MORPHO- PHYSIOLOGICAL BEHAVIOUR AND YIELD OF HYBRID AND INBRED RICE VARIETIES IN BORO SEASON

Abstract

The experiment was carried out at the research farm of the Sher-e-Bangla Agricultural University (SAU), Dhaka-1207, during August 2013 to May 2014 to evaluate the morpho-physiological changes and yield performance of four hybrid (Heera-4, Aloron, BRRI hybrid-3 and Tia) and two inbred (BRRI dhan-29 and BRRI dhan-34) rice varieties. The experiment was set up in a randomized complete block design with four replications. Growth characters, yield and yield attributes were significantly different among the studied varieties. Hybrid (Heera-4, BRRI hybrid dhan-3) and inbred (BRRI dhan-29 and BRRI dhan-34) varieties exhibited superiority in respect of growth characters viz. tillers hill-1, leaves hill-1, TDM hill-1, leaf area hill-1, LAI, CGR, RGR over Aloron and Tia varieties. However, three hybrids (Heera-4, Aloron, and BRRI hybrid dhan-3) and inbred BRRI dhan-29 showed better performance in yield related characters viz, effective tillers hill-1, panicle length, 1000-grain weight, biological yield, harvest index (HI) over the rest two varieties. So, these three rice varieties (Heera-4, Aloron, and BRRI hybrid dhan-3) produced the higher grain yield compared to BRRI dhan-34 and Tia. Higher grain yield is related with higher dry matter production and partitioning of the afore-mentioned varieties. However, Heera-4 showed the best performance (8.24 t ha-1) closely followed by inbred BRRI dhan-29 (7.20 t ha-1) and then BRRI hybrid-3 (6.65 t ha-1). The hybrid varieties Heera-4 had maximum CGR, RGR particularly in the reproductive stage (90 DAT) possibly for high sink demand and thus, this variety produced around 34% higher yield over the inbred BRRI dhan-34 and Tia. Yield components, effective tillers hill-1 and 1000-grain weight mainly contributed to the higher grain yield. These results suggested that the hybrid rice variety, Heera-4 and inbred BRRI dhan-29 were the best among the test varieties.