Steady Supply Magnesium Sulfate is a versatile agricultural fertilizer material designed to provide readily available magnesium and sulfur for modern crop production. With good water solubility and flexible application options, it can be incorporated into fertilizer blends or applied through fertigation, foliar spraying, and soil treatment according to different crop management programs.
Available in both heptahydrate and monohydrate forms, the product can meet different formulation and application requirements. It is suitable for open-field crops, vegetables, fruit trees, greenhouse cultivation, and other intensive farming systems where precise nutrient management is required.
With consistent quality and dependable supply, Steady Supply Magnesium Sulfate is a practical choice for fertilizer manufacturers, agricultural distributors, and growers seeking a reliable magnesium-based fertilizer ingredient for regular crop nutrition programs.
Manufactured by Shandong AOLANSU Environmental Protection Technology Co., Ltd. in China, the product is processed under controlled crystallization and purification procedures. AOLANSU also holds a Hazardous Chemicals Business License, supporting compliant handling and supply of applicable chemical fertilizer products for qualified customers.
For agricultural buyers, the most important difference between magnesium sulfate products is not simply appearance or particle size, but the concentration of active magnesium and the intended application method. AOLANSU offers both heptahydrate and monohydrate forms so distributors, fertilizer formulators, and commercial farms can select the appropriate grade according to nutrient concentration, water solubility, application equipment, and crop requirements.
Magnesium Sulfate Monohydrate for Higher Magnesium Concentration
Magnesium Sulfate Monohydrate contains less crystallization water than the heptahydrate form and therefore provides a higher concentration of magnesium per unit weight. With MgO content of approximately ≥39.0%, it is suitable for fertilizer formulations and agricultural programs where higher magnesium concentration is required.
The higher nutrient density can also help reduce the amount of material required to deliver a specific magnesium target, depending on the application program and soil test results.
Magnesium Sulfate Heptahydrate contains crystallization water and offers excellent water solubility. It is commonly selected for fertigation, foliar application, greenhouse production, and general agricultural magnesium supplementation where rapid dissolution is important.
With an effective MgO content of approximately ≥25.0% according to the supplied specification, this grade provides a practical source of magnesium together with sulfur for crops requiring both nutrients.
Because this product is a magnesium fertilizer rather than an compound fertilizer, its nutrient value should be evaluated according to magnesium oxide, magnesium, and sulfur content rather than an N-P-K ratio.
| Specification | Heptahydrate | Monohydrate |
|---|---|---|
| Chemical Formula | MgSO₄·7H₂O | MgSO₄·H₂O |
| Magnesium Oxide (MgO) | ≥25.0% | ≥39.0% |
| Elemental Magnesium (Mg) | ≈15.1% | ≈23.5% |
| Sulfur (S) | ≈19.5% | ≈31.8% |
| Purity | ≥98.5% | ≥98.5% |
| Moisture | ≤1.0% | ≤0.5% |
| Chloride (Cl⁻) | ≤0.02% | ≤0.02% |
| Lead (Pb) | ≤0.001% | ≤0.001% |
| Iron (Fe) | ≤0.002% | ≤0.002% |
| pH Value | 5.5–7.5 | 5.5–7.5 |
Note: MgO, elemental Mg and sulfur values are theoretical conversions based on the stated chemical composition. The final commercial specification should be confirmed by the product COA for each production batch.
One of the most recognizable symptoms is interveinal chlorosis, where the tissue between leaf veins becomes yellow while the veins remain relatively green. Symptoms often appear first on older leaves because magnesium is mobile within the plant.
Other possible symptoms include reduced photosynthetic activity, weak plant growth, premature leaf discoloration, poor fruit development, and inconsistent crop quality. Soil and plant tissue testing should be used to confirm magnesium deficiency before establishing a large-scale fertilizer program.
Magnesium and sulfur are important secondary nutrients that complement the primary nutrients supplied by conventional NPK fertilizers. Including these elements in a crop nutrition program can help maintain a more balanced nutrient supply, particularly when soil conditions or intensive cultivation reduce the availability of secondary nutrients.
Adequate magnesium availability is closely associated with the way plants process and distribute nutrients during active growth. A suitable supply can help crops make better use of essential nutrients and maintain steady development from early vegetative growth through later production stages.
Sulfur contributes to several physiological processes involved in plant growth and nutrient utilization. When sulfur availability is insufficient, crop development may become less uniform. Providing sulfur together with magnesium can help maintain a more complete nutrient profile and support consistent crop performance.
Adapting to Different Growing Conditions
The demand for magnesium and sulfur can vary with crop type, soil characteristics, weather conditions, and cultivation intensity. For this reason, magnesium sulfate can be incorporated into different fertilization programs according to actual soil and crop requirements, including field application, fertigation, and foliar feeding.
For fields with confirmed magnesium deficiency, the product can be incorporated into the soil during land preparation or applied around the crop root zone. Soil application is suitable for field crops, orchards, and commercial agricultural production where magnesium reserves need to be replenished.
The application rate should be determined according to soil test results, crop requirements, existing magnesium levels, soil texture, and the selected product grade rather than using one fixed dosage for every crop.
Fertilizer Blending and Formulation
For fertilizer manufacturers and agricultural distributors, the different MgO concentrations of heptahydrate and monohydrate provide flexibility when developing customized nutrient formulations. Compatibility testing should be conducted before combining concentrated fertilizer solutions or other agricultural chemicals.
Fertigation for Precision Crop Management
Because of its high water solubility, the product can be incorporated into fertigation programs for drip irrigation and other controlled irrigation systems. This allows magnesium to be delivered directly to the active root zone and can be particularly useful in greenhouse vegetables, fruit orchards, and high-value crops.
Foliar feeding can be used when crops show visible magnesium deficiency during active growth. The fertilizer is dissolved in clean water and sprayed evenly over the foliage according to the crop's tolerance and agricultural practice.
A 1%–2% solution may be used as a general reference, but the final concentration should be adjusted according to crop species, leaf sensitivity, environmental conditions, and local agronomic recommendations.
Flexible Use in Orchard Management
Magnesium sulfate can be included in orchard fertilization plans when growers need to fine-tune secondary nutrient supply. It can be combined with regular fertilizer programs during different stages of orchard management, with the application rate adjusted according to soil conditions, crop growth, and existing nutrient inputs.
For crops grown under protected or intensive conditions, nutrient management often requires greater flexibility because irrigation and fertilization are carried out more frequently. Water-soluble magnesium sulfate can be added to liquid fertilizer systems or used as part of supplemental feeding programs to help maintain a consistent supply of magnesium and sulfur.
In large-scale agricultural operations, magnesium sulfate can serve as a complementary fertilizer material alongside conventional NPK products. Its application can be adjusted according to soil analysis, fertilizer formulations, irrigation practices, and the nutritional requirements of the crops being cultivated.
Different crops and growing regions can have different nutrient management requirements. Magnesium sulfate can therefore be incorporated into customized fertilizer formulations or seasonal feeding schedules rather than being limited to a single application method. This flexibility makes it suitable for growers and fertilizer suppliers managing diverse agricultural production systems.
| Item | Heptahydrate | Monohydrate |
|---|---|---|
| Chemical Formula | MgSO₄·7H₂O | MgSO₄·H₂O |
| MgO Content | ≥25.0% | ≥39.0% |
| Elemental Mg | ≈15.1% | ≈23.5% |
| Sulfur | ≈19.5% | ≈31.8% |
| Water Solubility | Excellent | Excellent |
| Main Advantage | Fast dissolution and flexible agricultural application | Higher magnesium concentration per unit weight |
| Typical Use | Fertigation, foliar feeding, greenhouse and soil application | High-concentration fertilizer formulations and targeted magnesium supplementation |
| Parameter | Specification |
|---|---|
| Product Name | Steady Supply Magnesium Sulfate |
| Product Forms | Magnesium Sulfate Heptahydrate / Monohydrate |
| Chemical Formula | MgSO₄·7H₂O / MgSO₄·H₂O |
| CAS No. | 7487-88-9 |
| Purity | ≥98.5% |
| MgO Content | ≥25.0% / ≥39.0% |
| Elemental Magnesium | ≈15.1% / ≈23.5% |
| Sulfur Content | ≈19.5% / ≈31.8% |
| Appearance | White crystalline powder or granules |
| Solubility | Highly water soluble |
| Moisture | ≤1.0% / ≤0.5% |
| Chloride | ≤0.02% |
| Lead | ≤0.001% |
| Iron | ≤0.002% |
| pH Value | 5.5–7.5 |
| Particle Size | 1–4 mm granules; 80–100 mesh powder; customized sizes available |
| Packaging | 25kg PE-lined woven bags, 50kg drums, 1000kg jumbo bags |
| Shelf Life | 24 months under recommended storage conditions |
AOLANSU inspects incoming raw materials for purity, moisture, impurity levels, and other key indicators before production. This provides a controlled starting point for consistent fertilizer manufacturing.
Controlled crystallization and purification processes are used to maintain consistent crystal structure, nutrient concentration, solubility, and appearance. Process parameters are monitored throughout production.
For qualified international buyers, AOLANSU can provide COA, MSDS/SDS, packing information, and other applicable export documentation to support product evaluation, transportation, and customs procedures.
Finished Product Analysis
Finished batches are tested for magnesium content, sulfur content, moisture, particle size, chloride, heavy metals, and other relevant quality indicators before shipment.
The primary difference is crystallization water and nutrient concentration. Heptahydrate contains more water of crystallization and provides approximately 25% MgO, while monohydrate provides a higher MgO concentration of approximately 39%. The appropriate grade depends on the required magnesium concentration and application program.
Magnesium supplementation may be useful for citrus, grapes, tomatoes, potatoes, leafy vegetables, rice, wheat, corn, tea, tobacco, and other crops when soil or plant testing indicates insufficient magnesium availability.
Does Agricultural Magnesium Sulfate contain NPK nutrients?
No. Agricultural Magnesium Sulfate is not an NPK fertilizer. Its main nutritional value comes from magnesium and sulfur. It should normally be used as a secondary-nutrient supplement alongside a suitable NPK fertilization program when crops require additional magnesium or sulfur.
Yes. AOLANSU can support sample evaluation, customized particle sizes, packaging, labeling, and other specifications according to the purchasing requirements of distributors, fertilizer manufacturers, and commercial agricultural customers.
AOLANSU provides magnesium and sulfur fertilizer solutions for agricultural distributors, fertilizer manufacturers, importers, and commercial farming projects. Rather than treating all magnesium fertilizers as the same product, we provide different magnesium sulfate forms and concentration levels to help buyers select products according to their application requirements.
As a China-based manufacturer, we combines controlled production, batch testing, flexible packaging, export documentation, and stable supply capability.
If you are sourcing magnesium fertilizer for agricultural distribution, fertilizer formulation, greenhouse production, orchards, or large-scale farming, contact AOLANSU for current specifications, COA, packaging options, sample availability, and bulk pricing.
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