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  • 1
    Electronic Resource
    Electronic Resource
    Laboratory study of the emission of NO and N2O from some Belgian soils (1994)
    Springer
    Environmental monitoring and assessment 31 (1994), S. 183-189 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: 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 NH 4 + caused higher NO and N2O emissions than the addition of no nitrogen, or the addition of NO 3 − . 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 NH 4 + 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547195
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of ammonium and nitrate application on the NO and N2O emission out of different soils (1996)
    Springer
    Plant and soil 181 (1996), S. 153-162 
    Details
    ISSN: 1573-5036
    Keywords: denitrification ; greenhouse gas ; nitric oxide ; nitrification ; nitrous oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of nitrate and ammonium application (0, 50, 100 and 150 mg N kg-1 soil) was studied in an incubation experiment. Four Belgian soils, selected for different soil characteristics, were used. The application of both nitrate and ammonium caused an increase of the NO and N2O emission. The NO production from nitrate and ammonium was found to be of the same order of magnitude. At low pH the NO production was found to be highest from nitrate, at higher pH values the production was found to be higher from ammonium. This seems to be the result of the negative effect of low pH on nitrification. The ANOVA analysis was carried out to separate the effect of the form of nitrogen, quantily of N applied and soil characteristics. The total production of NO was found to depend for 97% on the soil characteristics and for 3% on the quantity of N added. The total N2O production depended for 100% on the soil characteristics. Stepwise regression analysis showed that the total NO production was best predicted by a combination of the factors CaCO3 content and NH4 + concentration in the soil. Total N2O production was best described by a combination of CaCO3, water soluble carbon (WSC) and sand-content. The N2O/NO ratio was found to be highly variable, indicating that their productions react differently to changes in conditions, or are partly independent. It may be concluded that to NO and N2O from soils both nitrification and denitrification may be equally important, their relative importance depending on local conditions such as substrate availability, water content of the soil etc. However, the NO production seems to be more nitrification dependent than the N2O production. ei]{gnE}{fnMerckx}{edSection editor}
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011302
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrous oxide emission out of grassland (1994)
    Springer
    Environmental monitoring and assessment 31 (1994), S. 145-152 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Grazed grassland which received 295 kg ha−1 N-fertilizer (NH4NO3), split-applied, was used to measure nitrous oxide emission. The closed box method was used. At the same time, also soil cores were taken for incubation in the presence of acetylene. During 280 days in 1992, a total emission of 8.4 kg N2O-N ha−1 was found. This was close to 50 % of the total denitrification, which was 18.7 kg (N2O+N2)-N ha−1 over 280 days. A variability study on N2O emission was carried out on a surface of 1, 100 and 10,000 m2, respectively. This study confirmed the lognormal distribution of data with variation coefficients of 20 to 25%. It was also found that the effect of application of 200 kg KNO3-N on N2O emission was limited to 2 weeks upon fertilization. It more than doubled the emission rate during this period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547190
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    Paper (German National Licenses)
    Fulltext
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