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Question

Available soil water capacity is the moisture held between field capacity and the permanent wilting point. The soil water potential at the permanent wilting point is approximately:

A -0.1 bars Correct Answer Incorrect Answer
B -1 to -2 bars Correct Answer Incorrect Answer
C -5 to -8 bars Correct Answer Incorrect Answer
D -15 to -18 bars Correct Answer Incorrect Answer

Solution

The soil water potential at the permanent wilting point, the soil moisture is held so tightly by the soil particles that it becomes unavailable for plant uptake. Plants wilt because they cannot extract water from the soil at this level of water potential.

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