The following _____ process is not good for agricultural production A: Nitrogen fixation B: Methane production C: Denitrification D: Ammonification

The following ( ) process is<br/>not good for agricultural production. A: Nitrogen fixation B: Methane production C: Denitrification D: Ammonification

In recent years, ( ) produced in the process of soil denitrification has been reported to have greenhouse effect. A: NO B: NO2 C: N2O D: N2