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Evaluation of Biochar Addition to Digestate, Slurry, and Manure for Mitigating Carbon Emissions

Author

Listed:
  • Leonardo Verdi

    (Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale delle Cascine, 18, 50144 Florence, Italy)

  • Anna Dalla Marta

    (Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale delle Cascine, 18, 50144 Florence, Italy)

  • Simone Orlandini

    (Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale delle Cascine, 18, 50144 Florence, Italy)

  • Anita Maienza

    (Institute of BioEconomy (IBE), National Research Council (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019 Florence, Italy)

  • Silvia Baronti

    (Institute of BioEconomy (IBE), National Research Council (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019 Florence, Italy)

  • Francesco Primo Vaccari

    (Institute of BioEconomy (IBE), National Research Council (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019 Florence, Italy)

Abstract

The contribution of animal waste storage on GHG emissions and climate change is a serious issue for agriculture. The carbon emissions that are generated from barns represent a relevant source of emissions that negatively affect the environmental performance measures of livestock production. In this experiment, CO 2 and CH 4 emissions from different animal wastes, namely, digestate, slurry, and manure, were evaluated both in their original form and with a biochar addition. The emissions were monitored using the static camber methodology and a portable gas analyzer for a 21-day period. The addition of biochar (at a ratio of 2:1 between the substrates and biochar) significantly reduced the emissions of both gases compared to the untreated substrates. Slurry exhibited higher emissions due to its elevated gas emission tendency. The biochar addition reduced CO 2 and CH 4 emissions by 26% and 21%, respectively, from the slurry. The main effect of the biochar addition was on the digestate, where the emissions decreased by 45% for CO 2 and 78% for CH 4 . Despite a lower tendency to emit carbon-based gases of manure, biochar addition still caused relevant decreases in CO 2 (40%) and CH 4 (81%) emissions. Biochar reduced the environmental impacts of all treatments, with a GWP reduction of 55% for the digestate, 22% for the slurry, and 44% for the manure.

Suggested Citation

  • Leonardo Verdi & Anna Dalla Marta & Simone Orlandini & Anita Maienza & Silvia Baronti & Francesco Primo Vaccari, 2024. "Evaluation of Biochar Addition to Digestate, Slurry, and Manure for Mitigating Carbon Emissions," Agriculture, MDPI, vol. 14(1), pages 1-12, January.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:1:p:162-:d:1324311
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    References listed on IDEAS

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    1. Wang, Guangshuai & Liang, Yueping & Zhang, Qian & Jha, Shiva K. & Gao, Yang & Shen, Xiaojun & Sun, Jingsheng & Duan, Aiwang, 2016. "Mitigated CH4 and N2O emissions and improved irrigation water use efficiency in winter wheat field with surface drip irrigation in the North China Plain," Agricultural Water Management, Elsevier, vol. 163(C), pages 403-407.
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