Gibberellic acid (GA(3)) application after anthesis is an important practice in hybrid rice seed production, and it plays diverse roles in seed quality and seed yield. The main objective of this study was to determine (1) the effects of GA(3) application after anthesis on seed vigor and (2) the optimal GA(3) dosage applied to Indica hybrid rice seed production. Field experiments of different GA(3) dosages (15 g hm(-2) and 30 g hm(-2), respectively) after anthesis were conducted in 2016 and 2017, and seed vigor parameters, stigma vigor index, and seed yield were determined. We found that signif...
