Abstract
N2O and NO fluxes from grassland soil after the application of cattle and swine excreta were measured by a closed chamber method in the autumn and winter of 1994 to 1995. Fresh excrement and urine were spread on the grassland experimental plots and these gas fluxes were measured one or two times a week. In the autumn experiment, N2O and NO fluxes began to increase several days after the application, the NO flux reaching a maximum after 16 days. In the winter experiment, N2O and NO fluxes began to increase 45 days after the application and reached a maximum after 80 days. Nitrous oxide flux was influenced by soil water content, high water content leading to high N2O flux. The ratio of NO-N/N2O-N in the flux was in the range of 1.1 to 13.7, and negatively correlated to the soil water content. In the winter experiment, the total emission rate of NO was 0.48% and 0.45% of total nitrogen in the applied cattle and swine excreta, respectively. The total emission rate of N2O was 0.085% and 0.098% in the applied cattle and swine excreta, respectively.
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Watanabe, T., Osada, T., Yoh, M. et al. N2O and NO emissions from grassland soils after the application of cattle and swine excreta. Nutrient Cycling in Agroecosystems 49, 35–39 (1997). https://doi.org/10.1023/A:1009794705731
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DOI: https://doi.org/10.1023/A:1009794705731