Current Advances in Agricultural Sciences(An International Journal)

Climatic changes have impact on the vegetative and reproductive phases of mango and there by affect the heat use efficiency. Thermal regimes significantly influence on the pattern of flowering, fruit set and development in mango cv. Amrapali at subtropical condition. Based on recent information of the years (2020 to 2022), thermal heat accumulation in flowering (BBCH scale 510 to 627) was 804.34±37.9 to 883.48±37.3°Cd, pea phase having 1108.36±155.0 to 1274.26±186.1, marble phase attained a range of 1643.90±165 to 1930.1±188.9°Cd and finally at the maturity (BBCH scale 810, 819 to 829), the values varied from 2218.98±166.8 to 2611.94± 191.0°Cd in mango cv Amrapali. The estimated heat use efficiency varied between 2.25 to 5.43 in 2020, 2.52 to 6.12 in 2021 and 2.39 to 5.77 g/m²/°Cd in 2022. It was observed that the heliothermal regimes existed at vegetative phase (BBCH scale of 011 to 319) of2938.14 to 7539.89°Cd h to maturity 12422 to 14587.32°Cd while photothermal regime indicated variability from 7146.66 to 7539.89 and 30225.72 to 35599.15°Cd h respectively. Histographic distribution of thermal regimes showed changes in each BBCH scale phenophases at subtropical condition. Scientific analysis clearly showed the effects of climate on the BBCH scale based thermal regimes across three consecutive Amrapali production phases. The present study was thus is an indicative of climate vis-à-vis tree responses under varying thermal regimes of subtropical Indian condition.