تأثیر بستر بذر کاذب و تراکم کاشت ارقام مختلف گندم زمستانه برکنترل چاودار(Secale cereale L. ) و عملکرد گندم زمستانه (Triticum aestivum L.)

Rye is one of the most problematic wheat weeds. So far, no selective herbicide has been introduced to control it in this crop. To evaluate the effect of false seedbed preparation and sowing density on rye (Secale cereale L.) control an experiment was conducted during 2013 in Agriculture and Natural Resources Research and Education Center Chaharmahal & Bakhtiari province (Shahrekord). Experimental factors arranged in split plot factorial design with three replications. The main plots included seed bed preparation in three levels: 1. conventional cultivation of wheat 2. After seed bed preparation and irrigation, rye and other weeds controlled by chemical control (2 L ha-1 paraquat) before wheat cultivation, 3. After seedbed preparation and irrigation rye and other weeds controlled by mechanical control (harrowing), before wheat cultivation. Subplots included complete factorial of winter wheat cultivar and sowing density (seed rate). Alvand Pishgam and Back Cross Roshan cultivars at 200 kg seed per hectare, 25 and 50 percentage more than recommended seed rate. Results showed that the rye density in false seed bed chemical control decreased75.7% and 65.4% relative to conventional and false seed bed mechanical control, respectively. Also rye biomass in false seed bed chemical control decreased74.9% and 68.4% relative to conventional and false seed bed mechanical control, respectively. Pishgam cultivar, reduced rye density 36.9% and 18.7% relative to Alvand and Back Cross Roshan cultivars, respectively, also rye biomass at the seeding rate of 200 kg ha-1 reduced 29.3% and 35.5%, relative to 250 and 300 kg ha-1 seeding rate, respectively. .