EVALUATION OF MODERN AMAN RICE VARIETIES IN RELATION TO GROWTH AND YIELD ATTRIBUTES

Abstract

The experiment was carried out in rice (Oryza sativa L.) at Sher-e-Bangla Agricultural University (SAU) research farm, during July 2016 to November 2016 to evaluate the growth and yield performance of BRRI hybrid dhan 4 and five inbred (BRRI dhan 32, BRRI dhan 39, BRRI dhan 41, BRRI dhan 51 and BRRI dhan 66) rice varieties of Aman season. The experiment was arranged in randomized complete block design with four replications. Different physiological attributes like growth rate at different stage, morphological change, yield determining attributes and yield performance were studied of those test varieties. BRRI hybrid dhan 4 was showed better performance over the other selected inbred rice varieties in different growth parameters like tillers hill -1 , leaves hill -1 , TDM hill -1 , leaf area hill -1 , LAI, CGR and RGR. Again in case of yield related characters like effective tillers hill, panicle length, 1000-grain weight, Biological Yield (BY), Harvest Index (HI) were also higher in BRRI hybrid dhan 4. BRRI dhan 51 and BRRI dhan 66 occupied second and third position respectively compared to other three varieties based on growth and yield performance. BRRI dhan 66 had higher CGR (17.76 g m -2 d -1 ) and BRRI dhan 51 had higher RGR (1.86 mg g -1 d -1 ) than the other test varieties. The higher amount of dry matter accumulation at vegetative and reproductive stage was found in BRRI hybrid dhan 4 (84.65g) and second highest in BRRI dhan 66 (84.50 g). Total dry matter accumulations at vegetative and reproductive stages have positive relation with high grain yield. BRRI hybrid dhan 4 provided the highest grain yield (6.25t ha 1 1 ) closely followed by BRRI dhan 51 (6.08 t ha ). BRRI hybrid dhan 4 had the maximum tillers hill -1 ) and then BRRI dhan 41 (5.05 t ha -1 (18.30), panicle length (29.33 cm), grains panicle -1 (145.00), 1000-grain weight (30.83g), harvest index (41.89%). So that BRRI hybrid dhan 4 had produced around 20% higher yields over the inbred varieties BRRI dhan 32 and BRRI dhan 41.