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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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