Days to flowering were determined when 90% of the hills in each treatment had at least one tiller that reached anthesis. Days to maturity were determined when 95% of the spikelets within each treatment had turned yellow. The crop was harvested and sun dried, then total produce was weighed and recorded as total biomass. The produce was then threshed and grains were separated, dried (upto 14% moisture content) and weighed for grain yield. Nitrogen concentrations in leaves were determined before submergence and 0, 7 and 15 days of desubmergence by
Kjeldahl method