Vol. 9, Issue 12 (2020)

Author(s):
Dr. K Kumanan, Dr. M Manikandan and Dr. T Saraswathi

Abstract:
The present investigation was carried out with an objective to study the yield response of various Plant Growth Regulators in Lab lab (Dolichos lablab L.) at University Orchard, Department of Vegetable Crops, Horticultural College and Research Institute, TNAU, Coimbatore during 2015 to 2018. The experiment was laid out in Factorial Randomized Block Design with nine treatments and three replications. The treatment were T1 – Water Spray (control), T₂ – NAA @ 50 ppm,T₃ –NAA @ 100 ppm, T₄ –Ethrel @ 250 ppm, T₅ – Ethrel @ 500 ppm, T₆ –Cycocel @ 500 ppm, T₇ –Cycocel @1000 ppm, T₈ –Nitrobenzene @ 50 ppm and T₉ – Nitrbenzene @100 ppm. The foliar sprays were imposed on 30, 60 and 75 days after sowing. Studies revealed that the yield and yield contributing characters of Dolichos bean differed significantly due to foliar spray treatments of different plant growth regulators. Among the different foliar treatments, NAA @ 100 ppm (T₃) and NAA @ 50 ppm (T₂) recorded earlier flowering (44.88 days and 44.07 days respectively) followed by Nitrobenzene 50 ppm (T8) (45.59 days) found to be the best. Application of NAA @100 ppm recorded the highest number of flowers/plant (241.85 flowers/plant), number of fruits/plant (178.91/plant) and highest yield/plant (0.39 kg) as compared to control.