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Escalating cost of inorganic fertilizers coupled with depleting soil organic carbon and inconsistency in response of fertilization has attracted worldwide investigation on different INM based modules to raise vegetable onion (Allium cepa L.) productivity via improvement in supply levels of available nutrients in soil.In the light of limited efforts on the methods of improving manures efficiency,studies were carried out at the Experimental Farm (25°45′43″ N latitude and 93°53′04″ E longitude) of Department of Horticulture to evaluate different organic manure based treatments viz.,T1 (control-untreated),T2 (FYM,farmyard manure at 30 tons ha),T3 (pigmanure at 20 tons ha-1),T4 (vermicompost at 5 tons ha-1),T5 (Azotobacter at 10 g 10 kg-1 bulbet),T6(FYM + Azotobacter),T7(pigmanure + Azotobacter),and T8(vermicompost + Azotobacter) computed on N-equivalent basis using onion (variety Agrifound Dark Red) as test crop on Kandic Rhodustalf soil type under humid tropical climate of Nagaland.Various observations included:growth parameters (plant height,number of leaves/plant,neck thickness and time taken to maturity),yield and yield attributes (bulb diameter,bulb weight,yield),and quality parameters (dry matter content and total soluble solids as °brix).