Why Magnesium Sulfate Heptahydrate Is a Reliable Source of Magnesium and Sulfur
Technical Introduction
Magnesium Sulfate Heptahydrate (MgSO₄·7H₂O) is a white crystalline salt widely used in agriculture, horticulture, and industry.
It supplies both magnesium (Mg) and sulfur (S), essential nutrients for chlorophyll synthesis, enzyme activity, protein formation, and overall plant growth.
Its high solubility makes it ideal for soil application, foliar feeding, and fertigation.
Applications
1. Agriculture & Horticulture
Micronutrient Fertilizer: Corrects magnesium and sulfur deficiencies in cereals, fruits, vegetables, and legumes.
Foliar Spray: Rapidly improves chlorophyll content and plant vitality.
Soil Amendment: Improves magnesium availability in deficient soils.
2. Industrial Uses
Chemical Manufacturing: Precursor in magnesium-based chemicals.
Food & Pharmaceuticals: Used as a mineral supplement (E518) and in laxatives.
Textiles & Paper: Used in sizing and bleaching processes.
3. Other Uses
Aquaculture: Supplies magnesium to aquatic species.
Advantages
Highly Soluble: Quickly available for plant uptake.
Dual Nutrient Source: Supplies magnesium and sulfur efficiently.
Versatile Application: Suitable for soil, foliar, fertigation, and industrial use.
Safe and Stable: Non-toxic and long shelf life when stored properly.
Typical Parameters
| Property | Value |
|---|---|
| Chemical Formula | MgSO₄·7H₂O |
| Magnesium (Mg) Content | ~9–10% |
| Sulfur (S) Content | ~13% |
| Appearance | White crystalline heptahydrate crystals |
| Solubility in Water | 710 g/L at 20°C |
| pH (5% solution) | 5–6 |
| Purity | ≥ 98% |
| Shelf Life | 2 years in dry, sealed storage |
FAQs
Q1: What is the difference between magnesium sulfate heptahydrate and anhydrous magnesium sulfate?
A1: Heptahydrate contains water molecules (MgSO₄·7H₂O) and is highly soluble, whereas anhydrous MgSO₄ is more concentrated but less soluble in water.
Q2: Can it be used as a foliar spray?
A2: Yes, a 1–2% solution is commonly used to rapidly correct magnesium deficiency.
Q3: Is it safe for crops and livestock?
A3: Yes, it is non-toxic when applied at recommended rates.
Q4: How quickly does it correct magnesium deficiency?
A4: Foliar applications show visible results within a few days; soil applications may take a week or more.
Q5: How should it be stored?
A5: Keep in a dry, cool, ventilated area to prevent caking and moisture absorption.
Free Consultation
Name*
E-Mail*
TEL
Message*