Abstract: Observation on N₂O flux in maize field using closed chamber technique shows that maize plant had a significant influence on N₂O emission from maize soil system. The N₂O emission from maize soil was greater than that from soil without maize. In addition, the roots of maize plant could obviously promote N₂O emission from soil, especially in its later growing period. N₂O emission after applying urea was 3.3kg·hm^-2 from sowing to the end of the year, and 0.69kg·hm^-2 of it came from maize plant, which accunted for 17.3% of total N₂O emission.

Key words: Maize plant, N₂O , Emission flux