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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 -2 bars Correct Answer Incorrect Answer
    C -15 bars Correct Answer Incorrect Answer
    D -18 bars Correct Answer Incorrect Answer

    Solution

    The soil water potential at the permanent wilting point is -15 bar, 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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