Ferrous Sulfate Monohydrate
- Appearance: Pale green to off-white powder
- Chemical Formula: FeSO4·H2O
- CAS No.: 17375-41-6
- Ferrous Sulfate Monohydrate (FeSO4·H2O): > 98%
- Ferrous Iron (Fe): > 30%
- Sulfur (S): > 17%
- Water Solubility: 100%
- Water-Insoluble Matter: < 0.1%
- Free Acid: < 0.5%
- Moisture: < 1.0%
- pH: 3.0-5.0 (1% solution)
Reference price range:USD 460 - 730
Ferrous Sulfate Monohydrate
Premium agricultural Ferrous Sulfate Monohydrate: high-analysis Fe/S raw material for iron correction and soil-management formulas
Ihumate Ferrous Sulfate Monohydrate (FeSO4·H2O, CAS 17375-41-6) is a high-purity agricultural iron-sulfur fertilizer raw material with FeSO4·H2O > 98%, ferrous iron (Fe) > 30% and sulfur (S) > 17%. The pale green to off-white powder is designed for water-soluble fertilizers, compound fertilizers, granulated fertilizers, foliar products, fertigation products, soil acidification support and iron-deficiency correction.
1. Fast iron nutrition: ferrous iron supports chlorophyll formation, respiration and enzyme activity, making it useful where crops show iron chlorosis in alkaline, calcareous or high-phosphate soils.
2. Dual Fe/S nutrition: iron improves leaf greening and photosynthetic capacity, while sulfur supports amino acids, proteins, oils, flavor compounds and stress metabolism.
3. Built for fertilizer factories: it can be used in NPK, WSF, compound fertilizers, granules, humic acid, amino acid and micronutrient systems as an economical Fe/S module.
4. The Ihumate advantage: batch control covers assay, Fe, sulfur, insoluble matter, free acid, moisture, pH, appearance and dissolution performance, backed by COA, SDS, export documents, dependable supply, formulation support and OEM/ODM packaging.
Compatibility note: ferrous iron can oxidize; store sealed and dry. Avoid direct concentrated mixing with phosphates, carbonates, strong alkaline materials and oxidizers. Use A/B tanks where needed.
Ferrous Sulfate Monohydrate Specifications
| Technical Parameters | Detailed Specs | Testing Methods | Reference Standards |
|---|---|---|---|
| Appearance | Pale green to off-white powder | Visual inspection | - |
| Chemical Formula | FeSO4·H2O | - | - |
| CAS No. | 17375-41-6 | - | - |
| Ferrous Sulfate Monohydrate (FeSO4·H2O) | > 98% | Titration | - |
| Ferrous Iron (Fe) | > 30% | Potassium dichromate titration | - |
| Sulfur (S) | > 17% | Calculated value | - |
| Water Solubility | 100% | Visual and gravimetric method | - |
| Water-Insoluble Matter | < 0.1% | Gravimetric method | - |
| Free Acid | < 0.5% | Acid-base titration | - |
| Moisture | < 1.0% | Oven drying | - |
| pH | 3.0-5.0 (1% solution) | pH meter | - |
Agricultural Ferrous Sulfate Monohydrate - Product Introduction Video
- Premium agricultural Ferrous Sulfate Monohydrate pale green powder
- Solubility, particle size and OEM packaging presentation
COA, TDS, MSDS & HM Test Reports
Certificate of Analysis (COA)
Certificate of Analysis: Ferrous Sulfate Monohydrate
Technical Data Sheet (TDS)
TDS: Ferrous Sulfate Monohydrate
Safety Data Sheet (MSDS)
MSDS: Ferrous Sulfate Monohydrate
Heavy Metal Test Report
Heavy Metal Test Report: Ferrous Sulfate Monohydrate
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Frequently Asked Questions
1
What is Ferrous Sulfate Monohydrate used for in agriculture?
It supplies iron and sulfur for soil iron correction, chlorosis management, mild soil acidification support, WSF, compound fertilizer, granulation, foliar and fertigation formulas.
2
How is ferrous sulfate different from EDTA iron?
Ferrous sulfate is cost-efficient for soil use and fertilizer raw-material formulas. EDTA iron is more stable in neutral to mildly acidic fertigation systems and precision deficiency correction.
3
Which crops often need iron?
Citrus, grapes, strawberry, tomato, cucumber, pepper, ornamentals, nursery crops and fruit trees are prone to iron chlorosis, especially with alkaline soils or high-bicarbonate irrigation water.
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
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More questions about our products?
Application & Dosage: Ferrous Sulfate Monohydrate
For WSF, compound fertilizers, granulated fertilizers, foliar products, fertigation products, soil conditioning and Fe/S premixes. Count FeSO4·H2O, Fe and S in formulation calculations and adjust from soil pH, bicarbonate level, tissue analysis and registration requirements.
Fertilizer Manufacturing
- Fe/S Raw-Material Module:Calculate inclusion from FeSO4·H2O > 98%, Fe > 30% and S > 17% for NPK, WSF, compound, granulated and liquid fertilizers.
- Stability Control:Validate water quality, pH, phosphates, carbonates, alkaline materials, oxidizers and storage stability; use A/B tanks for concentrated stocks where needed.
Agricultural Application
- Root-Zone Iron Supply:Split applications during new flush, early iron chlorosis or alkaline-soil management according to soil pH, EC, drainage and tissue analysis.
- Fast Foliar Correction:Spray low concentrations at early iron deficiency; avoid heat and intense light, and jar-test mixes with pesticides or micronutrients.
Application Ratio Scheme
| Crop Name | Growth Stage | Application Ratio |
|---|---|---|
| Fertilizer formulation | WSF, compound, granulated or liquid fertilizer | Calculate from Fe > 30%, S > 17% and target guaranteed analysis |
| Fertigation/Soil drench | Early iron chlorosis or alkaline-soil management | 3-10 kg/ha per application; adjust by analysis |
| Foliar spray | Early iron deficiency | 0.1%-0.3%; test crop safety first |
| Soil or granulated fertilizer | Base dressing or top dressing formula | Follow soil testing, crop Fe demand and local label directions |
Product Advantages: Ferrous Sulfate Monohydrate
Ihumate Ferrous Sulfate Monohydrate delivers high-analysis iron and sulfur, clean solubility and stable batch management for professional fertilizer manufacturers.
1
High-Analysis Ferrous Iron Source
FeSO4·H2O > 98% and Fe > 30% support iron-chlorosis correction and iron-fortified fertilizer formulas.
2
Dual Iron and Sulfur Nutrition
Iron supports chlorophyll and photosynthesis, while sulfur supports amino acids, proteins, oils, flavor and stress-related metabolism.
3
Economical for Large-Scale Formulas
Suitable for NPK, WSF, compound fertilizer, granulation, humic acid, amino acid and micronutrient systems.
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: Ferrous Sulfate Monohydrate
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
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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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