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  • 1
    Electronic Resource
    Electronic Resource
    Rate of accumulation and emission of N2, N2O and CH4 from a flooded rice soil (1990)
    Springer
    Plant and soil 129 (1990), S. 269-276 
    Details
    ISSN: 1573-5036
    Keywords: CH4 emissions ; denitrification ; gas entrapment ; rice soils ; stable N isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a field experiment using microplots, a flooded Crowley silt loam (Typic Albaqualfs) rice soil was fertilized with 15N labelled (60–74 atom %) urea and KNO3. Emission of N2, N2O and CH4 and accumulation in soil were measured for 21 d after fertilizer application. Emission of 15N2-N measured from the urea and KNO3 treated plots ranged from 〈15 to 570 and from 330 to 3,420 g ha−1 d−1, respectively. Entrapped 15N2-N in the urea treated microplots was significantly lower (〈15 g to 2.1 kg ha−1) on all sampling dates compared to the 15N2-N gas accumulation in the KNO3 treated plots (6.4 to 31.5 kg ha−1). Emissions of N2O-N were low and did not exceed 4 g ha−1 d−1. Fluxes of CH4 from the fertilizer and control plots were low and never exceeded 33 g ha−1 d−1. Maximum accumulation of CH4 in the flooded soil measured 460 and 195 g ha−1 for the urea and KNO3 treatments, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032422
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  • 2
    Electronic Resource
    Electronic Resource
    Removal of floodwater nitrogen in a cypress swamp receiving primary wastewater effluent (1987)
    Springer
    Hydrobiologia 153 (1987), S. 79-86 
    Details
    ISSN: 1573-5117
    Keywords: N removal ; wetlands ; sediment ; primary sewage ; nitrification ; denitrification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intact sediment-water columns from a flowing cypress swamp receiving primary wastewater effluent were used to evaluate inorganic N removal and to determine the fate of 15NH inf4 sup+ -N added to the floodwater. Treatments represented wetland sites which had received 0 (initial application), 2, and 50 years of primary wastewater application. The rate of inorganic-N decrease in the floodwater was greatest for the initial application columns, primarily due to sediment adsorption of NH inf4 sup+ , followed by 2-year and 50-yr-columns. Maximum removal rates were 318, 296, and 148 mg N m−2 day−1, respectively. At the end of the 21-day study period, only 0.5 to 2.3% of applied 15N was recovered in the floodwater and 11.4 to 17.3% was recovered in the sediment, with the remaining 82.2 to 86.3% being lost from the sediment-water system. Results of the study indicated that N removal efficiency did not decrease with prolonged wastewater application, despite reduced sediment adsorption capacity, because of the significance of gaseous N losses (nitrification-denitrification, NH3 volatilization) as an N sink in the sediment-water system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005506
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