The potential value of biochar in the mitigation of gaseous emission of nitrogen

Ramya Thangarajan, Nanthi S. Bolan, Anitha Kunhikrishnan, Hasintha Wijesekara, Yilu Xu, Daniel C.W. Tsang, Hocheol Song, Yong Sik Ok, Deyi Hou

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Nitrogen (N) losses through gaseous emission of ammonia (NH3) and nitrous oxide (N2O) can contribute to both economic loss and environmental degradation. This study examined the effect of biochar and a chemical nitrification inhibitor, dicyandiamide (DCD), on N transformation and N losses via gaseous emission of NH3 and N2O from agricultural soils treated with a range of organic and inorganic N sources. The addition of DCD reduced N2O emission from both organic and inorganic N sources treated soils by 75%, but increased ammonium (NH4 +) concentration and subsequently induced high NH3 emission from the soils. In contrast, the addition of biochar reduced both N2O and NH3 emissions from organic and inorganic N sources treated soils by 23% and 43%, respectively. The effectiveness of biochar and DCD in reducing NH3 volatilization and N2O emission depends on the nature of the N sources and their initial mineral N concentration. The study demonstrated that biochar can be used to mitigate N losses resulting from NH3 volatilization and N2O emission.

Original languageEnglish
Pages (from-to)257-268
Number of pages12
JournalScience of the Total Environment
Volume612
DOIs
Publication statusPublished - 2018 Jan 15

Keywords

  • Biochar
  • Gaseous emission
  • Nitrification inhibitors
  • Nitrogen transformations
  • Soil organic amendments

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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