Soil denitrification was studied in wheat-maize rotation cropping system on an aquic cambisol. Results showed that the Nloss amount by denitrification ranged from 4.7 to 9.7 kg per hectare with different levels of nitrogen application and the keystage for denitification was during summer maize-growth-period, especially within 1-2 weeks after fertilizer nitrogen wasapplied. Similar trend was found between soil N2O production/emission dynamic and denitrification dynamic in therotation system, which may indicate that mainly N2O is produced in nitrification process.
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