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      Question

      Which of the following is an "Indirect" method of ET

      estimation?
      A Lysimeter Correct Answer Incorrect Answer
      B Penman-Monteith Equation Correct Answer Incorrect Answer
      C Field water balance Correct Answer Incorrect Answer
      D Potometer Correct Answer Incorrect Answer

      Solution

      Equations use climatic data (temp, radiation, wind) to calculate ET, whereas Lysimeters physically measure the water lost by a block of soil.

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