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Nitrogen Mineralization and Denitrification in Organic Soils¹

ABSTRACT

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%.

¹ Cornell University, Department of Agronomy, Paper no. 1243.

² Former Graduate Research Assistant and Associate Professor of Soil Organic Chemistry, respectively, Cornell Univ., Ithaca, NY 14853.

Received for publication March 21, 1978. Accepted for publication August 9, 1978.

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