Pawar, K.N.Gudimani, Umesh2021-03-272021-03-272016-06https://krishikosh.egranth.ac.in/handle/1/5810163171A field experiment was conducted during kharif 2013 to study the use of micronutrients for enhancing the productivity in Bt Cotton at the Main Agricultural Research Station, University of Agricultural Sciences, Dharwad, The experiment consisted of nine treatments viz., FeSO4, ZnSO4, MgSO4, MnSO4, Boron and combination of MnSO4 + ZnSO4, MgSO4 + ZnSO4¬¬ and FeSO4 + ZnSO4 ¬-foliar spray of all these at 70 and 90 DAS. The experiment was laid out in randomized block design with three replications. Among all the treatments, foliar spray with MgSO4 1 % + ZnSO4 0.5 % recorded highest number of leaves per plant (163.22), total dry matter (224.50 g plant-1), leaf area index (2.75 dm2 plant-1), absolute growth rate (4.37 g day-1), crop growth rate (8.09 g dm2 day-1), relative growth rate (0.0127 g g-1 day-1), net assimilation rate (0.0244 g dm2 day-1), relative water content (69.86 %), photosynthetic rate (30.01 µ mol CO2 m-2 s-1), stomatal conductance (0.677  mol CO2 m-2 s-1), transpiration rate (7.41  mol H2O m-2 s-1), proline (102.60 µg g-1 fresh weight) and total chlorophyll (2.47 mg g-1 fresh weight) as compared to control and other treatments. Similar trend were also observed on higher yield components like seed cotton yield, (2,393 kg ha-1), boll weight (6.35 g boll-1) and number of bolls per plant (46.0) followed by the treatment foliar spray by FeSO4 0.5 % + ZnSO4 0.5 % and MgSO4 1 % and the minimum yield and yield components were recorded under control. It is concluded that, application of foliar spray with MgSO4 1 % + ZnSO4 0.5 % more effective in increasing the yield in Bt-cotton.EnglishThesis