"Root zone soil wetness at which the plants can no longer recover turgidity even when they are placed in a saturated atmosphere for 12 hours." (Briggs and Schantz, 1912)
PWP is a plant-related property indicating the lower limit of water availability. It depends on plant properties, soil properties, and meteorological conditions. Generally, PWP is assumed to be the soil water content at a suction of 150 m (1.5MPa, 15 bar). In reality, plant water stress occurs at much lower (more positive) suctions and depends on meteorological conditions.
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