عنوان مقاله [English]
نویسندگان [English]چکیده [English]
A field experiment was conducted at the experimental field of Iranian Research Institute of Plant Protection, Karaj city in 2006 to investigate the effect of different doses and application timeing of metribuzin on grain yield of different wheat varieties. The experiment was arranged at factorial in randomized complete blocks design with four replications. The factors investigated were three wheat varieties: Shiraz, Pishtaz and M-79-6 line; 4 metribuzin doses: 1.0, 0.75, 0.5 and 0.0 kg ha-1 and herbicide application times: preemergence and postemergence at three to four- leaf stage of wheat. The results indicated that wheat seed yield and yield components were significantly affected by doses and application timing. The highest wheat yield for all varieties was observed in postemergence metribuzin at 0.5 and 0.75 kg.ha-1. Mean while, postemergence application of metribuzin was better than preemergence. Final deduction from the experiment is that postemergence use of metribuzin at 0.5 kg.ha-1 can be recommended in the above-mentioned wheat varieties.