Question

The different pools of potassium in soils are
(A) Soil solution K
(B) Fixed K
(C) Exchangeable K
(D) Lattice K

• A. (A), (B) and (D) only
• B. (A), (B) and (C) only
• C. (A), (B), (C) and (D)
• D. (B), (C) and (D) only

Hint:

All four forms—solution, exchangeable, fixed, and lattice—represent different potassium availability levels.

Answer 1

The Correct Option is C

Step 1: Solution K and exchangeable K are readily available and in quick equilibrium.
Step 2: Fixed K (interlayer) slowly replenishes these pools as they are depleted.
Step 3: Lattice K, locked in primary minerals, feeds the system over the long term via weathering.
Step 4: All four pools exist, so the correct answer is \[ \boxed{\text{(A), (B), (C) and (D)}} \]