Evaluating high biochar incorporation rates on compost performance and downstream potato production.
This technical report evaluates the effects of incorporating high rates of biochar into the composting process and the resulting impacts on compost quality and agricultural performance. Conducted under the Waste to Fuels Technology Partnership 2019–2021 Biennium, the study assessed biochar incorporation at 20% and 40% (v/v) compared to an unamended compost control.
A replicated composting trial examined physical and chemical parameters including bulk density, moisture content, temperature dynamics, and nutrient transformations. Following compost maturation, the resulting products were tested as soil amendments in a potato field experiment to assess agronomic performance.
Results indicate that while biochar incorporation altered certain compost properties, including nutrient status and moisture dynamics, the effects were generally modest. Higher rates showed potential nitrogen retention effects, though these did not consistently translate into significant improvements in crop performance. Findings suggest that biochar feedstock type, production method, and incorporation rate must be carefully matched to intended composting and agronomic goals.
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Authors
Stacey, N., Collins, D., Bary, A., Mhyre, E., and Seefeldt, S.
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Suggested Citation
Stacey, N., Collins, D., Bary, A., Mhyre, E., and Seefeldt, S. 2021. Impact of High Rates of Biochar on the Composting Process and Resulting Products. Waste to Fuels Technology Partnership, 2019–2021 Biennium: Advancing Organics Management in Washington State. Washington State University.
Year Published
2021
Areas of Focus
Agricultural Practices, Climate & Environment, and Value from Waste
Topics
Crops, Production Systems, Soils & Fertility, and Waste Management
