Biochar and soil nitrous oxide emissions

Resumo

The objective of this work was to evaluate the effect of biochar application on soil nitrous oxide emissions. The experiment was carried out in pots under greenhouse conditions. Four levels of ground commercial charcoal of 2 mm (biochar) were evaluated in a sandy Albaqualf (90% of sand): 0, 3, 6, and Mg ha^-1. All treatments received 100 kg ha^-1 of N as urea. A cubic effect of biochar levels was observed on the N ₂O. Biochar doses above 5 Mg ha^-1 started to mitigate the emissions in the evaluated soil. However, lower doses promote the emissions.