PRE-HARVEST APPLICATION OF PLANT GROWTH REGULATORS ON ROSE 'POISON'

This research evaluated the effects of different levels of gibberellins (GA₃) (150, 200, 250 and 300 mg L^-1), salicylic acid (SA) (50, 100, 150 and 200 mg L^-1) and cycocel (CCC) (500, 1000, 1500 and 2000 mg L^-1) at pre-harvest period on the quality, yield and vase life of rose (Rosa hybrid ‘Poison’). Treatments were compared with control plants (distillation water) in a randomized complete block design with 3 replications. Results showed that the effects of plant growth regulators on bud length, vase life and yield were significant at P≤0.05 and on fresh weight and flower height were significant at P≤0.01. Highest yield obtained in 200 mg L^-1 GA₃ with 192 cut flowers per year per m² and highest vase life obtained from 150 mg L^-1 SA (12.67 days). 300 mg L^-1 GA₃ with 49.33 cm flower height was best between treatments.