evaluating the effect of some pesodomonas bacteria strains on wheat yield and its components at various levels of phosphorus fertilization

application of biofertilizers, especially plant growth promoting rhizobacteria (pgpr) is one of the most important strategies for plant nutrition compared to chemical fertilizers, especially in sustainable management of agroecosystems. in order to evaluate the effect of pesodomonas bacteria strains and chemical phosphate fertilizer on yield and yield components of wheat the kavir cultivar an experiment was conducted in experimental farm of the agriculture faculty of azad university of damghan. the treatments were arranged as split plots and were evaluated in a complete randomized block design with three replications. the chemical phosphate fertilizer levels of p0 (control), p1 (60 kg/ha), p2 (90 kg/ha), p3 (120 kg/ha) and p4 (150 kg/ha) of super phosphate triple were allocated to the main plots. while the different bacteria strains of pseudomonas putida 21 (s1), pseudomonas putida 158 (s2), pseudomonas fluorescens 168 (s3) and non-inoculation control (s0) were allocated to the sub plots. the results of the experiment indicated that the highest grain yield of 7633 kg/ha was obtained with application of 90 kg/ha of phosphorus fertilizer accompanied with s3 bacteria (strain no.168). the pseudomonas fluorescens168 demonstrated a remarkable efficiency in dry matter and grain production in wheat with no chemical phosphate application.