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<p>The Eastern Indo-Gangetic plains, including Bangladesh, are known for high weed pressure ecologies in rice-based production systems. In the conservation agriculture (CA)-based zero-tillage (ZT) wheat system, which is at the initial stage of evaluation and is being attempted for scaling, but the system faces effective weed control methods. A combination of herbicides can be the best option for controlling diverse weed flora in zero-till wheat fields. Therefore, an attempt was made to evaluate the efficacy and economics of different post-emergence herbicides alone and in combinations. The experiment was conducted in two consecutive years, 2017–2018 and 2018–2019, using a complete randomised block design in the rice–wheat cropping system. Under this experiment, the effects of different herbicides on the wheat growth, yield attributes, weed dynamics, control efficiency and economics were studied. The treatments applied in the study were as follows: T1: a ready-mixed formulation of sulfosulfuron + metsulfuron; T2: a ready-mixed formulation of mesosulfuron + iodosulfuron; T3: pinoxaden; T4: a ready-mixed formulation of carfentrazone + isoproturon; T5: pinoxaden + metosulfuron; T6: pinoxaden + carfentrazone; T7: halosulfuron; T8: halosulfuron + pinoxaden; T9: weedy check; and T10: weed-free. The wheat field was infested and dominated by 13 weed species in both years of the study, including three-four grasses, two sedges, and about eight-nine broadleaf species. Significant differences (p ≤ 0.01) were found in weed density, dry weight, percent mortality of weeds and percentage weed control efficiency with various post-emergence herbicides used for both seasons for all the emerged weed species, indicating that all post-emergence herbicides were able to control weeds effectively. Among these post-emergence herbicides, the combination of pinoxaden + metsulfuron and halosulfuron + pinoxaden performed best at controlling weeds, leading to improved wheat productivity and economics under ZT conditions. Based on the two-year yield and the economic benefits of these three observations, the combination of pinoxaden + metsulfuron and halosulfuron + pinoxaden may be recommended to control wide-spectrum weed flora in CA-based ZT-wheat.</p>

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Productivity and weed control efficiency under zero-tillage wheat (Triticum aestivum L.) influenced by post-emergence herbicides in a high-pressure weed ecology of Bangladesh

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Mst. Tanjina Islam,
  • Akbar Hossain,
  • Md. Sohidul Islam,
  • Md. Shafiqul Islam Sikdar,
  • Annika Jahan Aonti,
  • Md. Parvez Kabir,
  • Saiful Islam,
  • Apurbo K. Chaki,
  • Abdulrahman Alasmari,
  • Ahmed Gaber,
  • Alison M. Laing,
  • Mahesh K. Gathala

摘要

The Eastern Indo-Gangetic plains, including Bangladesh, are known for high weed pressure ecologies in rice-based production systems. In the conservation agriculture (CA)-based zero-tillage (ZT) wheat system, which is at the initial stage of evaluation and is being attempted for scaling, but the system faces effective weed control methods. A combination of herbicides can be the best option for controlling diverse weed flora in zero-till wheat fields. Therefore, an attempt was made to evaluate the efficacy and economics of different post-emergence herbicides alone and in combinations. The experiment was conducted in two consecutive years, 2017–2018 and 2018–2019, using a complete randomised block design in the rice–wheat cropping system. Under this experiment, the effects of different herbicides on the wheat growth, yield attributes, weed dynamics, control efficiency and economics were studied. The treatments applied in the study were as follows: T1: a ready-mixed formulation of sulfosulfuron + metsulfuron; T2: a ready-mixed formulation of mesosulfuron + iodosulfuron; T3: pinoxaden; T4: a ready-mixed formulation of carfentrazone + isoproturon; T5: pinoxaden + metosulfuron; T6: pinoxaden + carfentrazone; T7: halosulfuron; T8: halosulfuron + pinoxaden; T9: weedy check; and T10: weed-free. The wheat field was infested and dominated by 13 weed species in both years of the study, including three-four grasses, two sedges, and about eight-nine broadleaf species. Significant differences (p ≤ 0.01) were found in weed density, dry weight, percent mortality of weeds and percentage weed control efficiency with various post-emergence herbicides used for both seasons for all the emerged weed species, indicating that all post-emergence herbicides were able to control weeds effectively. Among these post-emergence herbicides, the combination of pinoxaden + metsulfuron and halosulfuron + pinoxaden performed best at controlling weeds, leading to improved wheat productivity and economics under ZT conditions. Based on the two-year yield and the economic benefits of these three observations, the combination of pinoxaden + metsulfuron and halosulfuron + pinoxaden may be recommended to control wide-spectrum weed flora in CA-based ZT-wheat.