Assessing Seasonal Methane and Nitrous Oxide Emissions from Furrow-Irrigated Rice with Cover Crops

Improved irrigation management is identified as a potential mitigation option for methane (CH4) emissions from rice (Oryza sativa). Furrow-irrigated (FR), an alternative method to grow rice, increasingly adopted in the Mid-South U.S. However, FR may provide risk yield performance and higher of nitrous oxide (N2O). This study quantified grain yields, CH4 N2O three different water practices rice: multiple-inlet (MIRI), FR, with cereal rye (Secale cereale) barley (Hordeum vulgare) preceding winter cover crops (FRCC). fluxes were measured May September 2019 using static chamber technique. Grain (11.8 Mg ha?1) MIRI (12.0 was similar, significantly than FRCC (8.5 ha?1). drastically reduced compared MIRI. Total seasonal decreased order 44 > 11 3 kg CH4-C ha?1 MIRI, FRCC, respectively. Cumulative low (0.1 N2O-N but (4.4 (3.0 there no net difference global warming among These results suggest that increased flux furrow-irrigated not greatly detract benefits furrow-irrigation offers producers.