Which cation has higher aggregation capacity in soil

Soil aggregation refers to the binding together of soil particles into clusters or aggregates.

Cations play a major role in soil aggregation by neutralizing the negative charges on clay particles and helping them to bind.

Al³⁺ (aluminum ion) has a higher charge density compared to divalent (Ca²⁺, Mg²⁺) and monovalent (K⁺) cations.

Because of its higher valency (3+), Al³⁺ can more effectively neutralize the negative charges on clay surfaces, leading to better aggregation.

Therefore, Al³⁺ has the highest aggregation capacity in soil.

Correct answer: Option A: Al³⁺