Evaluation of efficiency Azotobacter chroococcum and Azospirillum lipoferum of Different Nitrogen Levels on yield and agronomic traits of canola

In order to investigate the effect of nitrogen and bio-fertilizers on canola, an experiment as split-plot was conducted based on randomized complete block design with four replications In Ismaeil-Abad of Qazvin privince. Nitrogen in 3 levels (non application, application of 75 kg.ha N and 150 kg.ha N) as main plots and bio-fertilizer in 4 levels (non inoculation, azotobacter, Azospirillum and azotobacter ̺Ⲧ⫢陛) Omit as subplots were considered. The results showed that nitrogen and bio-fertilizers treatment had a significant effect on plant height. 150 kg of nitrogen was treated as the highest plant height. and Combined use of biological fertilizers also had the highest plant height . Also usage Azospirillum and Azotobacter increases the seed yield. Investigate the interaction of biological fertilizers on yield and nitrogen treatments showed non application nitrogen fertilizer in the highest yield was obtained using a combination of biological mountains. .But in terms of 150 kg nitrogen per hectare, non inoculation had the highest yield. The intact biological fertilizers and biological fertilizers combined with higher grain yield in the treatments in terms of 75 kg per hectare; therefore, half of the recommended nitrogen application of biological fertilizer is suggested.