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Influence of thiosulfate on nitrification, denitrification, and production of nitric oxide and nitrous oxide in soil

MPS-Authors

Saad,  OALO
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Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

Lehmann,  S
Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Conrad,  R       
Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Citation

Saad, O., Lehmann, S., & Conrad, R. (1996). Influence of thiosulfate on nitrification, denitrification, and production of nitric oxide and nitrous oxide in soil. Biology and Fertility of Soils, 21(3), 152-159. doi:10.1007/BF00335927.


Cite as: https://hdl.handle.net/21.11116/0000-000F-CA9A-0
Abstract
Thiosulfate and CS2 inhibit nitrification. The effect of the addition of thiosulfate on the turnover of inorganic N compounds was tested in an Egyptian and a German arable soil under nitrifying and denitrifying conditions. For nitrification, the soils were amended with and incubated under aerobic conditions. For denitrification, the soils were amended with NH4+ and incubated under anaerobic conditions. For denitrification, the soils were amended with No-3(-) and incubated under anaerobic conditions. In both cases, the thiosulfate decreased with time while tetrathionate accumulated to an intermediate extent. Both compounds disappeared completely after <25 days. Production of CS2 was not observed. Carbonyl sulfide was produced only in the Egyptian soil, but production decreased with increasing amounts of added thiosulfate. Under nitrifying conditions, the addition of increasing amounts of thiosulfate (25, 50, and 100 mu g S g(-1) dry weight) resulted in decreasing rates of NH4+ oxidation to NO3-; it also resulted in an increasing intermediate accumulation of NO2- and NO, and in an increasing production of N2O. Under denitrifying conditions, the addition of increasing amounts of thiosulfate did not significantly affect the rate of NO3- reduction, and resulted in an increasing intermediate accumulation of NO2- and of NO only in the German soil in which the production of N2O was slightly inhibited by thiosulfate. These results demonstrate that the nitrification of NH4+ and NO2- was inhibited by increasing concentrations of thiosulfate and/or tetrathionate without involving the formation of volatile S compounds as potential nitrification inhibitors. Denitrification was not affected by the addition of thiosulfate.