The effect of seed inoculation with Azotobacter and Azospirillum and application of urban sewage sludge on some of the qualitative and quantitative characteristics of the ( Brassica napus L. )

In order to investigate the effect of Azotobacter, Azospirillum and application of urban sewage sludge on some of the qualitative and quantitative characteristics of the Rapeseed (Brassica napus L.), an experiment was carried out in crop years 2014-2015 and 2015-2016 on the lands of Water and Wastewater Company of southern Tehran (Rey city). This experiment was conducted in a factorial way based on random complete block design with three replications. Experimental factors included, inoculation of rapeseed (Without inoculation, inoculation with Azotobacter choroccocum, inoculation with Azospirillum. Brasilense) and use of sewage sludge recovered: without nitrogen fertilizer and without using sewage sludge, using nitrogen fertilizer, 10, 20 and 30 tons of sewage sludge per hectare.The results indicated that the effect of inoculation and sewage sludge on stem dry weight, biological yield, number of pods per plant, number of seeds in pod, 1000 seed weight, seed yield and acid oleic and linoleic percent was significant at (1% level). The results indicated that the highest oil seed canola was obtained at 10 ton sewage sludge and non-inoculation treatment (38.75 %) and the highest oil yield was obtained at 30 ton sewage sludge and inoculation with Azotobacter treatment with amount of 932.77 kilogram per hectare.The results indicated that the urban sewage sludge application was effective on qualitative and quantitative yield of Brassica napus and inoculation with Azotobacter had better effect than Azospirillum on the traits being investigated such as oil and protein yield.