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    Question

    Which soil property is typically measured using a

    pressure plate apparatus in order to determine the soil’s moisture retention at permanent wilting point?
    A Field capacity Correct Answer Incorrect Answer
    B Bulk density Correct Answer Incorrect Answer
    C Hygroscopic water Correct Answer Incorrect Answer
    D Permanent wilting point Correct Answer Incorrect Answer
    E Saturation point Correct Answer Incorrect Answer

    Solution

    A pressure plate apparatus applies a specific matric potential to soil samples to determine moisture content at various tensions. At -1500 kPa, the moisture remaining is considered the permanent wilting point, below which plants cannot extract water.

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