Abstract
Hybrid rice technology, now a reality in Bangladesh, aims to break the present yield ceiling of inbred rice to meet the future demand for rice in the country. Today, the major constraint to the expansion of this technology is hybrid rice seed production. With a view to increase per unit area production of hybrid seed, a field experiment was conducted at BRRI during the 2001 T. aman (wet season) and 2002 boro (dry season) to find out the effect of flag leaf clipping and gibberellic acid (GA3) application on hybrid rice seed yield. IR58025A (female parent) and BR827R (male parent) were taken as experimental materials. Four treatments were applied: T1 = control, T2 = GA3 application without flag leaf clipping, T3 = flag leaf clipping without GA3 application, and T4 = GA3 application with flag leaf clipping. The experiment was laid out in a randomized complete block design with three replications. Unit plot size was 21.5 m2.
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