Geochemical modeling of magnesium participation in the sodification of solonetz soils in the Akmola region, Kazakhstan - Askhat Naushabayev; Nurzikhan Seitkali; Tursunay Vassilina; Karlyga Karayeva; Svetlana Naushabayeva; Nurymzhan Aubakirov; Ayan Abay (Geoderma Regional, 2026)