The maximum fixation of K occurs

A. in 1 : 1 type clay minerals

B. in 1 : 2 type clay minerals

C. in 2 : 2 type clay minerals

D. in 2 : 1 type clay minerals

Answer: Option D

Solution(By Examveda Team)

The maximum fixation of K occurs in 2 : 1 type clay minerals.
Potassium fixation occurs when potassium ions form a surface complex with oxygen atoms in the interlayers of certain silicate clay minerals. Potassium availability is affected by a variety of factors, one of them is soil moisture, soil moisture is required to liberate fixed potassium and provide the soil solution necessary for plant intake.