Previous experiments with artificially compacted mixtures of soils derived from two hori7ans of a mollic luvisol have shown the significmce of air-filled porosity. organic C content and presence of roots for denitrification. To test the validity of these results for natural conditions undisturbed soil cores were taken during tillering from fields cropped to wheat. Denitrification was measured at diffcrcnt constant soil moisture levels. The denitrification rates were in agreement with those found in the earlier experiments. In the light of the new data the previously established regression function parameters were only slightly modified. This confirmed our former findings that the effect of low air-filled porosity and high soil organic C on denitrification was greater in cropped than in uncropped soil.
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