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The effect on sugar beet yield parameters and microbiological soil status was   studied using two techniques of sugar beet inoculation with strains of   Azotobacter chroococcum. Cultivar “Drena” was used in the study, and field   trial was set under the conditions of organic farming system in Bački   Petrovac. A mixture of three strains of Azotobacter chroococcum was used as   microbial fertilizer. Inoculation was performed by: (A) incorporation of   strains into soil before sowing; and (B) repeated incorporation of strains   into soil two weeks after sowing. PGP characterization of the strains   confirmed the ability of producing indole-3-acetic acid (IAA) from 12.63 μg   ml-1 to 14.95 μg ml-1, nitrogen fixation, and P-solubilization. Positive   effects on the number of azotobacter and free nitrogen fixers in rhizosphere   were obtained by inoculation, as well as positive effects on the tested sugar   beet yield parameters. The largest increase in root yield, yield of crystal   sugar, and yield of polarised sugar compared with the control was obtained by   repeated soil inoculation, ranging from 22 to 23%

The effect of inoculation with Azotobacter chroococcum on microorganisms in rhizosphere and sugar beet yield in organic farming