<p>Long-term compost addition often increases soil organic carbon (SOC) and improves soil structure, yet its effect on nitrous oxide (N₂O) emissions remains uncertain. This study investigated N₂O emissions from a 13-year compost amendment experiment with 11&#xa0;Mg compost ha⁻¹&#xa0;year⁻¹ on a sandy loam in Belgium. Emissions from a treatment with (Com) and without (NCom) compost addition were monitored over an entire year using static chambers. In year 13 since the start of the experiment, annual N₂O emissions were slightly higher under Com than under NCom (5.361 vs. 4.835&#xa0;kg N₂O-N&#xa0;ha⁻¹), but this difference was not statistically significant. Variation in soil mineral nitrogen content (N_min) and water filled pore space (WFPS) through time strongly shaped the temporal emission pattern. During the potato growing season under a ridge-furrow system, emissions were monitored separately for each of these field positions. Cumulative emissions from both positions did not differ significantly, likely because higher N_min in the ridge was counterbalanced by lower WFPS, while the opposite was observed in the furrow position, showing lower N_min and higher WFPS. Potato yield was not significantly affected by compost application. These findings suggest that long-term compost addition does not substantially increase annual N₂O emissions, and that although ridges and furrows show different N_min and WFPS, these shifts may not translate into significant differences in cumulative N₂O emissions.</p>