Evaluation of the effect of mixture of herbicides on weeds control in rainfed bread wheat (Triticum aestivum L.) in Ardabil

To study the effect of mixture of herbicides on weeds control in rainfed bread wheat in Ardabil (Germi, Iran) a filed experiment was carried out using randomized complete block design with four replications in 2009-2011 cropping seasons. Experimental treatments included hand weeding, 2, 4-D (U 46D), Clodinafop - propargyl (Topic), Fenoxaprop pethyl+ Mefenpyridiethyl (Puma Super), Tribenuron methyl (Granstar), Difenzokvat (Avenge), 2, 4-D + Topic, Topic + Granstar, Puma Super + 2, 4-D, Puma Super + Granstar, Avenge + 2, 4-D, Avenge + Granstar, control (Weedy) and fallow with roundup (glyphosate). Herbicides were used at recommended doses. Analysis of variance showed that different herbicides had significant effect on reduction (%) of Gladiolus, wild oats and other weeds density. Maximum reduction (%) of Gladiolus (100%, 88.12% and 61.32 %), wild oats (93.24%, 95.13 % and 94.72 %) and other weeds density (83.36%, 98% and 75.90%) was observed in two times hand weeding, fallow + Glyphosute and Topic + Granstar, respectively, also maximum reduction (%) of Gladiolus and other weeds biomass was observed in Topic + 2, 4 -D. of Year × herbicide interaction effect was significant on grain yiled. The higher grain yield was obtained in Topic (2595 kg.ha-1), hand weeding (2571 kg.ha-1) and Pumasuper + Granstar (2269 kg.ha-1) in 2010. In conclusion, results of this experiment showed that Topic or Topic + 2, 4-D can be used for weed control in rainfed weed in Germi region in Ardabil province of Iran. Aplication of Pumasuper + Granstar is also an option.