Potassium (K) fixation capacity is maximum in:____________?
Correct answer: A. Vermiculite
- A. Vermiculite
- B. Illite
- C. Montmorillonitic
- D. Amorphous clay
Explanation
Vermiculite has expandable interlayers that can trap potassium ions, giving it the greatest potassium-fixation capacity among the listed clay minerals. Illite also fixes potassium, but generally less strongly than vermiculite.
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