Sulfur and nitrogen mineralization in soils compared using two incubation techniques |
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Authors: | DG Maynard JWB Stewart JR Bettany |
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Institution: | Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0 |
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Abstract: | Net mineralization of sulfur and nitrogen was studied in three Canadian Prairie soils using two commonly used incubation methods. In the open system technique, where the soils were leached periodically II.3–11.8 μ g SO2?4 -S g?1 soil was mineralized in 17 weeks. Little mineralization or a net immobilization of sulfur (from 1.4 to 1.3 μ g SO2?4-S g?1 soil) was observed in a closed system where the soils were left undisturbed throughout incubation. Changes in the specific activity of 35S-labelled soil solution sulfate during the closed incubation indicated that mineralization-immobilization processes were occurring simultaneously resulting in minimal net changes in CaCl2-extractable SO2?4 concentrations. The amounts of mineralized nitrogen (32.6–57.8 μg N g?1 soil) were found to be independent of the incubation method employed. |
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