What Makes Magnesium Oxide a Key Source of Magnesium and Soil Amendment?
Technical Introduction
Magnesium oxide (MgO) is a white or off-white powder and a highly concentrated source of magnesium.
It is commonly used in agriculture, industry, and chemical manufacturing.
In plants, magnesium is essential for chlorophyll synthesis, enzyme activation, and photosynthesis, while MgO also acts as a soil neutralizer in acidic soils.
Applications
1. Agriculture & Horticulture
Magnesium Fertilizer: Supplies magnesium in soils deficient in this essential nutrient.
Soil Amendment: Neutralizes acidic soils, improving pH and nutrient availability.
Slow-Release Source: Provides magnesium gradually for long-term crop nutrition.
2. Industrial Uses
Refractory Material: Used in furnace linings and high-temperature applications.
Chemical Manufacturing: Precursor for magnesium salts and other compounds.
Construction Materials: Used in cements and ceramics.
3. Other Uses
Environmental Applications: Treats wastewater and flue gases.
Advantages
High Magnesium Content: Typically 90–95% MgO, very concentrated.
Dual Function: Supplies magnesium and neutralizes acidic soils.
Slow-Release Fertilizer: Provides long-lasting magnesium nutrition.
Versatile Industrial Uses: Suitable for refractory, chemical, and construction applications.
Typical Parameters
| Property | Value |
|---|---|
| Chemical Formula | MgO |
| Magnesium (Mg) Content | ~60–62% |
| Appearance | White or off-white powder |
| Solubility in Water | Sparingly soluble (~0.0086 g/100 mL at 20°C) |
| pH (in water suspension) | 10–12 |
| Purity | ≥ 98% |
| Shelf Life | 3 years in dry, sealed storage |
FAQs
Q1: How is magnesium oxide different from magnesium sulfate?
A1: MgO has higher magnesium content but low solubility; MgSO₄ is more soluble but lower in Mg content.
Q2: Can it be used for foliar spray?
A2: No, MgO is sparingly soluble and mainly used as a soil amendment or slow-release fertilizer.
Q3: Is it safe for crops?
A3: Yes, it is safe when applied according to recommended rates; over-application may raise soil pH excessively.
Q4: How quickly does it supply magnesium to plants?
A4: Slowly; MgO gradually dissolves in soil moisture, suitable for long-term nutrition.
Q5: How should it be stored?
A5: Keep in a dry, sealed container to avoid moisture uptake and caking.
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