The effect of biochar and nitrapyrin (a nitrification inhibitor) applications on nitrous oxide (N2O) emissions from a cropland soil was studied in a 35-day incubation experiment. The biochars were produced using canola (Brassica napus L.) straw under two pyrolysis temperatures: 300 (BC300) and 700 °C (BC700). Biochars (20 g kg−1 soil) and nitrapyrin (80 mg kg−1 soil) were applied alone or in combination. The cumulative N2O emissions were affected by both biochar and nitrapyrin applications (p < 0.05, same below) but not by their interaction. Cumulative N2O emissions were not affected by BC700, but were increased by BC300, as compared with the CK treatment (no biochar addition). Nitrapyrin significantly decreased cumulative N2O emissions by inhibiting nitrification, whether biochar was applied or not. There were positive relationships (p < 0.05) between cumulative N2O emissions and soil microbial biomass carbon to nitrogen ratio, nitrate and dissolved organic nitrogen concentrations, and net nitrification rates. Our results show that biochars need to be appropriately selected (such as the use of BC700) that do not increase N2O emissions, while the effectiveness of nitrapyrin in reducing N2O emissions was not affected by the co-application of biochars. We conclude that the co-application of biochar and nitrapyrin may be able to both increase soil C sequestration by the addition of stable C contained in the biochar and reduce N2O emissions from agricultural production systems.
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We thank Cole Gross, Christopher Nzediegwu, Dauren Kaliaskar, Na Chen, Prem Pokharel, Qian Wu, Yanchen Zhang, and Zilong Ma for their assistance in the laboratory. We also thank the Editor in Chief, the Regional Editor, and two anonymous reviewers for their constructive comments that improved earlier versions of this manuscript.
We thank the China Scholarship Council (CSC) and the Natural Science and Engineering Research Council of Canada (NSERC) for funding. The first author was also supported by a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Li, J., Kwak, JH., Chen, J. et al. Canola straw biochars produced under different pyrolysis temperatures and nitrapyrin independently affected cropland soil nitrous oxide emissions. Biol Fertil Soils 57, 319–328 (2021). https://doi.org/10.1007/s00374-020-01535-z
- Greenhouse gas
- Microbial biomass
- N2O emission
- Nitrification inhibitor