ISSN:
1432-0789
Keywords:
Key words Thiosulfate
;
Tetrathionate
;
Carbonyl sulfide
;
Carbon disulfide
;
Nitrate
;
Nitrite
;
Nitric oxide
;
Nitrous oxide
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
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 NH and incubated under aerobic conditions. For denitrification, the soils were amended with NO 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 μg S g–1 dry weight) resulted in decreasing rates of NH oxidation to NO; it also resulted in an increasing intermediate accumulation of NO 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 NO reduction, and resulted in an increasing intermediate accumulation of NO 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 NH and NO 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00335927
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