EFFECT OF DATE OF TRANSPLANTING ON GROWTH AND YIELD OF HYBRID RICE IN BORO SEASON

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.