Abstract
Changes in microbiological properties of a sandy loam soil in response to the addition of different concentrations of fungicide tebuconazole and pyrethroid insecticide λ-cyhalothrin were assessed under laboratory conditions. To ascertain these changes, the potentially active soil microbial biomass, concentrations of ammonium and nitrate ions, numbers of total culturable bacteria, fungi, nitrogen-fixing bacteria, nitrifying and denitrifying bacteria were determined. Substrate-induced respiration (SIR) increased with time in both control (ranged from 13.7 to 23.7 mg/O2/kg−1/dry soil/h−1) and pesticide treated soil portions. For both pesticides, SIR values ranged from 12–13 to 23–25 mg/O2/kg−1/dry soil/h−1 on days 1 and 28, respectively. Also, concentrations of nitrate and ammonium ions, numbers of total culturable bacteria, denitrifying bacteria, nitrogen-fixing bacteria (for the insecticide) and fungi (for the insecticide) were either unaffected or even stimulated by the pesticide treatments. The adverse impacts of the pesticides were observed for nitrate concentrations (on days 1 or 7), numbers of nitrifying bacteria (on day 1), denitrifying bacteria (for the insecticide on days 1 and 14), nitrogen-fixing bacteria (for tebuconazole on day 1) as well as numbers of fungi in tebuconazole-treated soil (on days 1 and 14).
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We are grateful to Maria Siuta for laboratory assistance and Polish State Committee for Scientific Research for supporting this research.
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Cycoń, M., Piotrowska-Seget, Z., Kaczyńska, A. et al. Microbiological characteristics of a sandy loam soil exposed to tebuconazole and λ-cyhalothrin under laboratory conditions. Ecotoxicology 15, 639–646 (2006). https://doi.org/10.1007/s10646-006-0099-8
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DOI: https://doi.org/10.1007/s10646-006-0099-8