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      Question

      In horticultural crops, the "Effective Root Zone" depth

      is critical because:
      A It is where 70% of moisture extraction occurs. Correct Answer Incorrect Answer
      B It is the deepest point a root can reach. Correct Answer Incorrect Answer
      C It is always 1 meter deep for all crops. Correct Answer Incorrect Answer
      D It prevents soil erosion. Correct Answer Incorrect Answer

      Solution

      Most plants extract about 70-80% of their water requirements from the upper quarter of their total root depth. Management focuses on this active zone.

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