Effect of different green manure crops and nitrogen sources on grain yield, oil content and some qualitative traits of canola (Brassica napus) var. 401

In order to study the effect of different green manure crops on qualitative and quantitative traits of canola, a field experiment was conducted in experimental farm of Agricultural Faculty of Shahid Chamran University of Ahvaz at 2013-2014 growing season. Experimental design was split plot on randomized complete block design (RCBD) with three replications. In recent research, main plot was different green manure crops including Millet, Barley, mung bean, 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). The result showed that the highest grain yield (4467.2 kg/ha) was related to millet mung bean intercropping 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). The highest grain protein (31.1%) was revealed at mung bean green manure and 100% chemical nitrogen application and the lowest (18.23%) was obtained at fallow and no nitrogen application. The highest oil content(45%) was obtained at millet and no nitrogen application and the highest grain phosphorus(1/04%) was obtained at control treatment(no green manure and nitrogen application) and the highest grain potassium was measured at mung bean green manure and 50% chemical nitrogen biological nitrogen fertilizer (Nitroxin).Overall the results showed that application of green manure plant in rotation programs could be positive from ecological point view that could improve soil physical and chemical properties and other nutrients. Also, the application of biological fertilizer caused to decreased 50% of chemical fertilizer.