International Journal of Environment and Climate Change

A field experiment was carried out on 8 years old guava cv L 49 trees to assess the effect of pruning level and growth regulators with different combinations on vegetative growth and fruiting attributes in Ultra High Density Planting. The experiment consisted of 2 factors with 36 combinations viz., factor -1 (pruning level) P₁- pruning of 25 cm of the shoot from the tip, P₂- pruning of 50 cm of the shoot from the tip, P₃- pruning of 75 cm of the shoot from the tip, P₄ – control (without pruning). Factor -2(growth regulators) G₁, G₂- Potassium nitrate (1 ,2%), G₃, G₄- Thiourea (0.1 ,0.2%), G₅, G₆- Ethephon (250, 500 ppm), G₇, G₈- Cycocel (250, 500 ppm) and G₉ – Control. Results showed that among different levels of pruning, 50cm pruning from the tip with potassium nitrate spray at 2 different concentrations was found to be the best for promoting early vegetative bud burst, fruit set and fruit yield. The increment in plant height and canopy spread in East-West and North-South were recorded more in 25 cm pruning from the tip. A greater number of shoots are visible in the P₃G₅ combination. When compared to other treatments, the P₃G₂ combination significantly increased the average index number of bud bursts and shoot length under Ultra High Density Planting.