9
Read the following statements
(A) . Ata given time, potassium in the solution and exchangeable forms constitutes the fraction readily available to plants
(B) . The exchangeable K tends to attain equilibrium slowly with solution K but, rapidly with non-exchangeable K.
(C) . The solution K concentration largely controls the K movement (diffusion) towards the plant roots and thereby, the K
uptake by plants.
(D) . On depletion of exchangeable K, the non-exchangeable K replenishes it and the supply of K to plants is maintained.
Choose the correct answer from the options given below:
EXPLANATION
Micronutrient Chemistry
- Statement (A) is correct: Water-soluble K and exchangeable K on clay surfaces constitute the readily plant-available potassium pool.
- Statement (B) is incorrect: Solution K and exchangeable K achieve dynamic equilibrium rapidly (within seconds/minutes), whereas equilibrium between exchangeable K and non-exchangeable (interlayer) K is a slow, diffusion-controlled process.
- Statement (C) is correct: Potassium reaches root surfaces predominantly via diffusion down the solution concentration gradient.
- Statement (D) is correct: As plants absorb exchangeable K, non-exchangeable mineral K gradually releases from clay lattice edges to replenish the pool.
- Conclusion: Statements (A), (C), and (D) only are correct. (Correct answer: Option 1)
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