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Biochar, a carbon-rich, porous pyrolysis product of organic residues maypositively affect plant yield and can, owing to its inherent stability,promote soil carbon sequestration when amended to agricultural soils. Anotherpossible effect of biochar is the reduction in emissions of nitrous oxide(N2O). A number of laboratory incubations have shown significantlyreduced N2O emissions from soil when mixed with biochar. Emissionmeasurements under field conditions however are more scarce and show weakeror no reductions, or even increases in N2O emissions. One of thehypothesised mechanisms for reduced N2O emissions from soil is owingto the increase in soil pH following the application of alkaline biochar. Totest the effect of biochar on N2O emissions in a temperate maize croppingsystem, we set up a field trial with a 20t ha−1 biochartreatment, a limestone treatment adjusted to the same pH as the biochartreatment (pH 6.5), and a control treatment without any addition (pH 6.1). An automated staticchamber system measured N2O emissions for each replicate plot (n = 3)every 3.6 h over the course of 8 months. The field was conventionallyfertilised at a rate of 160 kg N ha−1 inthree applications of 40, 80 and 40 kg N ha−1 as ammonium nitrate. Cumulative N2O emissions were 52 % smaller in the biochar comparedto the control treatment. However, the effect of the treatments overall wasnot statistically significant (p = 0.27) because of the large variabilityin the data set. Limed soils emitted similar mean cumulative amounts ofN2O as the control. There is no evidence that reduced N2Oemissions with biochar relative to the control is solely caused by a higher soil pH

Effect of biochar and liming on soil nitrous oxide emissions from a temperate maize cropping system