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The results clearly showed that both biochar intraporosity (poresinside biochar particles) and interporosity (pore spaces between biochar andsoil particles) are important factors affecting amended soil hydraulic proper-ties. Biochar interpores affected mainly hydraulic conductivity; both interporesand intrapores controlled soil water retention properties. Our results suggestthat for a more effective increase in soil water retention of coarse soils, the useof hydrophilic biochar with high intraporosity is recommended.HighlightsBiochar increases soil water retention and reduces hydraulic conductivity.Hydrophobicity of biochar increased with decreasing particle size.Coarse biochar particles increased soil water retention due to hydrophilicsurfaces and increased intraporosity.

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