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VOL. 8, ISSUE 4 (2026)
Studies on use of post emergent herbicides on weed dynamics, weed control efficiency, yield and economics of Bt cotton
Authors
Israr Ulhaq Inamadar, D H Patil, Pandit S Rathod, Ananda, N, Raju G Teggelli
Abstract
A field experiment was conducted at the Main Agricultural Research
Station, University of Agricultural Sciences, Raichur, Karnataka, during kharif
2025 to evaluate the efficacy of different weed-management practices on weed
control, seed-cotton yield and economics in Bt cotton. The experiment
was laid out in Randomized Complete Block Design (RCBD) with ten treatments and
three replications. The results revealed that among the herbicides, application
of pyrithiobac sodium 10 % + clethodim 10.25 % SE at 283 g a.i. ha-1
at the 3-4 leaf stage as a post-emergence treatment, followed by
intercultivation at 45 days after sowing (DAS), recorded significantly lower
total weed density (2.35, 1.96, 2.68 and 3.76 at 15, 30, 45 and 60 DAS
respectively), lower weed dry matter (2.14, 1.90, 3.20 and 5.28 g m-2 at
15, 30, 45 and 60 DAS respectively) and higher total weed control efficiency
(90.97, 94.40, 93.33 and 86.90 per cent at 15, 30, 45 and 60 days after
herbicide application, respectively) and a lower weed index (9.92 %). However,
this treatment was statistically at par with application of the same herbicide
combination at 243 g a.i. ha-1 at the 3-4 leaf stage,
followed by intercultivation at 45 DAS. The application of pyrithiobac sodium
10 % + clethodim 10.25 % SE at 283 g a.i. ha-1 also recorded
higher seed cotton yield (2680 kg ha-1), gross returns (₹ 2,00,975
ha-1), net returns (₹ 1,23,580 ha-1) and benefit cost
ratio (2.60). From the present investigation, it can be concluded that
application of pyrithiobac sodium 10 % + clethodim 10.25 % SE at 243 g a.i.
ha-1 at the 3-4 leaf stage, followed by intercultivation at 45 DAS,
was the most economically favourable herbicidal treatment for effective weed
management and improved seed-cotton productivity in Bt cotton.
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Pages:194-200
How to cite this article:
Israr Ulhaq Inamadar, D H Patil, Pandit S Rathod, Ananda, N, Raju G Teggelli "Studies on use of post emergent herbicides on weed dynamics, weed control efficiency, yield and economics of <i>Bt </i>cotton". International Journal of Ecology and Environmental Sciences, Vol 8, Issue 4, 2026, Pages 194-200
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