TY - JOUR AU - Tin, Myo Thet AU - Chidthaisong, Amnat AU - Pumijumnong, Nathsuda AU - Arunrat, Noppol AU - Yuttitham, Monthira PY - 2022/09/06 Y2 - 2024/03/29 TI - Methane and Nitrous Oxide Emissions from Lowland Rice as Affected by Farmers’ Adopted Fertilizer Applications under Two Crop Establishment Methods in Myanmar: 10.32526/ennrj/20/202200095 JF - Environment and Natural Resources Journal JA - Environ. Nat. Resour. J. VL - 20 IS - 6 SE - Original Research Articles DO - UR - https://ph02.tci-thaijo.org/index.php/ennrj/article/view/247335 SP - 621-633 AB - <p>Identifying the optimal rice establishment option combined with specific fertilizer application can lower the global warming potential (GWP) and greenhouse gases intensity (GHGI) of rice production. In this study, methane (CH<sub>4</sub>) and nitric oxide (N<sub>2</sub>O) emissions and rice yields under different fertilizer application methods and two different planting methods, transplanted rice (TPR) and wet bed direct seeded rice (WDSR), was measured. Field experiments using a split plot design and closed chamber-GC method for gas flux measurements were conducted.&nbsp; CH<sub>4</sub> and N<sub>2</sub>O emissions ranged from 1.83-4.68 mg/m<sup>2</sup>/h and 0.073-0.135 mg/m<sup>2</sup>/h, respectively. Minimum CH<sub>4</sub> and N<sub>2</sub>O emissions were observed at 48-69 days after seedling (DAS) (tiller stage), while maximum emissions were generally found at 90 DAS or early primordial initiation (EPI) stage. It was found that TPR produced more CH<sub>4</sub> and N<sub>2</sub>O than WDSR across fertilizers methods almost each growth stage throughout the growing period. Regarding GHGs emission factors, CH<sub>4</sub> emissions were negatively correlated with soil pH (-0.35*, N=18). At higher soil pH, lower CH<sub>4</sub> emissions were found in early growth stages. The N<sub>2</sub>O emissions did not correlate with soil pH (-0.04 ns, N=18). The highest average CH<sub>4</sub> emission was reached in 90 days after seedling and EPI when the soil temperature was maximal at 34.8ºC. The correlation coefficient (r) between CH<sub>4</sub> emission and soil temperature was 0.48*, N=18, indicating a positive correlation.</p> ER -