Ammonia and Nitrous Oxide Emissions after Landspreading of Slurry as Influenced by Application Technique and Dry Matter‐Reduction. II. Short Term Nitrous Oxide Emissions

Strategies reducing NH 3 volatilisation from slurry include separation of slurry, special application techniques and additives. We studied the impact of manure separation and application technique on N 2 O release after manure application. Untreated and separated cattle slurry (dry matter content of 7.1% and 4.4%, respectively) was applied to winter wheat using broadcast and banded application and injection. The N 2 O emissions were measured at high frequency for 14 to 20 days after slurry treatment by the closed chamber method. Manured plots showed significantly higher N 2 O emissions than the control plots but neither dry matter reduction of slurry nor application technique significantly influenced the N 2 O emissions. The variability of N 2 O emission was influenced by the application technique and increased in the order: banded application – injection – broadcast application. There was no correlation between NH 3 losses from applied slurry and N 2 O emissions. Thus reducing ammonia volatilisation will not necessarily increase N 2 O emissions.