Estimation of Yield and Nutrient Uptake by Onion under the Influence of Inorganic, Organic and Bio-Fertilizers

An investigation was carried out to assess the integrated use of inorganic, organic (FYM, pressmud, poultry manure and vermicompost) and bio-fertilizers (Azotobacter, Azospirillum and phosphate solubilizing bacteria) on yield, nutrient uptake byonion and nutrient pool of the soil during Rabi season of the year 2013-14. There was a significant effect of various treatment found on the yield, nutrient uptake and soil nutrient reserve. Maximum yield per hectare were found in 50 per cent recommended NPK + 50 per cent vermicompost while minimum yield was observed in control. Maximum uptake of nitrogen and potassium was obtained in treatment combination 50 per cent recommended NPK + 50 per cent vermicompost whereas maximum uptake of phosphorus was found in treatment combination 50 per cent recommended NPK + 50 per cent pressmud. Among different treatment combination highest nitrogen and potassium reserve in soil was found in treatment combination 50 per cent recommended NPK + 50 per cent vermicompost while maximum value for organic carbon percentage was in sole vermicompost application.