Abstract
N2O emission from a wetland rice soil as affected by the application of three controlled-availability fertilizers (CAFs) and urea was investigated through a pot experiment. N2O fluxes from the N fertilized paddy soil averaged 44.8–69.3 μg N m–2 h–1 during the rice growing season, accounting for 0.28–0.51% of the applied N. The emission primarily occurred during the mid-season aeration (MSA) and the subsequent re-flooding period. Fluxes were highly correlated with the NO3 – and N2O concentrations in the soil water. As there were relatively large amounts of NH4 +-N present in the soil of the CAF treatments at the beginning of MSA, leading to large amounts of NO3 –-N during the MSA and the subsequent re-flooding period, the tested CAFs were not effective in reducing N2O emission from this paddy soil. The potential of applied CAFs to reduce N2O emissions from paddy soil is discussed.
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Received: 25 May 1999
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Yan, X., Du, L., Shi, S. et al. Nitrous oxide emission from wetland rice soil as affected by the application of controlled-availability fertilizers and mid-season aeration. Biol Fertil Soils 32, 60–66 (2000). https://doi.org/10.1007/s003740000215
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DOI: https://doi.org/10.1007/s003740000215