Evaluating the Efficacy of Thifensulfuron- Methyl Herbicide in Soybean for Weeds Control
Evaluating the Efficacy of Thifensulfuron- Methyl Herbicide in Soybean for Weeds Control
Masoumeh Younesabadi1*, Parviz Sharifi Ziveh2 and Sepideh Hatami3
ABSTRACT
In order to evaluate the effectiveness of thifensulfuron-methyl herbicide on broad-leaved weeds in soybean, an experiment was conducted in RCBD with three replications in Golestan, Ardabil and West Azarbaijan provinces in Iran in 2020. The treatments were: trifluralin (Treflan 2.5 L ha-1) as pre plant, bentazon (Basagran 1.5 L ha-1) as post-emergence, thifensulfuron-methyl (15, 30, 45 and 60 g ha-1) and imazethapyr (Pursuit 0.8 L ha-1) as pre-emergence, and weed free treatment. Weed density was measured at 30 days after treatment and weed dry weight was measured before soybean harvesting. Data were analysed with SAS 9.2 and means comparison was done by LSD at p=0.05. Based on the results, the highest weed control efficiency (WCE) and weed control index (WCI), after hand weeding treatment (weed free), was observed in 45 and 60 g ha-1 of thifensulfuron-methyl in Golestan and Ardabil. In West Azarbaijan, similar results were observed for all weeds except Xanthium struamarium, which was controlled by bentazon better than the other treatments. The highest seed yield was obtained by thifensulfuron-methyl 45 g ha-1, being at par with hand weeding (weed free) and thifensulfuron-methyl 60 g ha-1. The highest number of pods/ plant and seeds/pod were obtained by 60 g ha-1 of thifensulfuron-methyl. Visual observation showed no herbicide-burning effects on soybean crop by thifensulfuron-methyl in Ardabil, but 5-10 % phytotoxicity was caused by 60 g ha-1 of thifensulfuron-methyl in Golestan and and West Azarbaijan province, which recovered back after about 2 weeks. Based on the results of this experiment, application of 45-60 g ha-1 of thifensulfuron-methyl can be recommended for the control of broad-leaved weeds in soybean crop.
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