Effect of Azotobacter croococcum [i.e. chroococcum] on productive traits and microorganisms in sugar beet rhizosphere | Uticaj primene Azotobacter chroococcum na proizvodne osobine i mikroorganizme u rizosferi šećerne repe
2011
Kuzevski, J., Institut za primenu nauke u poljoprivredi, Beograd (Serbia) | Mrkovački, N., Institut za ratarstvo i povrtarstvo, Novi Sad (Serbia) | Čačić, N., Institut za ratarstvo i povrtarstvo, Novi Sad (Serbia) | Bjelić, D., Institut za ratarstvo i povrtarstvo, Novi Sad (Serbia) | Marinković, J., Institut za ratarstvo i povrtarstvo, Novi Sad (Serbia) | Filipović, V., PDS Institut Tamiš, Pančevo (Serbia)
The aim of this study was to determine the effects of three different inoculation methods with selected Azotobacter chroococcum strains on productive and technological traits of sugar beet, as well as on the total number of microorganisms and azotobacter in rhizosphere. The results of this two-year study showed that effectiveness of the tested inoculation methods in increasing root yield and sugar content varies greatly, depending on year and azotobacter strains. Effectiveness of inoculation methods was not largely impacted by year on granulated sugar. Achieved granulated sugar yield was significantly higher by using pre-sowing azotobacter application, than by using seed inoculation. A significantly increased number of microorganisms in sugar beet rhizosphere was determined, not only by using pre-sowing azotobacter application but also by using sugar beet seed inoculation. Pre-sowing azotobacter application and inter-row cultivation both caused an equal increase in the number of these bacteria in sugar beet rhizosphere (42.2% and 46.9%). Use of sugar beet seed inoculation caused an increase of 33.7% in the number of azotobacter. In order to achieve higher effectiveness in applying azotobacter on productive and technological traits of sugar beet, and considering determined interaction between a certain year, an inoculation method and a strain, it is necessary for future research to focus on determining efficiency of these strains when they are in a mixture.
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