Soil properties in control (NPK) and biochar-treated (BC3N) soils of the Traismauer biochar field trial.

All parameters were measured on composite samples collected in July 2011 from the two treatments (n = 1). n.d. – not determined.
1Soil texture is not shown for biochar treated soils. At high contents humus biases the particle size distribution and is therefore conventionally decomposed by prolonged H2O2 (or similar oxidant) treatment prior to soil texture analysis; biochar/charcoal is largely resistant against this oxidant treatment.