Nitrogen Mineralization and Denitrification in Organic Soils1
- T. F. Guthrie and
- J. M. Duxbury2
The quantities of N mineralized when columns of Histosols were incubated at field capacity for periods up to 28 days corresponded to 500-600 kg N/ha per year without correction for N lost by denitrification.
An absorption train utilizing molecular sieve 5Å to collect N2O was used in denitrification experiments. Under an argon stream, 52-53% of the added NO3--N was recovered as N2O, whereas the maximum concentration of N2O accumulating in the headspace of closed vessels amounted to 65% of the added NO3--N. The quantity of N2O either collected or accumulating in a headspace was reduced to 15-41% of the NO3--N denitrified when a second addition of NO3- was made to the soils. Denitrification occurred in both drained and flooded soil columns amended with NO3-. The N2O recovered ranged from 2.5-9% and 9-19% of the NO3--N denitrified in the drained and flooded columns, respectively. From 78-98% of the N2O was recovered in leachate from the flooded columns and the corresponding range for the drained columns was 11-52%.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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