Successive soil treatment with captan or oxytetracycline affects non-target microorganisms |
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Authors: | Z Piotrowska-Seget R Engel E Nowak Jacek Kozdrój |
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Institution: | (1) Departament of Microbiology, University of Silesia, Jagiellońska 28, 40-032 Katowice, Poland;(2) Forschungszentrum Borstel, Strukturbiochemie, Parkallee 22, 23845 Borstel, Germany;(3) Institute of Ecology, Polish Academy of Sciences, Konopnickiej 1, Dziekanów Leśny, 05-150 Lomianki, Poland;(4) Institute of Engineering and Environmental Protection, University of Bielsko-Biała, Plac fabryczny 5, 43-300 Bielsko-Biala, Poland |
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Abstract: | Changes in microbial biomass and activity were determined in a sandy-loam soil treated with successive dosages of oxytetracycline
(a bactericide) or captan (a fungicide) throughout 98 days of incubation under laboratory conditions. The numbers of culturable
bacteria and fungi, total bacterial and fungal biomass (as amounts of phospholipid fatty acids, PLFA), the fungal/bacterial
ratio, activities of acid and alkaline phosphatases and urease as well as concentrations of N-NH4
+ and N-NO3
− were assessed. Both oxytetracycline and captan significantly decreased numbers of culturable bacteria whereas total bacterial
biomass (bactPLFA) was not affected. Oxytetracycline did not effect on the fungal biomass, however their numbers were reduced
after the first and second time of soil amendment with the bactericide. Conversely, fungal numbers and biomass (PLFA 18:2ω6,9)
significantly decreased in response to soil treatment with the fungicide. Compared to oxytetracycline, captan significantly
decreased activities of acid and alkaline phosphatases. For urease activity, the decreased activity was only observed in the
soil after the third dosage of captan. Both biocides significantly increased concentrations of N-NH4
+ and decreased concentrations of N-NO3
− after the soil treatments. The results of this study indicate that successive soil treatment with oxytetracycline or captan
dosages may negatively affect non-target soil microorganisms and their activities. |
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Keywords: | Biocides Microbial biomass Enzyme activities Available nitrogen Soil treatment |
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