Vol. 11, Issue 9 (2022)

Author(s):
Anju Jayachandran and Dr. K Ajith Kumar

Abstract:
The experiment was conducted on eight years old mango cv. ‘Sindhuram’ grown under high density planting system with an objective to study the response of growth regulators on physiological and biochemical parameters in mango. The trees were treated with five treatments viz., paclobutrazol (PBZ) @ 8 ml/10 l (T₁), KNO₃ @ 4% (T₂), ethephon @ 200 ppm (T₃), salicylic acid @ 2000 ppm (T₄) and control (T₅) applied through foliar spray one month after pruning and applied twice at 15 days interval. The results revealed that foliar application of KNO₃ @ 4% (T₂) showed highest stomatal frequency (691.44 stomata/mm²), stomatal conductance (0.134 mol m^-2 s^-1), C/N ratio at flowering (14.47) and two months after flowering (13.82) and chlorophyll content (1.95 mg/g). However, no significant difference was observed in leaf photosynthetic and transpiration rate after growth regulator application.