EFFECT OF APPLICATION AND FREQUENCY OF GIBBERELLIC ACID ON GROWTH AND YIELD OF CORIANDER (Coriandrum sativum L.)

Abstract

An experiment taking the variety BARI Dhonia-1 was carried out at the research field of Sher-e-Bangla Agricultural University, Dhaka during November 2016 to March 2017 to examine the effect of application and frequency of Gibberellic acid on growth and yield of coriander (Coriandrum sativum L.). The treatments consisted of five concentrations of GA3 viz. 0 (control), 25, 50, 75 and 100 ppm GA3 and two application frequencies viz. spray at 25 days after sowing (DAS) and spray at 50 DAS. There were ten treatments combination in all. The experiment was laid out in factorial Randomized Complete Block Design with three replications. The maximum plant height and leaves per plant were obtained from 100 ppm GA3 closely followed by 75 ppm GA3 while the highest primary and secondary branches per plant were recorded from 75 ppm GA3. Foliar spray of GA3 at 25 DAS produced the maximum plant height, leaves per plant, primary and secondary branches per plant. Days to first and 50% flowering and days to maturity were decreased with the increase of GA3 concentrations. Application of 75 ppm GA3 and GA3 sprayed at 25 DAS independently produced the highest values of primary and secondary branches per plant and yield contributing character. GA3 75 ppm eopled weak spray at 25 DAS gave the best results with regard to primary and secondary branches per plant (11.24 and 21.67), dry weight per plant (34.51g) umbels per plant (25.56), umbellates per umbel (6.24), seeds per umbel (33.90), seeds per plant (866.48), umbel circumference (22.52cm), seed yield (7.61g per plant and 2.03 t/ha) and stover yield (1.38 t/ha).