Polysulphate: Polyhalite Based Fertilizers

Created from a naturally occurring multi-nutrient mineral, polyhalite is the foundation of our Polysulphate-based fertilizers.  

What is Polysulphate (polyhalite)? 

Polyhalite (K2Ca2Mg(SO4)4 • 2H2O is a naturally occurring mineral fertilizer, mined exclusively by ICL and packaged and sold as Polysulphate®. It is soluble, plant-available, and easy to blend and spread, making it a cost-effective multi-nutrient solution.

Deposited in the earth 260 million years ago, each Polysulphate granule naturally contains Sulfur, Potassium, Calcium and Magnesium – four of the six essential macro-nutrients required for optimal plant growth. Polysulphate is mined, crushed, and screened ready for use, giving Polysulphate its naturally low carbon footprint.  

Polysulphate—a better source of Sulfur 

As a naturally occurring sulfate-based multi-nutrient, Polysulphate (polyhalite)—available as a granule or powder— requires no chemical separation or industrial processing, delivering high agronomic value for low environmental impact. Low-chloride, low salt index, neutral pH and no liming effect make it a safe choice even for sensitive crops. 

Is Polysulphate certified organic?

Yes. Mined exclusively by ICL, OMRI-approved Polysulphate is the naturally occurring multi-nutrient mineral, polyhalite. Polysulphate is a natural, granular product licensed for use in organic farming systems (OMRI-approved in the US and Canada), with a particularly low carbon footprint.

How does Polysulphate work? 

Providing a season-long source of plant-available nutrients, Polysulphate’s gradual release pattern safely meets peak plant demand and improves nutrient use efficiency while reducing risks of leaching. Studies show the extended sulfur availability not only increases nutrient uptake, but improves nitrogen use efficiency. Since nutrients are readily available and evenly distributed for optimal plant uptake, Polysulphate is proven to produce a healthier and more productive crop across a wide variety of soil types. 

Polysulphate’s gradual release of sulphate is clear when compared to other fertilizers.

Can Polysulphate be blended with other products? 

Polysulphate is highly compatible with other products. As a multi-nutrient 4-in-1 granule, Polysulphate reduces storage and handling and improves blend and spreadability. It also offers growers a flexible solution, available as powder and granules. The combination of Polysulphate with other nutrients in granulation results in fertilizers capable of providing even more nutrients in a single, extended-availability granule. 

How does Polysulphate interact with different crops?

Research indicates that Polysulphate (polyhalite) enhances yield, crop quality, and nutrient utilization (including nitrogen) across a diverse range of crops and soil types. Its success with various crops like potatoes, alfalfa, corn, soybeans, wheat, strawberries, cotton, and almonds is attributed to its season-long nutrient release profile.

Key benefits across various crops include:

• Season-long nutrient release reduces sulphate losses and extends nutrient availability.
• Plant-available nutrients in sulphate form, facilitating efficient uptake.
• Seed and seedling safety due to low chloride, neutral pH, and low salinity index granules.
• Improved yields, quality enhancements, and increased profits.
• Positive contributions to soil structure, root growth, water infiltration, and seed emergence.

Polysuphate (polyhalite) Trials and Success Stories:

Since 2010, hundreds of global field trials have demonstrated Polysulphate’s efficacy in enhancing crop yield and quality.

• For sensitive crops like canola, Polysulphate serves as a seed-safe option, increasing stand count and improving yield and ROI.
• In potatoes, Polysulphate trials have shown increased marketable and total yields, alongside quality improvements such as reduced hollow heart and better storability.
• Trials on corn and soybeans in North America have highlighted improved value per acre, enhanced nitrogen use efficiency, and increased yields compared to other sulfur sources.
• In almonds, Polysulphate enhances tree health and productivity, providing necessary nutrients for yield and nitrogen use efficiency, resulting in improved kernel size and nut retention. Application post-harvest offers benefits during dormancy for long-term orchard success.