Abstract: A field experiment was conducted to study the effect of micronutrients application in onion in medium black soils at Regional Agricultural Research Station, Vijayapur, during Rabi, 2021-22. The experiment was laid out in factorial RBD with single control design with three replications.There were ten treatment combinations, consisting three levels of zinc (0, 15 and 30 kg ZnSO4 ha-1) in first factor and three three levels of iron (0, 15 and 30 kg FeSO4 ha-1) in second factor these nine combinations were compared with absolute control.The results revealed that the soil application of 30 kg ZnSO4 ha-1 + 30 kg FeSO4 ha-1 recorded significantly higher plant height (48.08 cm), number of leaves (13.42), leaf dry matter (4.58 g plant-1), bulb dry matter (12.09 g plant-1), polar diameter (6.28 cm), equatorial diameter (5.16 cm),bulb index (1.37), average weight of fresh bulb (76.04 g), average weight of cured bulb (64.43 g), bulb yield (18.56 t ha-1), ‘A’ grade bulbs (11.83%), ‘B’ grade bulbs (74.15 %) and significantly lower ‘C’ grade bulbs (14.02%),While, lower plant height (39.36 cm), number of leaves(11.23), leaf dry matter (3.43 g plant-1), bulb dry matter (8.69 g plant-1), polar diameter (4.87 cm), equatorial diameter (4.17 cm), bulb index (0.92), average weight of fresh bulb (63.96 g), average weight of cured bulb (52.91 g), bulb yield (10.30 t ha-1),‘A’ grade bulbs (9.01%) and ‘B’ grade bulbs (52.35%) were recorded in treatment receiving only RDF. The soil application of zinc sulphate and iron sulphate either alone or in combination helped to improve growth, yield and quality parameters of onion.