effect of different methods of soil fertility increasing via application of organic, chemical and biological fertilizers on grain yield and quality of canola (brassica napus l.)

different resource of fertilizers had an effect on grain yield, oil and grain quality. information regarding the effect of simultaneous application of organic, chemical and biological fertilizers on canola (brassica napus l.) traits is not available. in order to study the effect of different systems of soil fertility on grain yield and quality of canola (talayeh cultivar), an experiment was conducted at experimental farm of agricultural research center of sanandaj, iran, during two growing seasons of 2007-2008 and 2008-2009. the experimental units were arranged as split plots based on randomized complete blocks design with three replications. main plots consisted of five methods for obtaining the basal fertilizers requirement including (n1): farm yard manure; (n2): compost; (n3): chemical fertilizers; (n4): farm yard manure + compost and (n5): farm yard manure + compost + chemical fertilizers; and control (n6). sub plots consisted four levels of biofertilizers were (b1): bacillus lentus and pseudomonas putida; (b2): trichoderma harzianum; (b3): bacillus lentus and pseudomonas putida and trichoderma harzianum; and (b4): control, (without biofertilizers). results showed that basal fertilizers and biofertilizers have a significant effect on grain yield. the highest grain yield was obtained from n5 treatment in which organic and chemical fertilizers were applied simultaneously applied. basal fertilizers, biofertilizers have a significant effect on leaf chlorophyll. the highest nitrogen content (42.85 mg.g-1) and least amount of (n/s) were obtained from n5 treatment. the highest oil percent was obtained from n1 and n2 treatments and highest oil yield was obtained from n5 treatment. finally, application of organic manure and biofertilizers with chemical fertilizer led to an increase in yield and quality of canola grain.