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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