Vol. 16 No. 3
Influence of GA3 on hybrid rice seed production in West Bengal
Author(s): S. BISWAS, S. K. BORDOLUI AND P. CHATTOPADHYAY
Abstract: In hybrid rice, GA3 application has been found very effective in increasing seed set rate and seed yield. The experimental material comprising both the parental lines of hybrid KRH 2 i.e. CMS line-IR-58025A and restorer line KMR 3 treated with five doses of GA3 and control (water spray) were grown in randomized block design with three replications. The experiment was evaluated at the Teaching Farm, Monduri, B.C.K.V., Nadia, West Bengal. The aim of the present investigation is to identify a suitable dose of Gibberellic acid to enhance hybrid rice seed production under West Bengal situation. The influence of GA3 on panicle exertion, spikelet fertility and seed yield was significant as evident from the present investigation. Both the season, GA3 at the rate 200 ppm was found to maximize the spikelet fertility in CMS line which was ultimately effect on seed yield. Maximum seed yield (2.18 t ha-1) was recorded by the application of 200 ppm GA3 during kharif season. However, the highest seed yield (2.15 t ha-1) was noticed with the application GA3 @ 100 ppm during boro season.
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