Mohammad Hassan Ebrahimpour - Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Ali Mokhtassi-Bidgoli - Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Majid Aghaalikhani - Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Hamed Eyni-Nargeseh - Department of Agricultural Science, Technical and Vocational University (T. V. U.), Tehran, Iran.

The current study assessed the effects of common herbicides produced by different companies on broadleaved and grass weed control and quantitative traits of irrigated wheat. A two-year experiment (۲۰۱۳-۲۰۱۴ and ۲۰۱۴-۲۰۱۵) was designed as an RCBD with three replications. Experimental treatments included two control treatments (weedy and weed-free) and ۱۵ herbicides produced by three Iranian companies (Ghazal, Golsam-Gorgan, and Gyah) and three international companies (BASF, Nufarm, and Syngenta). The results showed that H۱۳ (bromoxynil + MCPA from BASF tank-mixed with clodinafop propargyl from Golsam Gorgan) and H۱۴ (bromoxynil + MCPA from BASF tank mixed with clodinafop propargyl from Ghazal) treatments in ۲۰۱۴ and H۵ (tribenuron methyl from Gyah) and H۹ (clodinafop propargyl tank-mixed with tribenuron methyl from Golsam Gorgan) in ۲۰۱۵ almost completely controlled broadleaved and grass weeds. In ۲۰۱۴, H۴ (۲,۴-D + MCPA from Nufarm) and H۱۳ treatments with the averages of ۷۵۰۵ and ۷۳۳۸ kg ha-۱ ranked first and second in grain yield, while H۹ and H۱۲ (bromoxynil + MCPA from BASF tank-mixed with clodinafop propargyl from Gyah) with the averages of ۷۹۶۶ and ۷۹۱۷ kg ha-۱ were known as superior treatments in ۲۰۱۵. Averaged by years, the grain yield was ۳۱۸۵ kg ha-۱ at weedy treatment (H۱۷). Although there were no significant differences between herbicides, the grain yield (averaged by years and herbicides) was boosted by ۸۸% compared with the weedy treatment. It was concluded that more rainfall and desirable air temperature positively affected the efficacy of the herbicides.

herbicide performance, interspecific competition, manufacturer, wheat-weed relationship