ISSN:
1432-0789
Keywords:
Key words Nitrous oxide flux
;
Inorganic nitrogen concentrations
;
Soil water
;
Wetland rice soil
;
Re-flooding period
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003740000215
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