Abstract:
The experiment was conducted at the research farm of Sher-e-Bangla Agricultural
4'
University (SAU), Dhaka, during December 2010 to May 2011 with a view to
investigate the effect of date of transplanting on the growth and yield of hybrid rice
varieties in Boro season. The experiment included two hybrid and one inbred rice
varieties viz. Aloron, BRRI hybrid dhan2, and BRRI dhan45. and three transplanting
dates viz 30 December, 15 January and 31 January. The experiment was laid out in
Randomized Complete Block Design (RCBD) with four replications. The studied
hybrid rice varieties differed significantly from inbred BRRI dhan45 in respect of
growth, yield and yield contributing attributes. BRRI hybrid dhan2 produced the
maximum number of tillers hill' (16.42) at 70 days after transplanting (DAT) in 30
December followed by Aloron (12.96) at 70 days after transplanting in 30
December. At 90 DAT, the highest total dry matter (32.22 g plant1) was achieved
from BRRI hybrid dhan2 followed by Aloron (31.74 g planf 5, regardless of
transplanting date. BRRI hybrid dhan2 gave the highest grain yield (4.25 t hi'),
irrespective of transplanting dates. Among the threc transplanting dates, 30
December transplanting exhibited the highest grain yield (4.55 t hi'). The
significant highest grain yield (5.38 t hi') was found from the combination of BRRI
hybrid dhan2 and 30 December transplanting while the lowest (2.88 t hi') from
Aloron at 31 January transplanting. This higher grain yield was attributed by the
higher number of effective tillers hill" and filled grain panicle", and heavier
grain size of the BRRI hybrid dhan2. So, hybrid dhan2 is suitable for early Boro
season.
