Effects of crop residue incorporation and properties on combined soil gaseous NO, NO, and NH emissions-A laboratory-based measurement approach.

Crop residues may serve as a significant source of soil emissions of NO and other trace gases. According to the emission factors (EFs) set by the Intergovernmental Panel on Climate Change (IPCC), NO emission is proportional to the amount of N added by residues to the soil. However, the effects of crop residues on the source and sink strength of agroecosystems for trace gases are regulated by their properties, such as the C and N content; C/N ratio; lignin, cellulose, and soluble fractions; and residue humidity.