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A higher genetic potential for N2O emissions was observed under NT than CT, as indicated by an increased (nirK\u00a0+\u00a0nirS)/(nosZI\u00a0+\u00a0nosZII) ratio. The mentioned ratio under NT decreased in the order CON > MIN\u00a0>\u00a0ORG, indicating a higher N2O consumption potential in the NT-ORG treatment, which was confirmed in terms of cumulative emissions. The AOB/16S ratio was strongly affected by fertilisation and was higher in the MIN than in the ORG and CON treatments, regardless of the tillage system. Multiple regression has revealed that this ratio is one of the most important variables explaining cumulative N2O emissions, possibly reflecting the role of bacterial ammonia oxidisers in minerally fertilised soil. 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