بررسي ميزان رقابت و خسارت تراكم هاي متفاوت يولاف وحشي در زراعت گندم زمستانه

To determine the competitive ability of wild oat (Avena ludoviciana Durieu) with wheat (Triticum aestivum L. "GHODS" ), an experiment was conducted in partial additive under field conditions. Weight of 1000 seeds, length of wheat spike, number of seeds in spike and specially number of tiller and wheat yield decreased when density of wild oat increased.Wheat yeild decreased by 10 plantlm^2 wild oat significantly, It decreased weight of yeild %21.60 compared with control. The density of 200 plant/m^2 decreased %43.21 compared with control. Yield loss model for three years showed that wild oat in density of 8 plants / m2 was the critical density in wheat yield loss in this experiment.