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Sodium can bind to the potting mix molecules through the cation exchange capacity of the soil.
The cation exchange capacity of the molecules will ideally result in the attachment of potassium, magnesium and calcium ions so they are then available as a reserve to the soil solution . These cations are continuously changing between being soluble in the soil solution to binding onto the molecules. As plants remove ions from the soil solution by absorption through the roots new cations will release from the molecules due to the drop in concentration in the soil solution. These displaced cations are then likely to be leached out of the bag if they are not absorbed by the plant. The logical conclusion of this is a drop in the supply level of the beneficial elements to the plant and a corresponding increase in the level of non-essential sodium in the mix.