Effect of plant growth promoting bacteria (Azospirillum sp.) On physiology and yield of two oilseed rapes

To evaluate the efficacy of plant growth promoting bacteria (Azospirillum sp.) on canola crop, an experiment (2009-2010) was conducted at Agricultural Research Station of Gorgan. Eight levels of fertilizer treatments (1 - control (no fertilizer and no bacteria), 2 - recommended fertilizer according to soil test(50 kg/h of Urea and triple super phosphate), 3-50 % of recommended fertilizer 4 - Seed inoculation with isolates AZ1, 5 - Seed inoculation with strains AZ10, 6 – combined of 50 % of recommended fertilizer + inoculated seed With strain AZ1, 7 - combined of 50 % of recommended fertilizer +inoculated seed strain AZ10 and 8 – combined of 50 % of recommended fertilizer + inoculated seed with isolates AZ1 and AZ10) with two genotypes of oilseed rapes (Hyola401 and line 6) were combined with factorial arrangement (8×2). The highest grain yield (2892 kg per ha) was observed in recommended fertilizer treatment. There was no significant difference between recommended fertilizer treatment and 50% recommended fertilizer + AZ1 isolate or 50% recommended fertilizer + AZ1 and AZ10 isolates treatments. The results also showed that Azospirillum sps had positive effects on yield and yield components of oilseed rapes.