Impact of biochar addition to soil on greenhouse gas emissions following pig manure application

► The effect of amending soil with biochar was studied under temperate conditions. ► Greenhouse gas emissions were measured after pig manure application. ► Biochar addition increased N2O emissions in the manure-amended treatments. ► Biochar addition to the soil increased CO2 emissions. ► There was no change in CH4 emissions from the biochar-amended soil.