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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/kg) are essential for plant growth, however, at only slightly higher concentrations (> 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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