PERFORMANCE OF FIVE SELECTED HYBRID RICE VARIETIES IN AMAN SEASON

Abstract

The experiment was conducted in the Research Farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, to observe the performance of five hybrid rice varieties namely Shakti 2, Suborna 8, Tia, Aloron and BRRI hybrid dhan 2 in Aman season. Inbred BRRI dhan 33 was used as a check variety. The experiment was laid out in Randomized Complete Block Design with three replications. The studied hybrid varieties exhibited superiority in respect of growth characters such as tillers hill-1, leaves hill-1, TMD hill-1, leaf area hill-1, LAI, CGR, RGR and NAR over the inbred BRRI dhan 33. At reproductive stage highest TMD hill-1 was found in hybrid variety Tia (84.0 g) and inbred variety BRRI dhan 33 produced the lowest TMD hill1 (70.10 g). Maximum leaf area hill-1 was found in Tia (1787cm2) and minimum leaf area hill-1 was found in BRRI dhan 33 (1198cm2).The average highest and the average lowest CGR and RGR were recorded in Tia (40.63 g m-2 d-1 and 17.9 mg g-1 d-1) and BRRI dhan 33 (27.26 g m-2 d-1 and 13.35 mg g-1 d-1). These hybrid varieties also showed higher yield attributes viz. effective tillers hill-1, 1000-grain weight, biological yield and harvest index (HI) over the inbred. Consequently, the test hybrid varieties provided the higher grain yield compared to the inbred. The highest number of effective tiller hill-1 was recorded in Tia (13.38) followed by Shakti 2 (11.67) and the lowest number was found in BRRI dhan 33 (7.05). The maximum number of filled grains panicle-1 was recorded in Tia (222.30) and the minimum number was observed in BRRI hybrid dhan 2 (159.90). Aloron showed the highest 1000 grain weight (29.95 g) and BRRI dhan 33 showed the lowest (25.56 g). Thus, highest grain yield was achieved from Tia (7.82 t ha-1), which was closely followed by Shakti 2 (7.65 t ha-1). These two varieties produced 24.0% higher yield over the inbred BRRI dhan 33. Effective tillers hill-1 and higher filled grains panicle-1 mainly contributed to the higher grain yield of hybrid varieties.