Vol. 13 No. 3
Integrated weed management for Bt cotton hybrid
Author(s): V. Hariharasudhan, C. Chinnusamy and N. K. Prabhakaran
Abstract: Time of sowing and canopy density influence the interaction between weeds and cotton however, little is known about time of sowing response to weed interference in cotton productivity. A field experiment was conducted at Tamil Nadu Agricultural University, Coimbatore during 2015 and 2016 to quantify the influence of time of sowing and weed management methods on weeds interference and seed cotton yield. Crop growth response to weed interference in different time of sowing with weed management was determined in Bt cotton hybrid. Results revealed that, cumulated thermal time (GDDs) was maximum in early sown cotton (1st August) beyond 15th August sowing experienced minimum cumulative GGDs in 15th September. Higher weed density and weed dry weight drastically increased in delayed sowing time from 1st August to 15th September. Pre-emergence pendimethalin 38.7 per cent CS followed by post-emergence pyrithiobac sodium 5% EC 62.5 g ha-1 recorded lower weed density,dry weight and higher weed control efficiency at 40 DAS. Better growth, higher yield parameters and seed cotton yield were recorded when sowing was done on August.
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