SOURCE-SINK RELATIONSHIP AND YIELD PERFORMANCE OF HYBRID RICE VARIETIES IN BORO SEASON

Abstract

The experiment was conducted in the Research Farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, to study the source-sink relationship and its impact on the yield performance of hybrid rice varieties in Boro season. The experiment was laid out in Randomized Complete Block Design with three replications. Five hybrid (BRRI hybrid dhan3, Heera 4, Sonarbangla 3, Moyna, Jagoron) and two inbred rice varieties (BRRI dhan28 and BRRI dhan45) were used as test crop. The studied varieties exhibited variation in plant height, tillers hill-1, leaf area index, total dry matter hill-1, shoot dry matter at pre-anthesis and maturity period, changes in shoot dry matter, shoot reserve translocation, total spikelets panicle-1, spikelets fertility, weight of 1000 grains, biological yield and harvest index. All the studied hybrid varieties exhibited superiority in respect of growth characters, yield and yield attributes over the inbred varieties. Highest shoot reserve translocation (15.58%) was observed in Heera 4, while the lowest value (9.59%) was found in BRRI dhan28. At heading Heera 4 maintained highest ratio of spikelets no. to LA (0.31 cm-2) and yield sink to LA (14.09 mg cm-2), while the lowest ratio of spikelets no. to LA (0.22 cm-2) and yield sink to LA (11.09 mg cm-2) were observed in BRRI dhan28. Heera 4 (83.19%) accumulated significantly highest percentage of dry matter from current photosynthate in grain, while BRRI dhan45 showed the lowest value (75.79%). Heera 4 provided the highest grain yield (7.80 t ha-1) which was closely followed by Jagoron (7.08 t ha-1). While BRRI dhan28 showed the lowest grain yield (4.23 t ha-1) closely followed by BRRI dhan45 (4.55 t ha-1). These results suggested that Heera 4 had the superiority over the test varieties in respect of post heading photosynthetic assimilation per unit leaf area and grain yield.