Studies were conducted at farmer's field of village Pithala (near N.D. University of Agriculture and Technology. Kumarganj, Faizabad, U.P.) to determine the effect of different concentrations of Gibberellic acid, Napthalene acetic acid and Ethephon on growth and yield characters of Kharif onion. GA3 and NAA increased plant height, number and size of leaves, and umbels per plant when their concentrations were increased from 150 to 300 ppm, whereas higher concentration (450 ppm) had depressive effect. Ethephon on the other hand showed continuous decrease in plant height with increasing concentrations from 150 to 450 ppm. Among different hormones used, NAA 300 ppm treated plants produced highest seed weight and yield of onion seeds.
