The indicator used for estimation of the soil available boron is_______?
Correct answer: B. Azomethine-H
- A. Mixed indicator
- B. Azomethine-H
- C. Diphenyle
- D. Phenolpthalein
Explanation
Azomethine-H forms a measurable coloured complex with boron and is therefore widely used to estimate available soil boron. Phenolphthalein and diphenyl indicators are not the standard boron reagent.
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