Summary
A field experiment was conducted to determine whether selected nitrification inhibitors (encapsulated calcium carbide and dicyandiamide) and SO sup-2inf4 -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 sup-2inf4 -containing compounds appear to be effective in reducing the CH4 emitted from flooded rice fields.
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Lindau, C.W., Bollich, P.K., DeLaune, R.D. et al. Methane mitigation in flooded Louisiana rice fields. Biol Fertil Soils 15, 174–178 (1993). https://doi.org/10.1007/BF00361607
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DOI: https://doi.org/10.1007/BF00361607