Fig. 6. Contact angle (CA) related to (a) A/B* {i.e., A/B ratio in Fourier transform-infrared of soil organic matter with sodium pyrophosphate soluble [SOM(PY)] weighted with SOC/Clay ratio} and (b) A/B*G (i.e., A/B* weighted with the G factor) for soil samples from Chorin, Steigerwald, and Waldstein profiles.