Abundance of azotobacter in the soil of natural and artificial grasslands
2018
Andjelković, Snežana | Vasić, Tanja (https://orcid.org/0000-0003-2312-0251) | Radović, Jasmina | Babić, Snežana | Marković, Jordan | Zornić, Vladimir | Djurić, Simonida (https://orcid.org/0000-0002-2347-5530)
Free nitrogen-fixing bacteria of which the most important are the bacteria of the genus Azotobacter, make an important contribution by providing nitrogen to plants and increasing nitrogen content of soil. The presence of azotobacter in soil is a prominent indicator of its biogenity. In this paper, the abundance of azotobacter was assessed in the soil from 10 sites, whereby 5 samples were taken from the natural soil and 5 from artificial grasslands. Studied soil samples were characterized by relatively low pH, so that the abundance of azotobacter was low. It was determined that there was the decrease in the number of azotobacter with increasing acidity of the soil, although the difference is not at the level of statistical significance in all cases. The highest abundance of azotobacter was recorded in the soil from natural grassland, while the lowest (0.125 - log number) was registered in the soil from the planted grassland which pH (KCl) value was 4.16. The results of this study show that the content of organic matter as an energy source for metabolism of microorganisms and chemical properties of the soil, especially the pH of the soil, are limiting factors which influence the abundance and activity of the bacteria of this genus.
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