Abstract
A field experiment was conducted to determine the effect local cultivars of Oryza sativa L. (rice) had on methane evolution from flooded plots. Semidwarf and tall varieties were drill-seeded into a Crowley silt loam (Typic Albaqualf) and methane fluxes were measured twice a week over the first and ratoon cropping seasons. Semidwarf varieties evolved significantly less methane over both growing seasons. Over the main cropping season, semidwarfs emitted an average 185 kg CH 4 ha −1 to the atmosphere compared with 300 kg CH 4 ha −1 for the tall varieties. During the ratoon sampling season, semidwarf and tall varieties evolved 540 and 830 kg CH 4 ha −1, respectively. Compared with tall cultivars, semidwarfs evolved 36% less methane over both seasons.
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