Abstract:
The research work was carried out at the Agronomy Field Laboratory of Patuakhali Science and
Technology University, Patuakhali during the Aman season (July to December, 2016) for optimizing
number of seedlings hil l ' of rice varieties grown under submerged condition. The experiment was laid out
in a randomized complete block design with three replications. Three levels of seedling numbers viz. 2
seedlings hin-',4 seedlings hillland 6 seedlings hill-' with three varieties viz, BRRI dhan41 ,BRRI dhan53
and BRRI dhan54 were considered in the study. The number of seedlings hilr' did not significantly
influence all the parameters. The highest grain yield (5.54 t ha"), straw yield (5.30 t ha-I), total tillers hil l'
, (9.06), effective tillers (8.98) and 1000 grain weight (23.29g)were obtained at 4 seedlings hilr'. The
lowest grain yield (5.43 t ha'), 1000 grain weight (23.15g), total tillers (8.36), effective tillers (8.33) and
plant height (132.11 em) were obtained from 2 seedlings hil"'. Variety showed significant differences for
plant height, total tillers hin-', effective tillers hill", grains panicle", sterile spikelets panicle" and 1000-
grain weight. BRRI dhan54 showed with the highest grain yield (5.75 t ha'), straw yield (5.301 ha'),
grains panicle' (150m, plant height (151.33cm) and higher harvest index (52.00%). BRRJ dhan41
produced lower grain yield (5.32 t ha-I), grains panicle" (131.5), total tillers (7.50), effective tillers (7.58)
and sterile spikelets panicle' ' (40.3 I ). The interaction of variety and number of seedlings hilr'had
significant effect on plant height, total tillers hilr', number of grain panicle", number of sterile spikelets
panicle" and 1000 grain weight. BRRJ dhan54 with 4 seedlings hill" gave highest yield (6.06t ha'). straw
yield (5.45t ha-'),1000 grain weight (23.34g), total tillers (10.50) and effective tillers (10.33).
