_________is probably the most important growth limiting factor in acid soils especially those having pH below 5.0-5.5?
Correct answer: C. Aluminium
- A. Nitrogen
- B. Potassium
- C. Aluminium
- D. Calcium
Explanation
At very low pH, aluminium becomes soluble and toxic to roots, making it a major growth-limiting factor in acid soils. Nitrogen, potassium and calcium can be deficient, but aluminium toxicity is the characteristic constraint asked here.
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