Question

Water remaining in the soil after a plant has permanently wilted is called

Answer 1

Hi mate, this is your anwer
The wilting point, also called the PERMANENT WILTING POINT, may be defined as the amount of water per unit weight or per unit soil bulk volume in the soil, expressed in percent, that is held so tightly by the soil matrix that roots cannot absorb this water and a plant will wilt.
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Answer 2

Water remaining in the soil after a plant has permanently wilted is known as the "Wilting Point" of that particular soil.

This wilting point is one of the most important physical characteristics of any kind of soil, which is used for harvesting or planting.

If the wilting point goes down,the soil can even permanently loss it's natural turbidity, which is not preferable for any kind of harvesting soil.