Permanent wilting point

A plant rooted in soil that is beyond the wilting point.

Permanent wilting point (PWP) or wilting point (WP) is defined as the minimal point of soil moisture the plant requires not to wilt. If moisture decreases to this or any lower point a plant wilts and can no longer recover its turgidity when placed in a saturated atmosphere for 12 hours. The physical definition of the wilting point (symbolically expressed as θ_pwp or θ_wp) is defined as the water content at −1500 J/kg (or -15 bar) of suction pressure, or negative hydraulic head.

单词	Permanent wilting point
释义	Permanent wilting point 英语百科 Permanent wilting point Permanent wilting point (PWP) or wilting point (WP) is defined as the minimal point of soil moisture the plant requires not to wilt. If moisture decreases to this or any lower point a plant wilts and can no longer recover its turgidity when placed in a saturated atmosphere for 12 hours. The physical definition of the wilting point (symbolically expressed as θ_pwp or θ_wp) is defined as the water content at −1500 J/kg (or -15 bar) of suction pressure, or negative hydraulic head.
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