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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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