Related Topics: [ drainage] The plant (and soil) moisture point below which it cannot extract sufficient water to survive; it will not revive itself even if moisture is supplied to the soil.
refers to the moisture content of the soil at which plants can no longer obtain enough water to meet transpiration requirements.
The moisture content of soil, on an oven-dry basis, at which a plant (specifically a sunflower) wilts so much that it does not recover when
the largest water content in soil at which plants will wilt and not recover when placed in a humid chamber. It is estimated at about -1.5 MPa matric potential.
The moisture content of the soil, expressed as a percentage of the soil volume or as a percentage of dry weight, at the time when the plant will be under stress as a result of the deficiency in the soil moisture.
Permanent wilting point or permanent wilting percentage (PWP) is defined as the soil wetness at which a plant wilts and can no longer recover its turgidity when placed in a saturated atmosphere for 12 hours. The concept was introduced in the early 1910s. Lyman Briggs and Homer LeRoy Shantz (1912) proposed the wilting coefficient, which is defined as the percentage water content of a soil when the plants growing in that soil are first reduced to a wilted condition from which they cannot recover in approximately saturated atmosphere without the addition of water to the soil.