An investigation was carried out at University of Agricultural Sciences, Dharwad to study the shelf life of kharif onion as influenced by the different sources of nitrogen. Nine sources of nitrogen (including organic and inorganic) along with control (with no added nitrogen) were studied for their influence on physiological loss in weight (PLW), rotting and sprouting as well as total loss. The highest PLW (%) was recorded by control whereas, poultry manure resulted in least PLW (%) at all stages. Rotting losses were significantly highest with the application of urea but, the organic sources like vermicompost, sheep manure and bhoomilabh resulted in 15.86, 16.57 and 16.86 per cent cumulative rotting loss at the end of 90 days storage period. The control exhibited significantly higher sprouting loss in onion bulbs during storage indicating lack of nitrogen. Conversely, the bulbs obtained from application of agrigold and vermicompost showed lower sprouting losses. Hence, the treatment control resulted in maximum total loss (59.83 %) followed by urea (57.22 %). The organic sources like agrigold, poultry manure, vermicompost and sheep manure were found beneficial in reducing the storage losses in onion.