High Application Rates of Biochar to Mitigate N2O Emissions From a N-Fertilized Tropical Soil Under Warming Conditions
Tatiana Rittl, Dener Márcio da Silva Oliveira, Luiza P. Canisares, Edvaldo Sagrilo, Klaus Butterbach‐Bahl, Michael Dannenmann, Carlos Eduardo Pellegrino Cerri
Abstract
Biochar application has been suggested as a strategy to decrease nitrous oxide emissions from agricultural soils while increasing soil C stocks, especially in tropical regions. Climate change, specifically increasing temperatures, will affect soil environmental conditions and thereby directly influence soil N 2 O fluxes. Here, we show that Miscanthus giganteus biochar applied at high rates suppresses the typical warming-induced stimulation of N 2 O emissions. Specifically, in experiments with high biochar addition (25 Mg ha −1 ), N 2 O emissions under 40°C were equal to or even lower compared to those observed at 20°C. In this sense, the mitigation potential of biochar for N 2 O emissions might increase under the auspices of climate change.