Magnesium Oxide Supplier South Africa | Agricultural Grade MgO

What Is Magnesium Oxide?

Magnesium Oxide (MgO) is an inorganic compound produced by calcining magnesite or other magnesium-containing minerals. Agricultural-grade MgO contains at least 90% MgO and is a slow-release magnesium source that gradually dissolves in soil moisture to supply Mg²⁺ ions to the root zone. Its slower release compared to magnesium sulphate makes it suitable as a long-term soil amendment rather than a fast-correction foliar product.

MgO in Soil Amendment and Blending

Magnesium deficiency is common in sandy, acidic, and heavily leached soils, as well as in soils with high potassium or calcium that compete with magnesium uptake. Agricultural MgO applied to the soil provides a sustained magnesium supply over one or more growing seasons. In blended fertilizers, MgO is included as a secondary nutrient to meet crop magnesium demand without requiring separate applications. It is also used in livestock mineral feeds as a supplemental magnesium source.

Sourcing Magnesium Oxide From Terracore

Terracore supplies agricultural and technical grade magnesium oxide in powder form in 25 kg bags and bulk. We supply fertilizer blenders, agricultural co-operatives, and livestock feed manufacturers across the region.