Clay colloids have negative charges on their surfaces and attract positively charged ions from the soil solution.

Name: Clay colloids have negative charges on their surfaces and attract positively charged ions from the soil solution.
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Quizplus · Accepted Answer

This is due to the isomorphous substitution of Al3+ and Si4+ ions in the crystal lattice, which leaves negatively charged ion exchange sites on the surface. This allows clay particles to form complexes with cations and serve as a reservoir of nutrients for plants.

Clay Colloids Have Negative Charges on Their Surfaces and Attract