The effect of sodium chlorate and nitrapyrin on the nitrification mediated nitrosation process in soils |
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Authors: | El Sayed Azhar O. Van Cleemput W. Verstraete |
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Affiliation: | (1) Faculty of Agriculture, University of Gent, Coupure L 653, B-9000 Gent, Belgium |
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Abstract: | Summary The influence of total nitrification to nitrate or partial nitrification to nitrite on the soil organic nitrogen status was examined. NH4+–15N was added to the soil in the absence and the presence of NaClO3, respectively nitrapyrin. The first chemical inhibits only nitrate formation, the second inhibits total nitrification. The accumulation of nitrite nitrogen in the soil at levels up to 5 mg kg–1 increased the loss of nitrogen. Yet, it did not increase the binding of mineral nitrogen into soil organic matter, relative to the control soil. The data suggest that the biochemistry of the nitrite formation process, rather than the levels of nitrite ions formed, are of primary importance in the role of nitrification mediated nitrosation of soil organic matter. |
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Keywords: | immobilization labelled fertilizer mineralization mineral nitrogen incorporation %15N atom excess nitrapyrin nitrification NaClO3 |
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