ) and 2014 (271 kg CH 4 ha -1 ), followed by SH treatment 209,
more » ... H treatment 209, and 287 kg CH 4 ha -1 in 2013 and 2014, respectively. The highest CH 4 emission was observed in DF treatment for both years 239, and 295 kg CH 4 ha -1 in 2013 and 2014. Mean daily CH 4 emissions ranged from 1.49 to 2.84 kg CH 4 ha -1 d -1 in 2013 and 2.91 to 3.18 kg CH 4 ha -1 d -1 in 2014. CH 4 emissions of the IF treatment were reduced by 39% (2013) and 8% (2014) as compared to the DF treatment. Seasonal cumulative N 2 O emissions were 141 to 152 (g N 2 O ha -1 ) in 2013, and 161 to 177 (g N 2 O ha -1 ) in 2014. Mean daily N 2 O emissions ranged from 1.68 to 1.81 g N 2 O ha -1 d -1 in 2013, and 1.92 to 2.11 g N 2 O ha -1 d -1 in 2014. Mid-season field drying did not impact N 2 O emissions. The contribution of CH 4 to Global Warming Potential (GWP) was significantly higher than N 2 O. IF water management practice showed a potential to reduce methane emissions without significance yield loss compared to the DF water management practice. Citation: Kongchum M, Harrell DL, Barron MA, et al. (2020) Methane and Nitrous Oxide Emission from Louisiana Rice Fields under Three Water Management Practices. J Rice Res Dev 3(1):74-81 Kongchum et al. J Rice Res Dev 2020, 3(1):74-81 Open Access |
doi:10.36959/973/423 fatcat:b7qrloo3czgafajpctjoprngie