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A Two-year field experiment was carried out in 2009 and 2010 to evaluate the effects of different densities of wild oat andnitrogen (N) rates on oilseed rape yield and yield components. Experimental design was split plot with three replications.Increased nitrogen rates up to 150 kg N/ha caused an increase in oilseed rape grain yield in weed-free plots (4.26 t/ha;1t = 103 kg), while even at the lowest density of wild oat (15 plants/m2), increasing N fertilizer only up to 50 kg/ha led toa significant increase in grain yield. Wild oat growth was favored by high levels of N. Intraspecific competition reducedbiomass, 100-seed weight and number of tillers of wild oat. Both lower N rate and intraspecific competition had negativeeffect on wild oat growth but the weed was still able to produce a considerable number of tillers and vigorous seeds. Itshowed that wild oat possess a notable adaptive plasticity and can allocate a greater proportion of its resource toward reproductiveorgans even under resource shortage conditions and, thus, it may increase the competitive ability of the weedover the crop.Our results suggest that effective weed management should be done to prevent wild oat seed production incrops preceding oilseed rape as well as to control the weed at early season in oilseed rape fields

Effects of different densities of wild oat (Avena fatua L.) and nitrogen rates on oilseed rape (Brassica napus L.) yield