Influence of crop residue incorporated in the autumn on nitrous oxide emission from the field
2007
Ohashi, Y.(Hokkaido. Central Agricultural Experiment Station, Pippu (Japan)) | Sato, T.
The influences of some crop residue incorporated in the autumn on nitrous oxide (N2O) emissions from the field were investigated. The amounts of cumulative N2O emissions (N2O emissions) from the fields incorporated stem and leaf of corn were more than those from the fields no-incorporated. N2O emissions and N2O concentration in the soil air increased with depth of placement which stem and leaf of corn were incorporated. The residues of three crops (C/N ratio: cabbage 8.9, corn 41.0, and wheat 88.5) were incorporated into the field. N2O emissions from each field were 121.8, 231.6 and 93.3 mgN/square m in cabbage, corn and wheat, respectively. In addition, a linear correlation was found between the C/N ratio and the N2O emissions per dry weight kilogram of each residue. After the cabbages were harvested from the field, the residues chopped were left on the surface (ST), or mixed with soil by rotary (MT). The N2O emissions from ST was lower than those from MT. These results show that crop residue incorporation into the field causes to increase N2O emissions. In addition, it is demonstrated that N2O emissions from the field are greatly affected by the factors such as the depth of incorporation, the kinds of crop residue and the method of application.
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