Effect of chemicals, PGRs and pruning on morpho-physiological parameters in mango under high density planting

Investigations on the effect of canopy management in mango (Mangifera indica L) cv Alphonso using chemicals, different growth regulators and pruning methods under high density planting were conducted during 2015–2016. The treatments were evaluated in terms of changes in morpho-physiological attributes. Among eight treatments, soil drenching of paclobutrazol registered the lowest canopy diameter and length and highest girth of shoots. The chlorophyll a, b and total chlorophyll contents and SPAD value of the leaves were significantly improved by the application of growth retardants particularly paclobutrazol and chlormequat chloride. Specific leaf weight was markedly improved by the application of growth retardants. Statistically superior soluble protein content and maximum level of total phenolics were observed in paclobutrazol applied trees followed by triple spray of chlormequat chloride at pre-flowering stage (Dec 2015).