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Impacts of Biochar Additions on Agronomic Yields  

Kurt Spokas USDA-ARS, Soil and Water Management Unit, St. Paul, MN Adjunct Professor University of Minnesota – Department of Soil, Water and Climate. Impacts of Biochar Additions on Agronomic Yields  . Illinois Biochar Group Meeting ISTC June 9, 2011. Biochar: Soil Application.

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Impacts of Biochar Additions on Agronomic Yields  

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  1. Kurt Spokas USDA-ARS, Soil and Water Management Unit, St. Paul, MN Adjunct Professor University of Minnesota – Department of Soil, Water and Climate Impacts of Biochar Additions on Agronomic Yields   Illinois Biochar Group Meeting ISTC June 9, 2011

  2. Biochar: Soil Application • The assumed target for biochar has been soil application • Focus has been on “creating” Terra Preta soils Observations of increased soil fertility and productivity. Postulated from ‘slash and burn’ historic charcoal additions

  3. Biochar: Soil Application • However, on the other side: • Wood distillation plants[1800-1950’s] • Wood pyrolysis – source of chemicals and energy prior to petroleum (fossil fuel) • Multiple large plants existed (10 cords [14 tons] per day) • Some plants on US-EPA Superfund site list • Other charcoal sites • Not always productive • Reduced seed germination • Reduced plant growth (BEGLINGER AND LOCKE, 1957)

  4. Soil Application… Long History • Applications date back to the beginning of modern science [1800’s]: (LeFroy, 1883)

  5. Biochar Soil Application • Does biochar improve agronomic yields?

  6. Biochar Soil Application • Recent compilation of historical and recent biochar (black carbon) applications: • 50% positive, • 30% no effect, and • 20% negative impacts on growth and/or yield • (Spokas et al., 2011) • However, should not be used as a basis for forecasting outcomesPublication bias • (Møller and Jennions, 2001)

  7. Further Observations from Existing Studies • Wood Feedstock – • Majority of observed positive yield improvements have used wood feedstock with traditional soil kiln/fire pit methods (not pyrolysis units) • Other feedstocks: • negative to no impact… • Exception:Poultry manure (higher N-content)

  8. Significant Hurdles • Lack of adequate documentation of biochar properties and conditions in existing studies • Existing feeling that biochar = biochar • Once produced – Biochar is reactive • Surface chemistry is not only a function of production and feedstock, but also of post-production conditions and storage (i.e. cooling method, activation) • Biochars with equivalent production conditions still can be chemically and structurally different

  9. Sorbed Organics on Oak Biochar Slow pyrolysis Equivalent production conditions Slow pyrolysis Fast pyrolysis Gasifier pyrolysis Soil kiln mound (traditional)

  10. Active Biochar Research • MN Corn Growers Association • > Examining the potential use of microwave assisted pyrolysis in the conversion of distillers grain into value added products (energy, bio-oil and biochar) • MN Dept. of Agriculture (Specialty Crop Block Grant) • > Impacts of biochar on specialty crop production • - Soil and yield impacts • - Potential bioaccumulation of other organic compounds on biochar • USDA-ARS • > Rosemount, MN Field Plots – 8 different biochars & biomass • > Laboratory assessments of GHG and VOC impacts

  11. Conclusions Despite the long research history – No absolute “biochar” consistent trends Highly variable material – Production & post-production handling Different responses to biochar Function of soil ecosystem (microbial linkage) & position on black carbon continuum Importance of fully documenting methods of creation, handling, and properties – Allow future elucidation of factors Several inter-related mechanisms Biochar does act as a carbon sequestration agent As long as biochar has low oxygen to carbon (O:C) molar ratio

  12. Looking Forward Economics caused the shift from biomass to fossil fuels in the early 1920’s: We at the cusp where environmental stewardship is returning the pendulum back to biomass as the source for human’s energy, chemical and agronomic needs Research is needed to optimize both: Advanced pyrolysis system development for combined energy, chemical, and biochar production Subsequent utilization of biochar in a sustainable and environmentally responsible manner [not limited solely to soil application]

  13. American Society of Agronomy Biochar Community

  14. Acknowledgements I would like to acknowledge the cooperation: National Council for Air and Stream Improvement (NCASI) Universität Bonn (Germany) IRNASE-CSIC (Spain) Università di Bologna (Italy) Penn State; University of Minnesota Illinois Sustainable Technology Center (ISTC) [Univ. of Illinois] US-EPA and other USDA-ARS locations Dynamotive Energy Systems NC Farm Center for Innovation and Sustainability Best Energies Northern Tilth Minnesota Biomass Exchange Biochar Brokers Chip Energy AECOM Avello Bioenergy ICM, Inc. Freedom Field Energy Partial Funding: Minnesota Corn Growers Association/Minnesota Corn Research Production Council Minnesota Department of Agriculture Specialty Crop Block Grant Program Technical Support : Martin duSaire Students: Tia Phan, Lindsey Watson, Lianne Endo, Kia Yang, Eric Nooker, Ed Colosky and Amanda Bidwell

  15. USDA-ARS Biochar and Pyrolysis Initiative Multi-location USDA-ARS research efforts: GRACEnet Project (30 locations): Greenhouse Gas Reduction and Carbon Enhancement Network REAP Project (24 locations): Renewable Energy Assessment Project Biochar and Pyrolysis Initiative (15 locations) Ongoing field plot trial (6 locations)

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