Controlled-Release Potassium Sulfate for Fertilizer Manufacturers and Specialty Applications
Polymer-Coated Potassium Sulfate (PC-SOP) provides controlled-release potassium and sulfur nutrients designed for specific crop nutrition cycles. Built on a high-purity potassium sulfate (SOP) core and protected by an engineered polymer coating, PC-SOP controls nutrient release through daily soil moisture diffusion. Soil moisture gradually penetrates the outer layer, dissolves the SOP core, and allows dissolved potassium and sulfur to diffuse into the root zone at a predictable rate.
Technical Specifications
|
Parameter |
Specification / Commercial Range |
|
Product Name |
Polymer-Coated Potassium Sulfate (PC-SOP) |
|
Base Material |
Soluble Potassium Sulfate (K2SO4) |
|
Active Nutrients |
K2O: 42% - 48% | Sulfur (S): 15% - 18% |
|
Physical Form |
Coated Granules / Micro-prills |
|
Release Duration |
2 to 9 Months (Grade Dependent) |
|
Standard Test Conditions |
25 degrees C in Water / Soil Medium (EN / AOAC Methods) |
|
Coating Type |
Engineered Polyurethane / Biodegradable Polymer Options |
|
Moisture Content |
Less than 1.0% |
|
Chloride (Cl-) Content |
Less than 1.5% |
|
Bulk Density |
1.05 - 1.20 g/cm3 |
|
Documentation & Compliance |
TDS, SDS, COA, ISO 9001 Certified, REACH Registered |
Why PC-SOP Outperforms Standard SOP
|
Feature |
Standard SOP |
Polymer-Coated SOP (PC-SOP) |
|
Nutrient Source |
Potassium Sulfate |
Potassium Sulfate |
|
Release Pattern |
Immediate / Soluble |
Regulated / Controlled diffusion |
|
Leaching Risk |
High in sandy soils or heavy rain |
Significantly reduced |
|
Salt Index Impact |
Direct impact on root zone |
Low, steady nutrient availability |
|
Main Advantage |
Rapid nutrient replenishment |
Single-application continuous nutrition |
|
Primary Use |
Standard broadacre blending |
Controlled-Release NPKs, Turf, Nursery |
Particle Size Distribution (PSD) Options
|
Grade Category |
Size Range |
Target D50 |
Recommended Application |
|
Standard Granular Grade |
2.00 mm - 4.00 mm |
Approx. 3.1 mm |
Bulk blending (CRF NPK) and broadacre spreading |
|
Mini-Granule / Turf Grade |
1.00 mm - 2.00 mm |
Approx. 1.5 mm |
Golf courses, tees, greens, and specialty horticulture |
Primary Applications
Controlled-Release NPK Blends: Combines with PC-Urea and coated phosphates for custom seasonal crop formulas.
Professional Turf & Golf Courses: Provides sustained potassium for disease resistance and wear tolerance without pulse growth spikes.
Horticulture & Container Nurseries: Delivers crop-matched nutrition safe for sensitive root systems in potting substrates.
Specialty Field Crops: Ideal for high-value fruits, vegetables, and perennial crops needing long-term potassium supply.
Quality Control & B2B Qualification
Mechanical Durability: Engineered to withstand screening, conveyor handling, bulk mixing, and transit without coating failure.
Environmental Options: Biodegradable polymer coatings are available to comply with regional soil protection and microplastic regulations.
Batch Traceability: Every commercial shipment carries a unique batch number linked to its Certificate of Analysis (COA), covering K2O, Sulfur, particle size analysis, and dissolution rates.
FAQ
Q: How does temperature affect the nutrient release rate of PC-SOP?
A: Nutrient release in PC-SOP is driven by diffusion, which naturally speeds up in warmer soils and slows down in cooler soils. This mirrors crop growth rates. Standard release ratings are typically calibrated at a constant soil temperature of 25 degrees C.
Q: Does mechanical handling during bulk blending damage the coating?
A: Our polymer coating is formulated for mechanical flexibility. Normal mixing, conveying, and packaging operations will not compromise the coating integrity. However, severe drop impacts or high-shear equipment should be minimized.
Q: Are your polymer coatings compliant with environmental regulations on microplastics?
A: Yes. In addition to standard polyurethane coatings, we offer eco-friendly and biodegradable polymer options designed to meet strict international environmental standards, including European soil regulatory requirements.
Q: Can we order custom release durations or custom granule sizes?
A: Yes. We offer tailormade formulations for fertilizer manufacturers and large-scale agricultural projects. You can request target release periods ranging from 2 months to 9 months, as well as specific particle size distributions.
Q: What are the recommended storage conditions for PC-SOP?
A: PC-SOP should be stored in a cool, dry, and well-ventilated warehouse. Keep bags sealed until use, avoid stacking pallets too high to prevent mechanical pressure, and keep the material away from direct rainfall or standing water.
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