Author(s):

SS Thakare, AN Paslawar, JP Deshmukh, KJ Kubde, BV Saoji and PV Shingrup

Abstract: A field investigation “Effect of fertigation levels and weed management practices on weed flora and seed cotton yield of Bt cotton” was conducted at AICRP on weed management farm, Department of Agronomy, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola during kharif season 2017. The experiment was laid out in Split plot design with three replications. The main plot treatments comprised of different levels of fertilizer in five splits at 75%, 100% and 125% RDNK/ha of fertilizers given through fertigation, however P was applied as basal dose and these treatments were compared with 100% soil application of fertilizers. Whereas, sub plot treatments comprised of five weed management practices viz. pendimethalin 1 kg a.i/ha PE fb pyrithiobac sodium 0.062 kg a.i/ha + propaquizafop 0.075 kg a.i/ha 25-30 DAS + 1 hand weeding at 45-50 DAS, pendimethalin 1 kg a.i/ha PE fb paraquat 0.6 kg a.i/ha at 40-50 DAS directed spray of paraquat 0.3 kg a.i/ha at 30 DAS fb 1 HW 15 days after spraying and paraquat 0.6 kg a.i/ha 60 DAS fb 1 HW 15 days after spraying, Farmer practices (3 hoeing 15-20 days interval after sowing fb 3 HW) and weedy check. Results revealed that, highest weed control efficiency and yield attributes viz. bolls picked and seed cotton yield plant^-1, seed cotton yield kg ha^-1 were recorded under drip fertigation with125 percent RDNK in 5 splits followed by 100 and 75 percent RDNK in 5 splits at all growth stages of crop. The lowest weed control efficiency was recorded at 100 percent RDF through soil application as compared to different level of drip level of fertigation. In cotton yield attributes viz. bolls picked and seed cotton yield plant^-1 were substantially enhanced by drip fertigation level at 125% RDNK/ha than lower fertigation levels 75%, 100% and over conventional soil application with 100% RDF. As a consequence of better yield attributes, drip fertigation at 125% RDNK/ha had recorded higher seed cotton yield of 2640 kg ha^-1. Among the herbicidal treatments, directed spray of paraquat 0.3 Kg a.i/ha at 30 DAS fb 1 HW 15 days after spraying and paraquat 0.6 kg a.i/ha at 60 DAS fb 1 HW 15 days after spraying recorded significant reduction in weed density, weed dry matter, highest weed control efficiency and lowest weed index. Which ultimate resulted in maximum seed cotton yield.

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