Methane mitigation in flooded Louisiana rice fields |
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| Authors: | C W Lindau P K Bollich R D DeLaune A R Mosier K F Bronson |
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| Institution: | (1) Wetland Biogeochemistry Institute and Nuclear Science Center, Louisiana State University, 70803 Baton Rouge, LA, USA;(2) Rice Research Station, Louisiana Experiment Station, 70527 Crowley, LA, USA;(3) Agriculture Research Service, U.S. Department of Agriculture, 80522 Fort Collins, CO, USA |
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| Abstract: | Summary A field experiment was conducted to determine whether selected nitrification inhibitors (encapsulated calcium carbide and dicyandiamide) and SO
inf4
sup-2
-containing compounds (NH4)2SO4 and Na2SO4] had mitigating effects on CH4 emissions from flooded rice. Microplots were established within a rice bay drill-seeded with the Texmont rice cultivar and CH4 fluxes were measured over the main rice cropping season. Methane emissions over the 77-day sampling period were approximately 230, 240, 260, 290, 310, and 360 kg CH4 ha-1 from the calcium carbide, Na2SO4-rate II, Na2SO4-rate I, (NH4)2SO4, dicyandiamide, and urea (control) treatments, respectively. Reductions in CH4 evolution, compared to the control, ranged from 14 to 35%, depending on treatment. The selected inhibitors and SO
inf4
sup-2
-containing compounds appear to be effective in reducing the CH4 emitted from flooded rice fields. |
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| Keywords: | Methane emissions Flooded soil Greenhouse gas Wetland rice Mitigation |
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