Site position and tillage treatment effects on nitrous oxide emissions from furrow-irrigated rice on a silt-loam Alfisol in the Mid-south, USA

The development of drought-resistant hybrid rice (Oryza sativa) cultivars has allowed furrow-irrigated rice production systems to become an increasingly popular alternative to traditional flood-irrigation. However, potential environmental implications, such as greenhouse gas emissions, specifically nitrous oxide (N2O), have yet to be evaluated. This study evaluated the effects of site position (i.e., up-, mid-, and down-slope) and tillage treatment [i.e., conventional tillage (CT) and no-tillage (NT)] on N2O fluxes and season-long emissions from a furrow-irrigated rice field on a silt-loam soil (Typic Albaqualfs) in east-central Arkansas. Gas collection from closed-chambers occurred weekly over the 2018 and 2019 rice growing seasons. Nitrous oxide fluxes differed (P