Denitrification in orthic luvisol
1998
Kralova, M. | Ruzek, P. | Krejcova, J. (Vyskumny Ustav Rastlinnej Vyroby, Piestany (Slovak Republic))
Denitrification in orthic Luvisols was observed in laboratory soil experiments of three water saturation levels (100, 200, and 300 % water-filled pore space - WFPS). KNO3 (5 mg NO3-N in 100 g soil) and glucose (5 mg C in 100 g soil) were added and the 5-day incubation prolonged the experiment. The reduction of nitrates and the production of N2O showed the direct relationship with WFPS and the content of extractable Cox. One set of every variant was inhibited by acetylene to depress the N2O-reductase activity. The nitrate reduction and N2O production slowed down (18 and 5 %) in the variant A of 100 % WFPS. The values of Eh (redox potential) reached 400 to 300 mV at pH 6 to 8. The amount of extractable Cox was consumed in 80 to 90 %. The reduction of nitrates (50 to 60 %) and N2O emissions (10 to 12 %) increased with increasing WFPS (200 to 300 %). Eh was 200 to 180 mV. The CO2 production was adequate. The acetylene inhibition was convenient.
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