This is expressed as cmol of cations per kg of soil. When the CEC is combined with the cmol weight of a particular cation, then the 'amount' of that cation can be expressed on a weight basis. The next step is the conversion of g kg soil to ppm. Flocculation and Dispersion Soils are generally in an aggregated state. Aggregation, however, is dependent on the soil colloids and the cations associated with them.
Soil colloids can be in either a flocculated or dispersed state.
The normal situation is for colloids to be in a flocculated state. Individual particles stick together to form aggregates of particles or floccules . Such aggregates do not move in the soil solution and form the basis for soil structure. When soil particles are dispersed , aggregates do not form, and each particle behaves as an individual. Without aggregation, water, air, and root movement in the soil is inhibited.