2nd Edition of Agriculture, Forestry, and Horticulture World Conference 2026

Abstract

Alternate wetting and drying (AWD) for growing rice improves water productivity and minimize methane emission, but might be responsible for increased nitrous oxide emissions. The effects of water management on methane emission, nitrous oxide fluxes, emission factor (EF) and global warming potential (GWP) are not well documented, which has been evaluated during Boro seasons of 2023 at Gazipur and Kushtia region. Closed chamber techniques were used for determining emissions of greenhouse gases. Continuous standing water (CSW), AWD (15 cm threshold) and AWD (25 cm threshold) were imposed during the study period. The recommended chemical fertilizer rates were 138-10-80-5-5 kg ha-1 as N from urea, P from triple super phosphate, K from muriate of potash, S form gypsum and Zn from zinc sulphate for the both location. The experimental each plot size was 4 m x 5 m with four replication in a randomized block design. Thirty five day old (BRRI dhan92) seedlings was transplanted at 20 cm x 20 cm spacing during Boro season. In comparison with CF, the AWD (15 cm threshold) significantly reduced total GWP by 34-36% depending on location; but alleviated nitrous oxide fluxes by 8-13%. Depending on water management, the AWD reduced EF of CH4 (35-38%) but increased grain yield by 1-2% compared to CF system along with 35-37% reduction in GHG intensity (GHGI). There is no significant different of GWP, EF and GHGI among two AWD condition with both location. In conclusion, AWD (15 cm threshold) practice could be an effective strategy for reducing GHG emission, GWP, EF and GHGI without sacrificing rice yield. 
Keywords: GHG emission, GHG intensity, Emission factor, Boro rice, location