Fungicide effect on nitrogenase activity in methylotrophic bacteria.

The study comprised tests on the effect of fungicides: Oxafun T, Funaben T and Baytan Universal on the nitrogenase activity of methylotrophic bacteria, selected from the rhizosphere and non-rhizosphere soil of spring barley. The obtained results indicated that the field dose of fungicides - 0.5 ppm had no effect on all the examined strains of methylotrophic bacteria. The dose of 50 ppm, however, had varied effects, suppressing or stimulating, depending on the particular strain. The highest concentration of fungicides applied, i.e. 100 ppm in all cases suppressed the nitrogenase activity of the strains under examination.