Magnesium Sulfate Heptahydrate
- Appearance: White crystals or crystalline powder
- Chemical Formula: MgSO4·7H2O
- CAS No.: 10034-99-8
- Magnesium Sulfate Heptahydrate (MgSO4·7H2O): > 99%
- Magnesium Oxide (MgO): > 16%
- Magnesium (Mg): > 9.6%
- Sulfur (S): > 12.8%
- Water Solubility: 100%
- Water-Insoluble Matter: < 0.1%
- pH: 5.0-8.0 (1% solution)
Reference price range:USD 260 - 370
Magnesium Sulfate Heptahydrate
Premium agricultural Magnesium Sulfate Heptahydrate: fast magnesium and sulfur nutrition for chlorophyll, photosynthesis and crop quality
Ihumate Magnesium Sulfate Heptahydrate (Epsom Salt, MgSO4·7H2O, CAS 10034-99-8) is a high-purity, fully water-soluble agricultural magnesium-sulfur fertilizer raw material with MgSO4·7H2O > 99%, MgO > 16%, Mg > 9.6% and sulfur (S) > 12.8%. The white crystal or crystalline powder grade suits fertigation, sprinklers, foliar programs, hydroponics, compound fertilizers, water-soluble fertilizers and liquid fertilizer production.
1. Dual Mg and S nutrition: magnesium is central to chlorophyll, photosynthesis and assimilate transport, while sulfur supports amino acids, protein synthesis and flavor compounds.
2. Fully soluble for rapid correction: clean dissolution makes it practical for protected cultivation, fruits, vegetables, flowers, tea and cash crops that need fast magnesium and sulfur supply.
3. Flexible formulation: it blends into NPK, EDTA micronutrient, humic acid, amino acid and seaweed systems as a simple Mg/S nutrition module.
4. The Ihumate advantage: batch control covers assay, MgO, Mg, sulfur, insoluble matter, moisture, pH, appearance and dissolution performance, backed by COA, SDS, export documents, dependable supply, formulation support and OEM/ODM packaging.
Compatibility note: avoid direct concentrated mixing with phosphates, carbonates and strong alkaline materials. With calcium fertilizers, run a jar test and manage concentrated stocks with A/B tanks.
Magnesium Sulfate Heptahydrate Specifications
| Technical Parameters | Detailed Specs | Testing Methods | Reference Standards |
|---|---|---|---|
| Appearance | White crystals or crystalline powder | Visual inspection | - |
| Chemical Formula | MgSO4·7H2O | - | - |
| CAS No. | 10034-99-8 | - | - |
| Magnesium Sulfate Heptahydrate (MgSO4·7H2O) | > 99% | EDTA titration | - |
| Magnesium Oxide (MgO) | > 16% | EDTA titration | - |
| Magnesium (Mg) | > 9.6% | EDTA titration | - |
| Sulfur (S) | > 12.8% | Calculated value | - |
| Water Solubility | 100% | Visual and gravimetric method | - |
| Water-Insoluble Matter | < 0.1% | Gravimetric method | - |
| pH | 5.0-8.0 (1% solution) | pH meter | - |
Agricultural Magnesium Sulfate Heptahydrate - Product Introduction Video
- Premium agricultural Magnesium Sulfate Heptahydrate white crystals
- Solubility, particle size and OEM packaging presentation
COA, TDS, MSDS & HM Test Reports
Certificate of Analysis (COA)
Certificate of Analysis: Magnesium Sulfate Heptahydrate
Technical Data Sheet (TDS)
TDS: Magnesium Sulfate Heptahydrate
Safety Data Sheet (MSDS)
MSDS: Magnesium Sulfate Heptahydrate
Heavy Metal Test Report
Heavy Metal Test Report: Magnesium Sulfate Heptahydrate
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Frequently Asked Questions
1
What is Magnesium Sulfate Heptahydrate used for in agriculture?
It supplies magnesium and sulfur in fertigation, sprinklers, foliar sprays, hydroponics, water-soluble fertilizers, liquid fertilizers and compound fertilizer production.
2
How is heptahydrate different from magnesium sulfate monohydrate?
Heptahydrate has more crystal water and excellent dissolution for fast water-soluble use. Monohydrate has a higher nutrient density and is often chosen for granulation, compound fertilizers or formulas requiring more nutrient per unit weight.
3
Which crops often need magnesium?
Citrus, grapes, tomato, cucumber, pepper, potato, tea, coffee, oil crops and flowers often need Mg, especially in sandy soils, high-potassium programs or acidic leached soils.
4
Can it be used for foliar feeding?
Yes where local labels allow it. Use low concentrations, spray in the morning or evening, avoid heat and intense light, and test compatibility and crop safety first.
5
Do the packaging-image specifications apply?
No. Packaging images show Ihumate bag formats and OEM/ODM capability only. Final guaranteed analysis, net weight and regulatory text follow the contract, batch COA, SDS and destination-market requirements.
6
Are you a trading company or a manufacturer?
We are a professional manufacturing enterprise. Our modern factory is located in Huozhou, Linfen, Shanxi, China. With an annual capacity of 500,000 tons, we invite global partners to visit our facility.
7
How do you perform quality control?
8
Do you provide samples?
9
What are the payment terms?
10
How can I track my shipment after payment?
11
What is the Minimum Order Quantity (MOQ)?
12
Can you customize packaging or print our logo?
13
How long is the delivery time?
More questions about our products?
Application & Dosage: Magnesium Sulfate Heptahydrate
For fertigation, sprinklers, foliar feeding, hydroponics, and production of water-soluble, liquid and compound fertilizers. Count MgO, Mg and S in formulation calculations and adjust from soil, irrigation-water and tissue analysis.
Agricultural Application
- Fertigation and Hydroponics:Split Mg and S supply during vegetative growth, fruit sizing and quality formation according to EC, pH, drainage and tissue analysis.
- Foliar Magnesium:Spray low concentrations at early deficiency; avoid heat and intense light, and jar-test mixes with pesticides or micronutrients.
Fertilizer Manufacturing
- Mg/S Nutrition Module:Calculate inclusion from MgO > 16%, Mg > 9.6% and S > 12.8% for NPK, WSF and liquid fertilizers.
- Compatibility Control:Validate water quality, pH, phosphates, carbonates, calcium salts and storage stability; use A/B tanks where needed.
Application Ratio Scheme
| Crop Name | Growth Stage | Application Ratio |
|---|---|---|
| Fertigation/Sprinklers | Growth, fruit sizing or Mg deficiency correction | 10-25 kg/ha per application; adjust by analysis |
| Foliar spray | Early Mg deficiency or quality improvement | 0.5%-2.0%; test crop safety first |
| Hydroponics/Soilless | Nutrient solution preparation | Calculate from target Mg, S and EC |
| Fertilizer production | WSF, liquid fertilizer and compound fertilizer | Calculate by target MgO, Mg and S content |
Product Advantages: Magnesium Sulfate Heptahydrate
Ihumate Magnesium Sulfate Heptahydrate provides high purity, clean solubility and stable batch management for fertilizer manufacturers and professional crop programs.
1
High-Purity Soluble Mg/S Source
MgSO4·7H2O > 99%, MgO > 16%, Mg > 9.6% and S > 12.8% support accurate formulation.
2
Fast Magnesium Deficiency Correction
Excellent solubility suits foliar, fertigation and hydroponic systems to support chlorophyll and photosynthetic recovery.
3
Quality and Stress Support
Magnesium supports sugar transport and dry matter; sulfur supports proteins, flavor and stress-related metabolism.
4
Ihumate Export and OEM Support
Batch COA, SDS, export documents, reliable supply, formulation advice and 1-25 kg OEM/ODM packaging are available.
Certifications: Magnesium Sulfate Heptahydrate
Ihumate is backed by globally recognized certifications.
- 🏅 OMRI Listed – Approved for organic use (USDA/NOP standards)
- 🏅 CERES Certified – High-standard organic inputs for sustainable agriculture
- ✔ Excellent international production process with full batch traceability
- ✔ Meeting the strict demands of global distributors and formulators
Ihumate Global Exhibition Videos
We showcase our Humic Acid, Seaweed, Liquid Fertilizer, and Bio-control series globally.
Join us at our 2026 exhibitions:
Event: Shanghai CAC (Fshow)
Booth: 12G05
Date: March 17-19, 2026
Address: No. 333 Songze Avenue, Qingpu District, Shanghai
Join us at our 2026 exhibitions:
Event: Shanghai CAC (Fshow)
Booth: 12G05
Date: March 17-19, 2026
Address: No. 333 Songze Avenue, Qingpu District, Shanghai
No. 64 Nangou, Chencun, Bailong Town, Huozhou City, Linfen City, Shanxi Province
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