Peak fixation of K takes place:__________?
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Answer: C. 2:1 clay mineral
Explanation
Potassium fixation occurs most intensely within the interlayer spaces of 2:1 clay minerals. Minerals like illite possess specific structural spacing that traps potassium ions securely. Crystalline lattices of 2:1 clays contract and fix potassium against exchange reactions. Clay minerals in soils are classified based on the ratio of tetrahedral to octahedral sheets. Potassium fixation renders applied fertilizer potassium temporarily unavailable to plant roots. The interlayer charge of 2:1 silicate clays attracts and holds potassium ions tightly.
Agronomists must account for potassium fixation when calculating fertilizer application rates. Soil mineralogy directly influences nutrient availability and agricultural fertilizer efficiency. Managing soil fertility requires understanding how clay minerals interact with plant nutrients. 1:1 clay minerals like kaolinite lack the expanding interlayer space needed for high fixation. 1:2 is an incorrect structural designation not used in standard clay mineralogy. 2:2 clay minerals such as chlorite exhibit different structural fixation characteristics.
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