This paper aims to yield and yield attributes characters of aus rice genotypes under different levels of water stress conditions. The ten rice genotypes were used as treatment, i.e. BR21, BR24, BRRI dhan42, BRRI dhan43, BRRI dhan48, BRRI dhan55 and lines BR6976-11-1, OM1490, BR6976-2B-15 and water stress tolerant variety Hashikalmi were treated with different durations of water deficiency such as continuously irrigated throughout the experimental period, normal irrigation up to 30 days and after that no irrigation for 7 days, then irrigated continuously and normal irrigation up to 30 days and after that no irrigation for 15 days and then irrigated continuously. Plants were grown in the rain-protected polyethylene shelter or shed to avoid rain under natural conditions in the earthen pots. The results of the experiment that the grain yield per plant recorded were the highest at control treatment and gradually decreased with increasing water stress duration in the genotypes. However, the grain yield was less affected due to water stress treatment in BRRI dhan55 and Hashikalmi compared to other genotypes. Decreased grain yield per plant under water stress conditions was due to a reduction of effective tillers, panicle number, filled grains, root-shoot and panicle dry matter content, etc. while less affected due to water stress treatment in BRRI dhan55 and Hashikalmi compared to other genotypes. BRRI dhan55 and Hashikalmi showed better performance in all days of water stress conditions. It was revealed that BRRI dhan55 and Hashikalmi produced the highest number of tillers, effective tillers and number of filled grains, number of spikelet per panicle and yield per plant. The grain sterility percentage was much higher in BR6976-2B-15 due to water stress treatment compared to other genotypes. Hashikalmi and BRRI dhan55 produced the highest number of tillers per plant.
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