Abstract
In semi-arid tropics, the desertification results frequently from the degradation of the physical properties of the soils. For sandy soils, usually friable and permeable, this degradation, which consists of the development of hardness and low permeability, was related to the groundmass fabric. Even at low content, the fine clay formed wall-shaped bridges between the skeleton grains and caused a high continuity of the solid phase. This fabric resulted from natural evolution closely related with water dynamics and favoured by lithology and climate. Without necessarily human intervention, the supergeneous materials lost their characteristics of being loose, hydrated and biotic.
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