Misra, K.K.Bhawna2016-07-132016-07-132010-06http://krishikosh.egranth.ac.in/handle/1/68713Thesis-PhDThe present investigation was carried out in Randomized Block Design with two replications and one tree per replication, at Horticultural Research Centre, Patharchatta, Govind Ballabh Pant University of Agriculture & Tecnology, Pantnagar, Uttarakhand to study the Clonal variation in growth, yield and physiological parameters of Bael (Aegle marmelos Correa). The results showed that clones significantly affected the growth, yield, chlorophyll ‘a’ content, net photosynthetic rate (Pn), transpiration rate (E), stomatal conductance (gs), internal CO2 concentration (Ci), reference H2O concentration (mb reference), leaf temperature (Tl), water use efficiency (WUE) and mesophyll efficiency. Among the nineteen clones, Pant Shivani, Pant Bael-17, Pant Sujata, Pant Aparna and Pant Urvashi were found to be the best on yield and yield characteristics. The maximum net photosynthetic rate (Pn) was recorded in Pant Shivani and minimum Pn was observed in Pant Vishal. There was a significant variation in Pn, E, gs, Ci, mb reference, Tl, WUE, mesophyll efficiency and chlorophyll ‘a’ content among the clones. A positive and significant correlation was observed amongst tree height and tree volume; tree spread and stem girth; cross trunk sectional area (C.T.S.A.) and tree volume; tree height and stem girth; C.T.S.A. and tree height; leaf area and per cent leaf dry weight; chlorophyll content and Pn; internal CO2 concentration and Pn; transpiration rate (E) and Ci; water use efficiency and Pn; WUE and mesophyll efficiency; chlorophyll a content and yield while there was a negative and significant correlation among Pn and reference H2O concentration; stomatal conductance and leaf temperature; transpiration rate and leaf temperature.enclonal variation, growth rate, yield increases, plant physiology, Aegle marmelos, medicinal plants, horticultureThesis