Denitrification in tillage and no tillage pampean soils: Relationships among soil water, available carbon, and nitrate and nitrous oxide production

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Abstract
The interactions among the denitrification (DN) regulating factors under no tillage (NT) and conventional tillage (CT) during the production of a wheat crop were studied. The usefulness of the water field pore space (WFPS) as an indicator of the magnitude of the nitrous oxide (N2O) losses under the two tillage methods was also analyzed. The N2O production, mineralizable carbon (MC), WFPS, and nitrate (NO3) content were measured in a typic argiudol. The NT system increased N2O losses by DN at the 0–10 cm sampling depth because of its action on the MC and WFPS. Denitrification correlated significantly with the WFPS (r = 0.6, p3 content (r = 0.37, p2O losses, we found that the CT plots had WFPS values 42%. This means that from 42% WFPS, the difference in N2O losses between the two tillage methods were significant in this pampean soils.
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