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Nitrification, ammonia-oxidizing communities, and N2O and CH4 fluxes in an imperfectly drained agricultural field fertilized with coated urea with and without dicyandiamide

Akiyama, Hiroko ; Morimoto, Sho ; Hayatsu, Masahito ; Hayakawa, Atsushi ; Sudo, Shigeto ; Yagi, Kazuyuki

Biology and fertility of soils, 2013-02, Vol.49 (2), p.213-223 [Periódico revisado por pares]

Berlin/Heidelberg: Springer-Verlag

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  • Título:
    Nitrification, ammonia-oxidizing communities, and N2O and CH4 fluxes in an imperfectly drained agricultural field fertilized with coated urea with and without dicyandiamide
  • Autor: Akiyama, Hiroko ; Morimoto, Sho ; Hayatsu, Masahito ; Hayakawa, Atsushi ; Sudo, Shigeto ; Yagi, Kazuyuki
  • Assuntos: Agriculture ; Agronomy. Soil science and plant productions ; Biological and medical sciences ; Biomedical and Life Sciences ; Fertilizers ; Fundamental and applied biological sciences. Psychology ; Life Sciences ; Nitric oxide ; Nitrification ; Original Paper ; Soil mechanics ; Soil science ; Soil Science & Conservation
  • É parte de: Biology and fertility of soils, 2013-02, Vol.49 (2), p.213-223
  • Descrição: Agricultural soil is a major source of nitrous oxide (N 2 O), and the application of nitrogen and soil drainage are important factors affecting N 2 O emissions. This study tested the use of polymer-coated urea (PCU) and polymer-coated urea with the nitrification inhibitor dicyandiamide (PCUD) as potential mitigation options for N 2 O emissions in an imperfectly drained, upland converted paddy field. Fluxes of N 2 O and methane (CH 4 ), ammonia oxidation potential, and ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) abundances were monitored after the application of PCU, PCUD, and urea to upland soil. The results showed that urea application increased the ammonia oxidation potential and AOB and AOA abundances; however, the increase rate of AOB (4.6 times) was much greater than that of AOA (1.8 times). These results suggested that both AOB and AOA contributed to ammonia oxidation after fertilizer application, but the response of AOB was greater than AOA. Although PCU and PCUD had lower ammonia oxidation potential compared to urea treatment, they were not effective in reducing N 2 O emissions. Large episodic N 2 O emissions (up to 1.59 kg N ha −1  day −1 ) were observed following heavy rainfall 2 months after basal fertilizer application. The episodic N 2 O emissions accounted for 55–80 % of total N 2 O emissions over the entire monitoring period. The episodic N 2 O emissions following heavy rainfall would be a major source of N 2 O in poorly drained agricultural fields. Cumulative CH 4 emissions ranged from −0.017 to −0.07 kg CH 4  ha −1 , and fertilizer and nitrification inhibitor application did not affect CH 4 oxidation.
  • Editor: Berlin/Heidelberg: Springer-Verlag
  • Idioma: Inglês
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