So the presence of Ca in gypsum or K and Mg in KMag should bind when the S breaks the H bonds thus creating a neutralizing effect?
S is the "catalyst" and starts the reaction which reacts with water and releases H for the cation exchange (nutrient release) which stimulates root and plant growth response.
I hope I am going in the right direction for you!
I found more info. I will post it soon.
"Nutrients adsorbed on the clay are taken by the plant root mainly as it exchanges hydrogen or acidity for them." - W.A. Albrecht, Ph.D. "Albrecht's Foundation Concepts" - Chap. 26, pg. 322
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