Vol. 7, Issue 6 (2019)
Nutrient uptake of weeds and Bt cotton as influenced by fertigation levels and weed management practices
Author(s): SS Thakare, AN Paslawar, SU Kakade, MR Deshmukh and ND Parlawar
Abstract: A field investigation “Nutrient uptake of weeds and Bt cotton as influenced by fertigation levels and weed management practices†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% of recommended dose of N and K 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 lowest weed index 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. Higher uptake of N (130.95 kg/ha), P (33.04 kg/ha) and K (92.24 kg/ha) by cotton crop plants were observed at 125 per cent levels of N and K fertigation. 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. Among the different weed control measures weedy check recorded significantly higher N (59.85 kg/ha), P (12.87 kg/ha) and K (29.73 kg/ha) uptake by weed. The herbicidal treatment 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 lower value of nutrient uptake N (25.60 kg/ha), P (5.82 kg/ha), K (10.30 kg/ha) by weeds than rest of herbicidal treatments. Whereas significantly higher nutrients uptake by crop plants N (122.04 kg/ha), P (32.29 kg/ha) and K (98.60 kg/ha) recorded in treatment 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.
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How to cite this article:
SS Thakare, AN Paslawar, SU Kakade, MR Deshmukh, ND Parlawar. Nutrient uptake of weeds and Bt cotton as influenced by fertigation levels and weed management practices. Int J Chem Stud 2019;7(6):2381-2386.
