The influence of diesel oil contamination on soil microorganisms and oat growth
Wyszkowska, J. | Kucharski, J. | Waldowska, E. (University of Warmia and Mazury, Olsztyn (Poland))
The effect of diesel oil applied at 0, 2.4, 4.8 and 7.2 ml/kg of soil on yield of oat and number of oligotrophic, eutrophic, nitrogen immobilising, ammonifying and cellulolytic bacteria and Azotobacter sp., actinomyces and fungi was studied in a pot experiment. Inoculation with Streptomyces intermedius spores was used for soil detoxication. The experiment was performed in Eutric Cambisol soil derived from light clay sand. Diesel oil was found to have a negative effect on the growth and development of oat. Inoculation did not attenuate the response of oat to soil contamination with diesel oil, but it had a positive effect on oligotrophic and eutrophic bacteria as well as Azotobacter sp., nitrogen immobilising bacteria and fungi. Regardless of sown and unsown soil and inoculation with S. intermedius spores, diesel oil stimulated the number of oligotrophic, eutrophic, nitrogen immobilising bacteria and actinomyces. Sowing of oat positively affected microbiological properties of soil, because it had a positive influence on the relation of oligotrophic bacteria and actinomyces to fungi. This positive effect, however, was weakened by diesel oil.
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