Effects of time of second nitrogen application on rice yield and yield components

O. Sariam and S. Surjit

Abstract

Second nitrogen application made from the time of panicle initiation to primary rachis branch differentiating stage [45-48 days after transplanting (DAT)] and from exine formation to early grain filling stage (66 81 DAT) significantly increased total spikelets per hill and percentage of filled grains, respectively. However. time of second nitrogen application had no significant effect on grain yield. although second nitrogen applied at panicle initiation stage( 4-5D AT) resulted in the highest rain yield. Total spikelets per hill was significantly and positively. correlated to yield (r:0.54). Multiple regression analysis indicated that total spikelets per hill together with percentage of filled grains accounted for 76% of the total variation in grain yield.

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