In this study, application of different bacterial strains obtained from different ecosystems of Turkey with increasing doses of chemical fertilizers (NPK) was repeated for two years in field conditions in order to determine the effects on plant growth, yield and quality in cauliflower. Six PGPR strains (SA7, SB39, YÖ19, YÖ15, YÖ,41, SK72 107cfu/ml) from the trial subjects and a control group were added. Fertilizer applications were determined over the recommended dose; The rates of 0% NPK0, 50% NPK, 100% NPK and 200% NPK were applied. In the study, crown length, crown diameter, crown weight, leaf length, leaf diameter and marketable yield values were measured in sample plants selected on the basis of plots. Marketable yield values for 2021; NPK0 dose YÖ41, YÖ15 (2.55 ton ha^-1), 1/4NPK dose YÖ41 (2.98 ton ha^-1), 1/2NPK dose YÖ41, YÖ15 (4.57 ton ha^-1), NPK dose YÖ41 (4.74 ton ha^-1), 2NPK dose It was determined as YÖ41 (4.69 ton ha^-1). Marketable yield values for 2022; NPK0 dose YÖ41 (2.16 ton ha^-1), 1/4NPK dose SA7 (3.26 ton ha^-1), 1/2NPK dose YÖ41 (4.73 ton ha^-1), NPK dose YÖ41 (5.03 ton ha^-1), 2NPK dose YÖ41 (5.11 ton ha^-1) was determined. As a result of the research, it was determined that the effects of bacterial applications on the growth of the cauliflower plant are important. When the effects of applied bacterial strains on plant growth were examined, YÖ41, YÖ15 bacterial strains came to the fore, while other bacterial strains had a positive effect on all parameters.