| X1 (HA) | Humus Activ [%] |
| X2 (BEU) | Biohumus Extra Universal [%] |
| σ | Compressive strength [MPa] |
| ρ | Bulk density [kg/dm3] |
| cwi,s | Water absorption [%] |
| SEM | Scanning electron microscope |
| XRD | X-ray crystallography |
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