Agricultural Grade Potassium Sulfate (K2SO4), commonly known as Sulfate of Potash (SOP), is a sulfate-based potassium fertilizer containing 50% K2O equivalent. It supplies potassium alongside sulfate sulfur, making it the preferred choice for crop nutrition programs, dry fertilizer blending, and soil management where chloride control and sulfur intake are required.
Product Specifications
|
Parameter |
Specification / Detail |
|
Product Name |
Agricultural Grade Potassium Sulfate |
|
Common Name |
Sulfate of Potash / SOP |
|
Chemical Formula |
K2SO4 |
|
K2O Content |
50% Min. (Guaranteed Grade) |
|
Primary Nutrient |
Potassium (K) |
|
Secondary Nutrient |
Sulfur (S) in Sulfate form |
|
Chloride (Cl) |
Low Chloride Grade (Verify batch COA) |
|
Moisture Content |
Defined limit per application requirements |
|
Physical Forms |
Granular / Crystalline / Powder / Water-Soluble Grade |
|
Packaging Options |
25 kg, 50 kg, or 1000 kg Jumbo Bags |
Key Technical Considerations for Procurement
Guaranteed K2O Content: Confirm whether 50% refers to a minimum guaranteed floor, typical test value, or production target prior to ordering.
Guaranteed Sulfur Content: Request the specific sulfur percentage on the COA rather than assuming standard values.
Chloride (Cl) Thresholds: Specify maximum allowable chloride limits to protect chloride-sensitive crops. Avoid unsupported marketing claims like "chloride-free" unless verified by standardized lab testing.
Moisture & Physical Handling: Strict moisture controls prevent product caking, preserve free-flowing properties, and prevent degradation during transit.
Particle Size Distribution (PSD): PSD is critical for dry fertilizer blending to prevent ingredient segregation and ensure uniform field spreading.
Water Solubility & Insoluble Matter: For fertigation or liquid formulations, select a dedicated fertigation grade with minimal insoluble residue to prevent line clogging.
Physical Grades & Crop Applications
Physical Form Options
Granular SOP: Optimized for bulk dry blending and mechanical field application.
Crystalline / Fine Powder SOP: Suitable for compound fertilizer manufacturing or direct soil application.
Water-Soluble SOP: Refined specifically for irrigation systems (fertigation and foliar spraying) with rapid dissolution.
Target Crop Applications
Fruit Crops: Grapes, citrus, berries, apples, and melons where chloride control improves yield quality and firmness.
Vegetable Crops: Potatoes, tomatoes, peppers, onions, and leafy greens needing balanced potassium and sulfur.
Specialty Crops: Tobacco, tea, tree nuts, and greenhouse crops sensitive to root-zone salinity.
Quality Control & Pre-Purchase Checklist
A reliable supplier maintains strict quality assurance across every manufacturing stage:
Raw Material Inspection: Analytical verification of raw inputs prior to processing.
Process Control: Continuous monitoring of reaction parameters, particle sizing, and drying.
Batch Testing: Analytical verification of K2O, sulfur, chloride, moisture, and PSD per production lot.
Documentation: Full batch documentation including TDS, SDS, and batch-matched COAs.
Buyer Verification Checklist:
- Review the current Technical Data Sheet (TDS) and Safety Data Sheet (SDS).
- Verify multi-batch COA records to assess physical and chemical consistency over time.
- Request and test representative pre-shipment samples in actual production processes.
- Confirm packaging specifications (liner quality, bag strength, palletization, container load).
Packaging & Logistics
|
Standard Bags |
25 kg or 50 kg woven PP bags with PE inner liners for moisture protection. |
|
Bulk Packaging |
1000 kg or 1200 kg Jumbo Bags for industrial blending facilities. |
|
Customization |
Private labeling and customized packaging formats available upon request. |
FAQ
Q: What is the main chemical difference between SOP and MOP?
A: SOP (K2SO4) provides potassium together with sulfur and contains minimal chloride. MOP (KCl) provides potassium alongside high concentrations of chloride.
Q: Can any 50% K2O SOP be used for fertigation?
A: No. Standard agricultural grade SOP may contain insoluble matter intended for dry soil blending. For drip irrigation systems, always specify fertigation-grade SOP with high solubility and minimal insoluble residue.
Q: Why is sulfur content important when purchasing SOP?
A: SOP naturally contains sulfate-sulfur, an essential plant nutrient. Verifying the exact sulfur percentage allows formulators to balance nutrient ratios accurately in complete NPK blends.
Q: How does particle size affect dry fertilizer blending?
A: Matching the particle size of SOP to other blend components prevents physical segregation during transit and handling, ensuring uniform nutrient distribution during field application.
Q: What technical documentation should I request before placing a commercial order?
A: Commercial buyers should request the Technical Data Sheet (TDS), Safety Data Sheet (SDS), product specification sheet, and a batch-specific Certificate of Analysis (COA).
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