A premier field research was carried out to study the effect of plant growth regulators GA3 pretreatment and variety on the growth and yield of tuberose cut flower. The two-factor experiment was laid out with Randomized Complete Block Design (RCBD) with three (03) replications and two factors, viz. variety, i.e. Single (V1), Double (V2) and concentration of GA3 (0, 50, 100, 150 ppm). Data were evaluated with MSTAT-C software package and sums were separated by Duncan’s multiple range test (DMRT) at 1% level of significance. Results exhibited that the pretreatment of different concentrations of GA3 had significantly upgraded different growth and yield parameters. Highest vegetative growth traits in terms of plant height, number of leaves per plant, length and breadth of leaf and yield traits such as length of spike and rachis, the weight of spike, numbers of floret per spike, the diameter of the floret, length of the floret, number of spike per plant, the yield of spike per hectare was observed in double variety and lowest in a single variety. In case of GA3 concentration, 150 ppm GA3 pretreated bulbs had the highest vegetative growth and yield traits, while the lowest of above these parameters were perceived with G1 (control). Combined results of GA3 and tuberose cultivar (single and double) revealed that double cut flower with 150 ppm GA3 pretreatment (V2G4) had the highest vegetative and reproductive parameters and the lowest growth and yield was obtained from the combination of control with single cut flower (V1G1). Therefore, it was concluded that double variety, when combined with 150 ppm GA3 concentration, proved to be the greatest combination in enhancing all the vegetative and yield characteristics in tuberose.

Keywords: Gibberellic Acid, Plant growth regulator, Tuberose, Growth and Yield