Field experiment was conducted at research farm, Department of Soil Science and Agricultural Chemistry, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani during kharif season of 2013-14 to study the effect of water soluble fertilizers through fertigation on quality, nutrient content and uptake of Bt cotton. The quality parameters like lint index, ginning percentage and test weight of cotton significantly improved with application of 100 per cent RDF through soluble fertilizers by fertigation over 100 per cent RDF through conventional fertilizers. Application of 100 per cent RDF through soluble fertilizers by fertigation significantly increased nitrogen, phosphorus and potassium content and their uptake in stalk of cotton over the application of RDF through conventional fertilizers.

The present study was carried out during three successive seasons. The experiment was laid out in Randomized block design (RBD) with thirteen treatments replicated four times to study the effect of different nutrient management practices on fruit yield and leaf nutrient composition. The result revealed that among the different treatments combination treatment (T13) with Application of NPK in 8 splits with drip irrigation + vermicompost @ 3 tonne ha-1 and biofertilizers i.e Azotobacter and PSB @ 2000 ml per ha and trichoderma @ 1 kg ha-1 + 8 spraying of Zn (0.5%), Fe (0.5%) and B (0.2%) found to be most effective in producing better yield and yield attributes. However, soil fertility as evident by changes in soil available N, P, K, S, Fe and Zn as well as leaf concentration of N, P, K, S, Fe, Zn and B significantly improved with combining application RDF, vermicompost and biofertilizer with or without fertigation along with foliar feeding of micronutrients viz. Zn, Fe and B.