Adsorbed (hygroscopic) water adheres so tightly to soil particles, it can be removed only by oven-drying the soil.
Capillary water coheres to adsorbed water and to itself. Surface tension produces the curved water-air interface. The smaller the radius of the curve, the more tightly the water is held in the pore (i.e., the more negative is the intrinsic potential of the pore).
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