Denitrification in orthic luvisols with minimum soil treatment
1998
Kralova, M. | Ruzek, P. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
Soil redox intensity effects of denitrification/nitrification on the soil cores of orthic Luvisols were observed. The soil cores were sampled in the arable soil treated by the non-tillage. Variant A was enriched with glucose (5 mg C/100 g dry soil), the variant B with glucose (5 mg C/100 g dry soil) and KNO3 (5 mg NO3-N/100 g dry soil). Amounts of NO3-N, NO2-N, NH4-N, N2O, CO2, extractable Cox, redox potentials and pH showed the low N2O production in the variant A. Limiting factors were a low amount of extractable Cox and a low content of oxygen during 26-day incubation. The variant B enriched with nitrates produced a higher emission of N2O on account of the higher content of nitrates created from the added nitrates as well as from the nitrification process. A content of extractable Cox as well as the amount of oxygen limited the stage of denitrification in the full water saturated soil system. Redox potentials documented very well the alternating denitrification and nitrification processes.
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