BOOK OF ABSTRACTS 201 IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 Hall A Poster Session / Soil Organic Matter, Caustobiolites, and Biochar the small and medium sized pores most likely due to the loss of ions during the washing process. On the other hand, plant incubation appears to decrease the contribution of larger pores, likely through clogging them by organic matter and root exudates. These observations still need to be confirmed through a more detailed analysis of the full samples set but the preliminary results are promising. Acknowledgement The IHSS is thanked for providing a training award, which enabled the first author to perform the research visit at the Embrapa Solos. Embrapa Solos is thanked for hosting him and providing the facilities. Carbon Capital (Namibia) and the Gruppo Caviro (Italy) are acknowledged for providing the biochars from bush harvest and vineyard pruning respectively.
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