Abstract
Field experiment was conducted during the kharif seasons of 2011 and 2012 to evaluate the yield response of one hundred rice genotypes of the low land ecosystem under aerobic cultivation. On the basis of yield performance, ten best genotypes were selected and further evaluated for physiological traits under aerobic condition. Significant yield decline was observed in almost all the rice genotypes grown under aerobic condition in comparison to flooded condition. The yield differences between aerobic and flooded rice ranged between 18 and 73 %. Rice genotypes, IR 83867-B-B-250-3-1-1, IR 84887-B-155-40-1-1, IR 83920-B-B-277-2-1-1-1 and IR 83929-B-B-291-3-1-1 showed higher photosynthetic rate, stomatal conductance as well as chlorophyll content in comparison to national and regional check varieties. Promising genotypes under aerobic condition have higher grain yield, harvest index and low spikelet sterility. Study suggested that genotypes for cultivation under aerobic ecosystem can be selected on the basis of physiological traits.
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