To define FC we consider the following. In many soils, after a rain or
irrigation, the water immediately starts draining deeper into the soil.
After 1 or 2 days the water content in the soil will reach, with time, for
many soils, a nearly constant value for a particular depth in question. This
somewhat arbitrary value of water content, expressed as a percentage, is
called the field capacity (http://dx.doi.org/10.1016/B978-0-12-420022-7.00010-0).
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