Dolomite powder with MgO around 20% is widely used in agriculture mainly as a soil conditioner and magnesium source. Here’s how it works and where it’s useful:
1. Soil pH Correction (Liming Agent)
Dolomite contains calcium carbonate (CaCO₃) and magnesium carbonate (MgCO₃).
When applied to acidic soils, it neutralizes acidity, increasing pH to an optimal range for most crops.
The magnesium carbonate portion specifically adds magnesium while also contributing to liming effect.
2. Magnesium Supplement for Crops
With 20% MgO, it’s an excellent natural source of magnesium, an essential plant nutrient.
Magnesium is the central atom in chlorophyll molecules — vital for photosynthesis.
Prevents or corrects magnesium deficiency symptoms such as interveinal chlorosis in leaves.
3. Calcium Supply
Besides magnesium, dolomite provides CaO (usually ~30–35%), strengthening plant cell walls and improving crop quality.
4. Long-Lasting Effect
Dolomite powder releases nutrients slowly, offering a steady supply of Ca and Mg over time.
Less prone to leaching compared to water-soluble fertilizers.
5. Specific Applications
Tea, coffee, rubber, sugarcane, fruit orchards – where both calcium and magnesium are crucial.
Vegetable cultivation – particularly tomatoes, peppers, leafy greens.
Pasture lands – improves forage quality for livestock by increasing Mg content in grasses (prevents grass tetany).