Nitrification mediated nitrogen immobilization in soils |
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Authors: | Sayed El Azhar O Van Cleemput W Verstraete |
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Institution: | (1) Faculty of Agriculture, University of Gent, Coupure 653, B-9000 Gent, Belgium |
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Abstract: | Summary The influence of nitrification on the status of soil organic nitrogen is examined by applying NH
4
+
-15N to the soil in the absence and the presence of a selective inhibitori.e. nitrapyrin. Parallel with nitrification, formation of organic nitrogen from the added fertilizer was followed. In the soil
examined (pH 6.5, 4% organic carbon),ca. 55% of the fertilizer-N was immobilized during the 60 days incubation period, as a consequence of the nitrification process.
Nitrification not only appeared to contribute to the binding of added mineral nitrogen onto soil organic matter, but also
to re-immobilization of mineralised soil nitrogen. |
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Keywords: | Immobilization Labelled fertilizer Mineralization Mineral nitrogen incorporation %15Natom excess Nitrapyrin Nitrification |
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