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Fumesafen herbicide evaluation tests (SL 25% reflex) to control weeds of summer soybean fields were conducted in a Randomized Complete Block Design with 9 treatments and 4 replications during 2020 in Ardabil, Khuzestan and Mazandaran provinces. Experimental treatments include post emergence application of fumesafen (Reflex) 0.5, 1, 1.5 and 2 liters per hectare, trifluralin (Terflan) 2.5 liters per hectare, Metribuzin (Senkor) 0.6 kg per hectare, Imazaethapyr (Pursuit) 0.8 liters per hectare, Bentazone (Basagran) was 3 liters per hectare and hand weeding.. The results showed that in all three regions, there was no significant difference between the herbicide treatments of fumesafen application of 1.5 and 2 liters per hectare while having the highest average soybean yield with manual weeding. In all three regions, weed density for all herbicide treatments was significantly lower than the control treatment without weed control. Fumesafen herbicide 1.5 liters per hectare in Mazandaran, Khuzestan and Ardabil with 90.66, 86.36 and 85.13 percent reduction in weed density reduction compared to the control, with 2 liters of the same herbicide did not differ significantly. And were superior to other herbicide treatments. In Mazandaran, among herbicides treatments, the highest average reduction of weed biomass was 95.13 and 95.58%, in khuzestan, 95.17 and 95.99%, and in Ardabil, 88.89, 88.34% to fumesafen herbicides 1.5 and 2 liters per hectare, respectively. In all three regions, ocular evaluation performed in the middle of the growing season showed the lack of herbicide-burning effects of fumesafen tested on soybean crop. Based on the results of this study, the regenerative application of fumesafen herbicide in the amount of 1.5 liters per hectare can be used to control broad leaf weeds in summer cultivation of soybean fields.
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