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Some studies are quite skeptical. For example, https://asi.ucdavis.edu/news/new-study-biochar-helps-yields-only-short-term https://asi.ucdavis.edu/news/new-st

Some studies are quite skeptical. For example, https://asi.ucdavis.edu/news/new-study-biochar-helps-yields-only-short-term https://asi.ucdavis.edu/news/new-study-biochar-helps-yields-... https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0075932 https://journals.plos.org/plosone/article?id=10.1371/journal... Some studies even show that biochar soil amendments accelerate the breakdown of humus and release net positive CO2 to the atmosphere: https://onlinelibrary.wiley.com/doi/full/10.1111/gcbb.12376 https://onlinelibrary.wiley.com/doi/full/10.1111/gcbb.12376

hosh 5y ago
> However, soil CO2 fluxes were suppressed when biochar was added to fertilized soils, indicating that biochar application is unlikely to stimulate CO2 fluxes in the agriculture sector, in which N fertilizer inputs are common. > Our results showed that biochar application increased soil CO2 fluxes by 43.33% in unfertilized soils, but decreased by 8.61% in N-fertilized soils, consistent with the meta-analysis of Liu et al. (2016). The metastudy did go into detail about N2O and CH4 as well in both fertilized and unfertilized soil.