INTERACTION EFFECT OF CHEMICAL AND BIO-FERTILIZERS ON GROWTH AND YIELD OF ONION (Allium cepa L.)

The present investigation comprising the supplementation of chemical and biofertilizers for onion crop was carried out under field conditions at Horticultural Research Farm of Babasaheb Bhimrao Ambedkar University, Lucknow during rabi season of 2010-2011. The experiment comprised of four levels of chemical fertilizers and six levels of biofertilizers. The maximum plant heights, number of leaves, neck thickness, bulb diameter, bulb weight, number of scales and yield were found with the application of T12 (100 kg N+50 kg P+70 kg K/ha+2 kg/ha Azotobacter+1.9 kg/ha VAM) that was closely followed by Tn (100 kg N+50 kg P+70 kg K/ha+2 kg/ha Azotobacter+2 kg/ha Phosphobacteria), T18 (75 kg N+37.5 kg P+52.5 kg K/ha+2 kg/ha Azotobacter+1.9 kg/ha VAM) and T17 (75 kg N+37.5 kg P+52.5 kg K/ha+2 kg/ha Azotobacter+2 kg/ha Phosphobacteria) respectively. Minimum number of days required for bulb formation and number of days taken to maturity were also obtained with the application of T12 (100 kg N+50 kg P+70 kg K/ha+2 kg/ha Azotobacter+1.9 kg/ha VAM). Results obtained by the application of inorganic fertilizers with biofertilizers exhibited significant effect on various parameters studied under the investigation.