Contrasting effects of biochar on N2O emission and N uptake at different N fertilizer levels on a temperate sandy loam

• DOI: 10.1016/j.scitotenv.2016.10.230
• Publication Date: 2016-11-12T05:01:25Z
• Authors: Zhencai Sun; Anja Sänger; Philip Rebensburg; Peter Lentzsch; Stephan Wirth; Martin Kaupenjohann; Andreas Meyer-Aurich
• Keywords: Raphanus; Amendment

Biochar has been frequently suggested as an amendment to improve soil quality and mitigate climate change. To investigate the optimal management of nitrogen (N) fertilization, we examined combined effect biochar N fertilizer on plant uptake N2O emissions in a cereal rotation system randomized two-factorial field experiment sandy loam Brandenburg, Germany. The treatment received 10Mgha-1 wood-derived September 2012. Four levels fertilizer, corresponding 0, 50%, 100%, 130% recommended level, were applied winter wheat (Triticum aestivum L.)) rye (Secale L.) 2013 2014 followed by catch crop oil radish (Raphanus sativus L. var. oleiformis). Biomass significantly affected level but not biochar. For interaction was observed for fertilizer. Without 39% higher found presence biochar, accompanied NH4+ content elevated cumulative CO2 emissions. At 16% lower biochar-mediated treatment. No significant change abundance microbial groups nosZ gene observed. Our results highlight that can have greenhouse gas mitigation at high supply may stimulate nutrient when no is supplied.