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      Question

      "Border Strip" irrigation is most efficient

      on:
      A Steep hills Correct Answer Incorrect Answer
      B Level to gently sloping lands Correct Answer Incorrect Answer
      C Very sandy soils Correct Answer Incorrect Answer
      D Rock surfaces Correct Answer Incorrect Answer

      Solution

      Water flows as a thin sheet down a long strip. If the slope is too steep, it causes erosion; if too flat, water won't advance.

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