M. Kumaresan, M. Rajaselvam, K. Nadhiya Devi and S.S. Vasanthkumar
Abstract
A field experiment was conducted to evaluate the effect of chemical regulators and bioregulators on growth, flowering and yield attributes of African marigold. The experiment was laid out in Randomized Block Design with three replication and 9 treatments. The treatment comprising of GA3 at 50, 100 and 150 ppm, NAA at 50, 100 and 150 ppm, Vermiwash 3% and Panchagavya 3%. Among the 9 treatments of chemical regulators and bioregulators, the GA3 100 ppm was the best for improving growth parameters viz., plant height (135.6 cm), plant spread (55.3 cm) and number of branches plant-1 (18.3). Flowering parameters viz., days taken to bud initiation (37.2), days to 50 % flowering (58.4) and flower diameter (6.9 cm). Yield parameters viz., number of flowers plant-1 (59.9), single flower weight (6.94 g), weight of flowers plant-1 (351.1 g) and estimated flower yield ha-1 (29249.8 kg) of African marigold.