Impact of no-till and reduced tillage on aggregation and aggregate-associated carbon in Northern European agroecosystems

•Aggregate size decreased in the order of NT>RT>CT at all study sites.•Bulk soil SOC did not increase under NT or RT compared to CT in a decade.•NT increased SOC in the mM fraction only on coarse soil.•Lower crop yields under NT most likely cause for limited C sequestration.•Redistribution of SOC to larger aggregates indicates positive impact of NT practice.