Moderate
In alkaline soil which form of phosphorus uptake by plants?
Correct answer: B. Secondary orthophosphate
- A. Primary orthophosphate
- B. Secondary orthophosphate
- C. both
- D. None of these
Explanation
In alkaline soil, phosphate exists predominantly as the divalent secondary orthophosphate ion, HPO₄²⁻. In acidic soil, the monovalent primary form H₂PO₄⁻ predominates.
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