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FIG. 9. Water tension–saturation relations (imbibitions) for a wettable soil (
= 0) used as reference soil (Ref. soil) to calculate the contact angle (CA) for hydrophobic soils with various contact angles. The 3.1% and 5% are the ratio of mixing of a bulk artificially hydrophobized quartz sand (100% hydrophobic) with a pure wettable quartz sand ( = 0) (Recalculated after data from Bauters et al., 1998). The ORC and EQL soils are naturally occurring hydrophobic sandy soils located under orange orchard and eucalyptus cover, respectively. Ignition of these soils (400 °C for 8 h) was used to establish a completely wettable reference soil (data taken from Arye et al., 2007). (VG function = van Genuchten function.)
