An experiment was conducted to find out the combined effect of inorganic fertilizers (NPK) and organic manures [vermicompost, poultry manure and farm yard manure (FYM)] on growth, yield and quality of onion cv. Pusa Madhvi in a Randomized Block Design with three replications. The results showed that maximum plant height (73.18 cm), leaf length (56.10 cm), leaf width (4.51 cm), root length (8.02 cm), fresh weight of leaves (55.27 g) and dry weight of leaves (19.61 g) was recorded under the [Recommended dose of fertilizers (RDF) 75% + poultry manure 25%]. While the neck length (5.08 cm), neck diameter (2.04), total sugar (6.60) and specific gravity (1.47) was recorded maximum in T₁ (RDF 100%). The maximum number of leaves (13.60), number of roots/ plant (159.40), bulb diameter (6.59 cm), fresh weight of bulb (159.79 g), number of scale/ bulb (6.56), yield/ hectare (41.88 q) and Vit- C (17.27) was recorded highest under T₃ (RDF 75% + vermicompost 25%). The fresh weight of root (4.24 g) and dry weight of root (2.02 g) was recorded maximum in T₁₀ (RDF 50% + FYM 50%). Therefore, T₃ (RDF 75% + vermicompost 25%) treatment combination was adjudged best for onion cultivation under valley conditions.