Definition:
Soil is a three-dimensional body, occupying the uppermost part of the earth’s crust, having properties that differ from the underlying rock material as a result of interactions between climate, living organisms (including human beings), parent material and relief over periods of time. Distinctions are made between ‘soils’ in terms of differences in internal characteristics and/or in terms of the gradient, slope-complexity, micro-topography and stoniness and rockiness of surface. ‘Soil’ is a narrower concept than ‘land’, soil is one of the attributes of land. Soil contains living matter, air and water and can support vegetation. Also can be referred to as «earth».
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 1, Irrigation Development: a Multifaceted Process, By: Andreas Savva & Karen Frenken