Dataset on physicochemical and structural properties of degraded soils amended with digestate-derived biochard soils of contrasting texture

The deposited dataset was collected as part of the research project “Wpływ biowęgla wzbogaconego mikrobiologicznie na właściwości fizykochemiczne i biologiczne agregatów glebowych – badania modelowe” (“The influence of microbiologically enriched biochars on the physicochemical and biological properties of soil aggregates – model studies”), funded by the National Science Centre, Poland, under the SONATA 17 programme (project no. 2021/43/D/ST10/01656).The project is based on model aggregates prepared from biochar and biochar enriched with microorganisms (Trichoderma), mixed with soils of different texture classes and physicochemical characteristics. The research covers bulk density, aggregate structure and pore characteristics, water and mechanical stability of aggregates, wettability, microbial activity, as well as a range of other physicochemical and biological parameters.The study was carried out between August 2024 and May 2025 at the Institute of Agrophysics, Polish Academy of Sciences, in Lublin.The dataset contains results for two degraded soils, biochars produced from post-fermentation sludge at different pyrolysis temperatures, and mixtures of soils with biochar at various proportions. The dataset includes water vapor desorption isotherms, biochar ash content, bulk density, intrusion curves, particle size distribution, biochar pH, pore size distribution functions, specific surface area, tensile strength, total pore volume, total porosity, average pore diameter, and correlation matrices between variables.The dataset consists of the following xlsx. files:A_1 – Water vapor desorption isotherms for soils (Brunic Arenosol (BA), Haplic Chernozem (HC)) and soils- biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_2 – Ash content of biochars produced from post-fermentation sludge at three temperatures (300, 450, 600 °C).A_3 – Bulk density (BD) for soils (BA, HC), biochars (300, 450, 600 °C), and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_4 – Intrusion curves for soils (BA, HC) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_5 – Particle size distribution for soils (BA, HC) and biochars (300, 450, 600 °C).A_6 – pH of biochars (300, 450, 600 °C).A_7 – Pore size distribution functions for soils (BA, HC) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_8 – Specific surface area (SSA) derived from water desorption isotherms for soils (BA, HC), biochars (300, 450, 600 °C) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_9 – Tensile strength (σ) for soils (BA, HC), biochars (300, 450, 600 °C) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_10 – Total pore volume (V) for soils (BA, HC), biochars (300, 450, 600 °C) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_11 – Total porosity (Pc) for soils (BA, HC), biochars (300, 450, 600 °C) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_12 – Average pore diameter (Dav) for soils (BA, HC), biochars (300, 450, 600 °C) and soil–biochar mixtures at different proportions (0.2, 0.5, 1, 1.5, 3, 5%).A_13 – Correlation matrices between the variables obtained for BA soil.A_14 – Correlation matrices between the variables obtained for HC soil.Summary of methods and equipment used:A_1, A_8: Vacuum Dryer OV-12 (Jeio Tech, Republic of Korea); Vacuum Dryer DZ-2BC (Chemland, Poland).A_1, A_2, A_3, A_8: EXPLORER® ANALYTICAL EX324M balance (OHAUS, Parsippany, NJ, USA).A_2: Muffle furnace FCF 12 SP (Czylok, Poland).A_4, A_7, A_10, A_11, A_12: Autopore IV 9500 porosimeter (Micromeritics, Norcross, GA, USA).A_5: Mastersizer 3000 laser diffraction analyzer (Malvern, UK).A_6: CX-505 digital pH meter (Elmetron, Poland).A_9: Electronic Testing Machine LabTest 6.10.1 (LABORTECH s.r.o., Opava, Czech Republic).A_13, A_14: STATISTICA 13.3 software (TIBCO Software Inc., USA)