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VCS are the soils that have developed under intensive weathering and leaching conditions in tropical and subtropical regions that contain minerals with variable surface charge density, such as kaolinite, gibbsite, goethite, hematite, and amorphous minerals [1, 2]. The charge characteristics of VCS can differ between profile horizons, even within a single soil type. In general, it is found that the surface charge of the topsoil possesses a net negative charge whereas the subsoil may have a net positive surface charge, which is so-called the ‘geric property’ [3].

Surface charge characteristics of a variable charge soil (Rhodic Ferralsols) in the Central Highlands