Laboratory study of the emission of NO and N2O from some Belgian soils |
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Authors: | Cornelis-Jan De Groot Annick Vermoesen Oswald Van Cleemput |
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Affiliation: | (1) Faculty Agricultural and Applied Biological Sciences, University of Ghent, Coupure 653, B-9000 Ghent, Belgium |
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Abstract: | The NO, NO2 and N2O emission was measured, upon application of nitrate, ammonium and both, to four Belgian soils with different characteristics. The addition of NH4+caused higher NO and N2O emissions than the addition of no nitrogen, or the addition of NO3–. In contrast to the two soils with a pH of approximately 8 the two soils with a pH around 6 showed a considerable delay in production of both NO and N2O upon the application of the ammonium, probably due to the lag-period of nitrification. The soils with a pH of 8 gave higher emissions on the application of NH4+than the soils with a pH of 6. The emission of NO2 was found to be considerably lower than the NO emission from the soils. The NO/NO2 ratio varied between 5–25 at considerable NO emissions (>50 nmol kg–1). In the controls of soil 1 and soil 2, which showed very low NO emissions ratios of <1 were observed. The N2O/NO ratios varied between 5–20 when NO emissions were considerable (>50 nmol kg–1). Soil 3 and 4 gave lower N2O/NO ratios than soil 1 and 2. In the controls of soil 1 and soil 2, at low NO emissions, N2O/NO ratios of >300 were observed. Soil 3 and 4 gave higher NO/NO2 and lower N2O/NO ratios than soil 1 and 2. |
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