The objective of this work was to compare nitrous oxide (N2O) emissions to the atmosphere with pig slurry application on soil under no-tillage (NT) and minimum tillage (MT). The experimental design was set as a completely randomized design with five replications. The treatments consisted of the application (40 m³ ha-1), or not, of pig slurry in NT and MT. The N2O emissions were measured in situ, after the slurry application, for 28 days. The N2O flux increased with the application of slurry and, only in 20% of the evaluations, they were greater in NT. Nitrous oxide emissions were related to the increase of the water-filled pore space. Amounts of N-N2O emitted in 28 days represented 0.20 and 0.25% of total N applied with slurry for NT and MT, respectively. Results work show that pig slurry application in NT does not increase the accumulated N2O emission in relation to application in MT.
nitrous oxide; minimum tillage; crop residues; denitrification
