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      Question

      How much boron concentration (mg/kg) is unsafe for plant

      growth?
      A 1.5 mg/kg Correct Answer Incorrect Answer
      B 0.75 -1.5mg/kg Correct Answer Incorrect Answer
      C 0. 7-0.2 5 mg/kg Correct Answer Incorrect Answer
      D >0.5 mg/kg Correct Answer Incorrect Answer

      Solution

      Small amounts of boron (i.e.0.5 mg/l in irrigation water), it may become toxic to plants. Plant tolerance to boron in soils varies widely.

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