We first define the scientific problems of soil science to show that it cannot progress without a physical and systemic approach to the internal organization of the soil and its functionality with water. We show how the systems approach presented and described by Le Moigne (1994) should be reversed and modified in its application to soil science, descriptive science of the organization of the soil, to allow the development of a physical interaction between water and soil structure. This led us to particularly the exact formulation of thermodynamic state equations of the pedostructure. Thus, is opened the possibility of physical coupling, interdisciplinary, between biological models of the living and the organized soil medium represented by the pedon, its horizons and its pedostructures. Links to spreadsheets for figures referenced in the book (for download) are available at http://wefnexus.tamu.edu/hydrostructural-pedology/ .
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