investigation of growth indices and yield of two wheat) triticum aestivum l.( cultivars in competition with rye (secale cereale l.) and wild mustard (sinapis arvensis l.) weeds

this research was investigated to evaluate growth indices and competitive ability of two wheat ) triticum aestivum l. (cultivars in interference with two species of narrow and broad leaf weeds as two separated experiments based on a randomized complete block design with three replications at agricultural faculty of bu-ali sina university, during 2008-2009. in both experiments, alvand and sayson cultivars were planted at 450 plants.m-2. in the 1st experiment, rye (secale cereale l.) with densities of 0, 20, 40, 60 and 80 plants.m-2 were planted between wheat rows. in the 2nd experiment, wild mustard (sinapis arvesis l.) with densities of 0, 8, 16, 24 and 32 plants.m-2 were planted. results showed that increasing plant density in both weed species led to reduction of leaf area index, dry matter accumulation, crop growth rate, leaf area index duration, biomass duration, and yield of wheat cultivars. mentioned traits and grain yield of alvand showed less decrease in competition with both weed species. sayson plant height was decreased with increasing weed density but such observation was not found in alvand cultivar. individual plant damage of wild mustard on two wheat cultivars was more than that of rye. overall, alvand competability against both weed species was more than sayson.