Vol. 12, Issue 6 (2023)

Author(s):
Deepak Kumar SI and Sailendri Kumari Patra

Abstract:
An experiment was conducted by using plant growth regulators, that is, GA3 and NAA, from December 2020 to April 2021 under the Odisha plains at the Agricultural Research Station, Institute of Agricultural Sciences, Siksha "O" Anusandhan (Deemed to be) University, Bhubaneswar, to find out the optimum concentration of GA3 and NAA for better growth and yield of marigold. The experiment was conducted in a randomized block design with nine treatments, comprising of four levels of Gibberellic acid (25, 50, 75, and 100 ppm) and Naphthalene acetic acid (100, 150, 200, and 250 ppm) with a control. Based on the findings of the present investigation, it is concluded that both GA3 and NAA had a pronounced effect on the growth and yield of marigold as compared to control. Of these two growth regulators, GA3 @100 ppm was found superior in enhancing the growth parameters like plant height (67.87 cm), plant girth (2.37 cm), plant spread (589.90 cm2), number of branches (35.10) and number of leaves (360.56), and flowering characters like the weight of the flower (7.57 gm) and the diameter of the flower (6.50 cm). whereas NAA @250 ppm was found superior in the rest of the flowering characters and yield parameters like number of flowers per plant (52.10), flower yield per plant (371.12), and flower yield per hectare (30.93 ton).