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The four-in-one natural fertilizer

Exploring the production of Polysulphate

Polysulphate® is the world’s only natural 4-in-1 fertilizer and a key component of ICL’s PLUS family of fertilizers, designed to improve crop yields.

Mined in the UK in its natural crystal state (polyhalite), Polysulphate contains four essential nutrients: sulfur (S), potassium (K), magnesium (Mg), and calcium (Ca), all in sulfate form.

Polysulphate has a natural, unique dissolution pattern that releases nutrients gradually after application. This prolonged availability is a real plus for growers, as it reduces nutrient losses while also matching nutrient availability to the uptake requirements of crops. The net result, backed up by extensive crop trials, is that Polysulphate increases the nutrient use efficiency of crops, increasing their yield and crop quality.

Polysulphate stands out as an eco-friendly choice for farmers. With its natural composition – it is simply mined, crushed, and screened – Polysulphate has an exceptionally low carbon footprint. In fact, Standard, Granular, and Mini Polysulphate have the lowest carbon footprint (compared to similar products) of just 0.0029 kilograms of CO2 equivalent per kilogram of product, clearly setting Polysulphate apart from other fertilizers. Polysulphate sets the standard in environmental sustainability among fertilizers.

With certification agencies around the world, including Ecocert, Ceres, Control Union, and OMRI, approving Polysulphate for organic farming systems, growers for traditional and organic markets can benefit from the PLUS of using Polysulphate.

ICL Polysulphate: Always look for the PLUS.

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Latest addition to the Polysulphate® Range

Polysulphate® Premium

Premium: Polysulphate® Premium consists of uniform, robust spheres of Polysulphate®, whose smooth surfaces protects it from abrasion, humidity, and damage. Its spherical shape ensures a steady flow rate and a consistently broad spread during application. It blends with other granulated fertilizer materials.

Benefits

  • Four essential nutrients in one application

  • Available in powder and granular forms

  • Delivers extended, season-long nutrient availability, with fewer sulfate losses through leaching

  • All nutrients available for uptake in sulfate form

  • Ideal for all crops and soil conditions

  • Low chloride

  • Neutral pH

  • Low salinity index

  • Completely natural product with a low carbon footprint

  • Polysulphate® is approved for use in organic agriculture

  • Produces higher yields, improved plant quality, plus bigger profits

  • Concentrated product, easy to store and easy to spread

Product range

Product name
N
P2O5
K2O
More nutrients
Longevity

Premium

Premium: Polysulphate® Premium consists of uniform, robust spheres of Polysulphate®, whose smooth surfaces protects it from abrasion, humidity, and damage. Its spherical shape ensures a steady flow rate and a consistently broad spread during application. It blends with other granulated fertilizer materials.

Granular Polysulphate

Granular: Polysulphate® granules for direct application with spreaders and bulk blending.

Standard Polysulphate

Standard: Polysulphate® fine grade has NPK granulation and is designed for direct manual application.

Mini

Mini: The granules are 1-2mm in size, which helps the practical application of Polysulphate®, especially in greenhouses and horticultural settings. It’s easy to apply directly via manual or mechanical spreading, while you can mix it with other fertilizers of a similar size.

Guides & Articles

Polysulphate - from polyhalite to fertilizer and mine to fields
Video

Polysulphate - from polyhalite to fertilizer and mine to fields

Exploring recommended crops

This brand is suitable for all types of crops, such as:

Everything you need to know about avocado fertilization, best practice, suitable products, field trials and more

Complete guide to Avocado

Everything you need to know about fertilizing potatoes, best practice, suitable products, field trials and more.

Complete guide to Potato

Everything you need to know about wheat fertilization, best practice, suitable products, field trials and more

Complete guide to Wheat

Everything you need to know about alfalfa fertilization, best practice, suitable products, field trials and more.

Complete guide to Alfalfa

Everything you need to know about grass or grass-clover mixture fertilization, best practice, suitable products, field trials and more.

Complete guide to Grass

Q&A

Frequently asked questions we received from farmers.

All nutrients are in sulfate form.

Polysulphate is produced from a natural mineral called polyhalite, which is an evaporite mineral, a hydrated sulfate of sulfur, potassium, calcium and magnesium.

It is mined from the Polyhalite layer of rock, over 1000m below the North Sea, off the North Yorkshire coast in the UK. Polyhalite and undergoes a simple process of crushing and screening the rock and is then marketed as Polysulphate.

Polysulphate is available in its natural form. Preparing it for the market as Polysulphate involves no chemical separation or other industrial processes – it’s completely natural, organic and sustainable. Polysulphate has been approved by many global and national bodies for organic use.

Polysulphate dissolves steadily in the soil solution, thus having all nutrients available for plant uptake during the growth period. Being a natural crystal, it has a unique dissolution pattern, which releases its nutrients gradually after being applied to the soil. The prolonged release characteristic of Polysulphate means that as the four nutrients it contains are released, and they provide a continuing continuous, fresh source to the growing crop. This pattern matches the uptake timing of nutrients by the crops and minimizes the risk of loss of sulfate by leaching.

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