Effects of water saving irrigation and rice variety on greenhouse gas emissions and water use efficiency in a paddy field fertilized with anaerobically digested pig slurry

摘要: Proper floodwater management during the cultivation period of paddy rice is essential for regulating trade-off between methane and nitrous oxide emissions, as well saving irrigation water resource maintaining crop productivity. To elucidate effects (WS) variety on different agro-environmental parameters such CH4 N2O global warming potential (GWP), greenhouse gases intensity (GHGI), carbon efficiency ratio, use (WUE), growth yield, a field experiment was conducted with two factors split-plot design consisting (1) main factor; WS (WS in which withdrawn at soil Eh < −150 mV kept 0–1 cm afterward) continuous flooding (CF), (2) sub-factor; forage Leaf Star (LS) normal Kinuhikari (KN). Results showed that significantly (P 0.05) mitigated emission by 65 % \( {\text{GWP}}_{{{\text{CH}}_{ 4} + {\text{N}}_{ 2} {\text{O}}}} \) 60 %, enhanced WUE 0.01) 180 from CF. Carbon grain aboveground biomass increased 2.4 2.5 times, respectively, GHGI reduced 3.1 times WS. No significant differences were observed plant height, tiller number, biomass, N uptake C accumulation treatments but varieties: LS higher values these than KN. This study highlighted an effective measure mitigating GWP, while sustaining