Int. J. Biosci.15(3), 23-30, September 2019
Fertilizer management during reproductive stage of cotton is being attention to the researcher due to this stage root activities decrease by cotton plant. To mitigate the problem and evaluate optimum foliar fertilizer combination of nitrogen, potassium and boron for feeding of plant an experiment was conducted at Central Cotton Research Farm, Sreepur, Gazipur during cotton growing season of 2009-2011. Cotton variety cv. CB-10 was used under experiment. Eight combination levels of Nitrogen, Potassium and Boron T0 (0.00 –0.00 – 0.00), T1 (7.50 – 40 – 0.75), T2 (7.50 – 40 – 1.00), T3 (7.50 – 50 – 0.75), T4 (7.50 – 50 – 1.00), T5 (9.00 – 40 – 0.75), T6 (9.00 – 40 – 1.00), T7 (9.00 – 50 – 0.75), T8 (9.00 – 50 – 1.00) g L-1 water were foliar sprayed at reproductive stage of cotton as treatment. The design of the experiment was randomized completely block design (RCBD) with three replications. The result show that, plant height (92.17 cm), Boll plant-1(23.57), boll weight (5.27 g), seed cotton yield (1.39 t ha-1), Lint yield (0.49 t ha-1), Seed yield (0.90 t ha-1), 50% span length (12.19 mm), Oil (20.51%) and protein (20.11%), seed index (10.20), germination(88.09%), shoot and root length(11.78 cm, 10.91 cm) were maximum from T4 (7.50 – 50 – 1.00) foliar nitrogen, potassium and boron treatment combination. Incase of all parameter without foliar fertilizer results was lowest except electric conductivity that is (149.57 μscm -1g-1). In future need to conduct research for pathways of nutrient absorption in cotton plant.
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