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Ammonia and nitrous oxide emissions from a field Ultisol amended with tithonia green manure, urea, and biochar

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Abstract

Short-term mitigation of ammonia (NH3) and nitrous oxide (N2O) emissions by biochar soil amendments has been reported, but limited knowledge of the mechanisms, particularly those associated with long term changes, remain relatively unknown. In order to investigate potential mechanisms and residual effect of biochar on NH3 and N2O emission, a 3-year field trial was set up on an Ultisol in western Kenya with a three-replicate full factorial treatment structure. The factors investigated include the following: biochar (from eucalyptus wood, pyrolyzed at 550 °C, applied once before the start of the experiment at either 0 or 2.5 t ha−1); tithonia green manure applied at the start of each season at either 0, 2.5, or 5.0 t ha−1; mineral nitrogen (N) (as urea applied each season at either 0 or 120 kg N ha−1). NH3 as well as N2O emission and water-filled pore space (WFPS) were monitored throughout the 3 years. In the third year, soil mineral nitrogen (exchangeable NH4+ and NO3−) contents were measured. Biochar reduced cumulative emissions of NH3 and N2O by 47 ± 5 and 22% ± 3, respectively, over the 3 years. Over the 3 years, the effect size of biochar was reduced by 53 and 59% for NH3 and N2O, respectively, indicating that the residual effect of biochar on NH3 and N2O persists at least up to 3 years under field conditions. Tithonia and urea additions increased both gas emissions by 13–68% compared to the control. Combination of the three amendments reduced cumulative NH3 emissions by 18 ± 3%, but had no effect on cumulative N2O. Our results show that biochar can influence emissions of NH3 and N2O longer than most previous studies have reported but is not explained by N dynamics. Other mechanisms such as direct interactions with oxidized biochar surfaces could be more likely to account for the residual effect of biochar on NH3 and N2O in agricultural soils.

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Acknowledgements

Appreciations go to Grace Oluoch, Victor Onyango, Linda Ayieta, and Benson Gudu for the support during data collection in western Kenya. The efforts of Paul Mutuo and Sheila Okooma in analysis of the gas samples in the GC laboratory in Nairobi are valued.

Funding

This study was funded by the National Science Foundation’s Basic Research for Enabling Agricultural Development (BREAD) program, Grant No. IOS-09565336, and jointly administered by Cornell University and the World Agroforestry Center (ICRAF).

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Authors and Affiliations

  1. National Forestry Resources Research Institute (NaFORI), National Agricultural Research Organization (NARO), P.O. Box 1752, Kampala, Uganda

    Bernard Fungo

  2. Institute for Biodiversity and Ecosystem Dynamics (IBED), Faculty of Science, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands

    Bernard Fungo & Karsten Kalbitz

  3. CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), World Agroforestry Center (ICRAF), P.O. Box 30667, United Nations Avenue-Gigiri, Nairobi, Kenya

    Bernard Fungo, Margaret Thionģo, Irene Okeyo & Henry Neufeldt

  4. Department of Crop and Soil Sciences, Cornell University, Bradfield Hall, Ithaca, NY, 14853, USA

    Johannes Lehmann

  5. Soil Resources and Land Use, Institute of Soil Science and Site Ecology, Technische Universität Dresden, Pienner Strasse 19, 01737, Tharandt, Germany

    Karsten Kalbitz

  6. College of Agricultural and Environmental Sciences, Makerere University, P.O. Box 7062, Kampala, Uganda

    Moses Tenywa

  7. UNEP DTU Partnership, Marmorvej 51, 2100, Copenhagen, Denmark

    Henry Neufeldt

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  1. Bernard Fungo
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Fungo, B., Lehmann, J., Kalbitz, K. et al. Ammonia and nitrous oxide emissions from a field Ultisol amended with tithonia green manure, urea, and biochar. Biol Fertil Soils 55, 135–148 (2019). https://doi.org/10.1007/s00374-018-01338-3

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