Influence of wild mustard (Sinapis arvensis L.) different densities on yield and yield component of winter wheat (Triticum aestivum L.)

A field study was conducted in Fars at Agricultural Experimental Station of Firooz Abad Islamic Azad University in 2006 to evaluate wild mustard densities on wheat yield and yield component. Increasing wild mustard density decreased grain yield, wheat dry matter, spike per plant and seed per spike. Wild mustard had no effect on wheat height and wheat seed weight per 1000 seed. Reduced grain yield ranged from 3.1 to 29.9% at 1 to 16 wild mustard per m2, respectively. At 16 plant per m2 wild mustard reduced wheat spike per m2 by 16.2% and seed number per spike per m2 by 19.6%, when compared to weed free check. Results also showed that increase in wild mustard dry weight, due to increase in mustard density, had negative effect on wheat dry weight. Wild mustard must be controlled either before or shortly after wheat emergence if detrimental effects on wheat are to be minimized.