The effect of different green manure crops and nitrogen sources on weed biomass and some growth characteristics of canola

In order to study the effect of different green manure crops and nitrogen sources on some growth characteristics of canola and weed biomass,a field experiment was conducted in experimental farm of Agricultural Faculty of ShahidChamran University of Ahvaz at 2013-2014 growing season. Experimental design was split plot on randomized complete block design (RCBD) with three replications. Main plot was different green manure crops including Millet, Barley, mungbean, intercropping of millet and mung bean and fallow (without green manure application) and subplot were different nitrogen sources at three levels includes (no nitrogen fertilizer(Control),50 % chemical nitrogen + biological nitrogen fertilizer(Nitroxin) and 100 % chemical nitrogen). In order to assessment of canola leaf area index and weed biomass, three sampling date(50,100 and 150 days after sowing) were determined. The result showed that the highest grain yield (4467.2 kg/ha) was related to mungbean and 50 % chemical nitrogen + biological nitrogen fertilizer (Nitroxin) and the lowest (1434.2 kg/ha) was obtained at no nitrogen fertilizer and green manure treatment (control).Also, the highest biological yield (10401/5kg/ha) was revealed at mungbean millet intercropping and 50 % chemical nitrogen + biological nitrogen fertilizer (Nitroxin). The lowest biological yield(3875kg/ha) was obtained at control treatment. control treatment and the highest oil yield (1795/45 kg/ha) was obtained at 50 % chemical nitrogen + biological nitrogen fertilizer (Nitroxin). The 50 % chemical nitrogen + biological nitrogen fertilizer (Nitroxin) and the intercropping of millet and mung bean had the highestyield components. Also the results showed that the highest canola leaf area index(LAI) (4.51) was at 150 days after planting and 50 % chemical nitrogen + biological nitrogen fertilizer (Nitroxin) and the lowest (0/03) was obtained at 150 days after planting and control treatments. The weed results showed that the highest weed biomass (150.33 gr/m2) was obtained at the first sampling date, fallow and no nitrogen application and the lowest(23.34 gr/m2) was related to the third sampling date, The 50 % chemical nitrogen + biological nitrogen fertilizer (Nitroxin) and the intercropping of millet and mung bean. The results of this research showed that the green manure plants with chemical and biological fertilizers caused to canola growth improvement and decreased the weed biomass.Totally the results of this research showed that application of green manure in combination with biological fertilizer and chemical fertilizer could be reduced the chemical fertilizer and also improvement of canola growth , increased in leaf Area Index. it concluded that decreased the weed dry weight.