TILLERING BEHAVIOUR, GRAIN STERILITY AND YIELD OF HYV RICE VARIETIES AS INFLUENCED BY SEEDLING AGE

Abstract

The experiment was conducted at the research field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka from December, 2017 to April 2018 to study the tillering behavior, grain sterility and yield of HYV rice varieties as influenced by seedling age. The experiment comprised of two factors: Factor A: Rice variety (4 varieties) e.g., V 1 = BRRI hybrid dhan3, V 2 = Hera 4, V 3 = Moina, V 4 = BRRI dhan28 (inbred) and Factor B: Seedling age (3 levels) e.g., A 1 = Tansplanting of 25 days old seedlings; A 2 = Tansplanting of 35 days old seedlings and A 3 = Tansplanting of 45 days old seedlings. The two factors experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Data on different growth characters, yield components and yield were recorded. Statistically significant differences were observed for different treatments and their combined effect. Considering all the varieties and seedling age, the tallest plant (113.15 cm) was recorded from the combination of V 1 A 2 and the shortest plant (97.80 cm) was recorded from the V 4 . The maximum number of tillers hill -1 (17.07) was found from the combination of V 1 A 2 , whereas the minimum number (11.23) was observed from the combination of V 4 A 3 . The highest days to maturity (118.00) was recorded from the combination of V 3 A 1 , whereas the lowest (103.93 days) from V 2 . The maximum number of total tillers hill -1 (17.20) was recorded from the combination of V 1 A 1 , whereas the minimum number (10.87) from V 4 . The longest panicle (25.59 cm) was recorded from the combination of V 1 , whereas the shortest panicle (17.99 cm) from V 4 A 3 . The highest grain sterility (13.46%) was observed from the combination of V 4 A 3 , whereas the lowest (4.38%) was recorded from the combination of V 1 A 2 . The highest weight of 1000 grains (20.35 g) was recorded from the combination of V 1 A 2 , whereas the lowest weight (16.25 g) from V 3 A 3 . The highest grain yield (6.81 t ha -1 ) was recorded from the combination of V 1 A 2 , whereas the lowest grain yield (3.21 t ha ) from V 4 A 3 . The highest straw yield (7.75 t ha -1 ) was recorded from the combination of V 3 A 2 , whereas the lowest straw yield (4.92 t ha -1 ) was found from V 4 . From the above results it can be concluded that BRRI hybrid dhan3 provided best yield contributing characters and yield with 35 days old seedlings.

A 2 A 3 A 2 A 3 -1 A 1