Ranjit KumarSharma, Manoj2016-12-202016-12-202005http://krishikosh.egranth.ac.in/handle/1/91242The investigations on “Effect of plant extracts and growth regulators on the shelf life of guava (Psidium guajava L.)” were carried out during 2003-04 at the Post-harvest Labortary, Department of Horticuture, CCS Haryana Agricultural University, Hisar. Various physical and biochemical parameters were studied to know the efficacy of onion extract, methi seeds extract, GA3 and cytokinin at different concentrations to improve the storage life of guava cv. Hisar Safeda. Post-harvest application of onion extract (100%) followed by methi seeds extract (100%) and onion extract (50%) decreased physiological loss in weight (%) and rotting (%) during storage. The quality of fruits was also appreciably IMPROVED by retaining more firmness, TSS, total sugars, reducing sugars and non-reducing sugars. Post-harvest treatment of GA3 (100 ppm), cytokin (20 ppm) and GA3 (50 ppm) also decreased physiological loss in weight (%) and rotting (%). The quality of the fruit was increased. TSS, total sugars, reducing sugars and non-reducing sugars were increased during storage. It can be concluded that the storage life and quality of guava fruits can be improved by onion extract (100%), methi seeds extract (100%), GA3 (100 ppm) and cytokinin (20 ppm).enThesis