Effect of Rye (Secale cereale) and Wild Mustard (Sinapis arvensis) Competition on Yield and Yield Ccomponents of Two Winter Wheat (Triticum aestivum L.) Cultivars

This research was investigated to evaluate yield and yield components response of two wheat cultivars in interference with two narrow leaf and broad leaf weed species in two separated experiments based on a randomized complete block design with 3 replications at Agricultural Faculty of Bu-Ali Sina University, in 2008-2009 growing season. In both Experiments, Alvand and Sayson cultivars were planted with densities of 450 plants m-2. In the 1st experiment, rye with target densities of 0, 20, 40, 60 and 80 plants m-2 were planted in between wheat rows. In the 2nd experiment, wild mustard density was 0, 8, 16, 24 and 32 plants m-2. The results showed that increasing plant density of both weed species reduced significantly biologic and grain yield, number of spikes and reproductive tillers per unit area, grain number per spike, 1000 seed weight and harvest index. In weed density treatments for both weeds, individual plant of wild mustard damaged more than rye individual plant on wheat cultivars. Overall, however in non-interference condition Sayson had higher yield and yield components than Alvand, but was affected more than Alvand by both weed species.