YIELD PERFORMANCE OF DIFFERENT AUS RICE VARIETIES UNDER IRRIGATED AND NON-IRRIGATED CONDITION

The experiment was conducted during the period from April to August, 2015 to find out yield performance of different Aus rice varieties under irrigated and non-irrigated condition. Twelve aus rice varieties BR-3, BR-14, BR-16, BRRI dhan27, BRRI dhan42, BRRI dhan48, BRRI dhan55, BRRI dhan65, China (Muladi local), Kali Shait-ta (Muladi local), Benamuri (Muladi local) and Abdul Hye (Jhalkathi local) were tested under two irrigation regimes: No irrigation (I₀) and Supplemental irrigation (I₁). Results showed that the maximum number of total and effective tillers hill^-1, maximum number of filled grains, unfilled grains and total grains panicle^-1 was recorded from supplemental irrigation condition. Higher grain yield (4.22 t ha^-1), straw yield (5.69 t ha^-1) and biological yield (9.91 t ha^-1) under irrigated as compared to that of the non-irrigated one (3.90 t ha^-1, 5.02 t ha^-1 and 8.92 t ha^-1). The highest harvest index was found from no irrigation (43.57%) and the lowest from supplemental irrigation (42.37%). Out of twelve, the local varieties yielded 27% lower (2.90-3.61 with an average of 3.26 t ha^-1) than the modern varieties (3.85-5.22, average 4.46 t ha^-1).