Summary
Abstract Reducing greenhouse gas emissions from arable soil while maintaining productivity is a major challenge for agriculture. Biochar is known to reduce N 2 O emissions from soil, but the underlying mechanisms are unclear. This study examined the impact of green waste biochar (20 Mg ha −1 ) and lime (CaCO 3 ; 2 Mg ha −1 ) application on soil gas transport properties and related changes in these to soil N 2 O and CO 2 emissions measured using automated chambers in a field experiment cropped with maize. In situ soil water content monitoring was combined with laboratory measurements of relative soil gas diffusion coefficient ( D p / D 0 ) at different matric potentials, to determine changes in D p / D 0 over time. Cumulative N 2 O emissions were similar in the control and lime treatment, b
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