SCREENING OF HYBRID RICE LINES FOR T. AMAN SEASON

Abstract

A field experiment was conducted in the farm area of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, during the period of July to November, 2014 to compare the growth and yield of hybrid rice lines for T. Aman season with a known inbred one. Eighteen hybrid rice lines and one inbred variety were used as planting materials for this experiment. The single factor experiment was laid out in a Randomized Complete Block Design with three replications. Data on different growth characters, yield contributing characters and yield were recorded. At 30, 45, 60, 75 DAT (days after transplanting) and at harvest, the tallest plant was recorded from BRRI dhan57 (37.38, 55.86, 78.15, 91.81 and 95.27 cm, respectively), whereas the shortest plant from hybrid line-4 (30.02, 41.73, 60.62, 71.76 and 75.10 cm, respectively) was detected among the materials under study. The maximum number of effective tillers hill -1 was recorded from hybrid line-14 (13.33), while that of the minimum was found in hybrid line-12 (10.00).The longest and the shortest panicles were recorded from hybrid line-14(25.89 cm) and hybrid line -12 (21.60 cm) respectively. The maximum number of filled grains panicle -1 was recorded from hybrid line-14 (92.00), while the minimum number was detected from hybrid line-12 (79.60). The highest weight of 1000-grains was found in hybrid line-11 (24.49 g), while the lowest weight was shown by the hybrid line-1 (20.06 g). The highest grain yield was found in hybrid line-14 (5.92 t ha -1 ) and that of the lowest in hybrid line-12 (4.19 t ha -1 ). The highest straw yield was found in hybrid line-6 (7.79 t ha ), whereas the lowest value was shown by the hybrid line-4 (6.55 t ha -1 ). Grain yield advantage over check was estimated and the highest positive advantage was recorded for the hybrid line-14 (6.28%) and the lowest positive advantage was observed in hybrid line7

(0.18%) whereas the highest negative advantage was found in hybrid line-12 (24.78%) and

the lowest negative advantage was observed in hybrid line-2 (-2.51%). Among the different hybrid rice lines, hybrid line-14 induced comparatively superior growth, yield contributing characters and yield compared to the other hybrid lines.