Fig. 3. Relationship between mean contact angle and mean water drop penetration time (WDPT) values of the 72 samples from the four study plots. The dotted horizontal line denotes the boundary between WDPT values < 5 s (= wettable) and > 5 s (= repellent sensu lato). The dashed vertical line denotes the boundary between contact angles lower than 90° (wettable) and higher than 90° (repellent).