POLY4 contains:

• 14% Potassium (K₂O)

• 48% Sulphur (SO₃)

• 6% Magnesium (MgO)

• 17% Calcium (CaO)

These are four of the six essential macronutrients required by crops.

POLY4 is a natural multi-nutrient fertiliser made from the mineral polyhalite. It contains four essential crop nutrients: potassium (K), sulphur (S), magnesium (Mg) and calcium (Ca).

Polyhalite is a naturally occurring mineral formed millions of years ago through the evaporation of ancient seas. It contains potassium, sulphur, magnesium and calcium in a natural crystalline structure.

POLY4 is produced by mining natural polyhalite, then crushing and granulating it. No chemical processing is required, helping to maintain its natural characteristics and low environmental footprint.

POLY4 has a multitude of benefits that continues to grow as we further understand the mineral and how it performs across a wide range of trials and scientific experiements.

POLY4 helps growers:

• Improve crop yield and quality

• Enhance nutrient use efficiency

• Support healthy soil structure

• Increase crop resilience to stress

• Improve sustainability of farming systems

Yes. Thousands of global field trials have demonstrated yield and quality improvements across a wide range of crops. We conservatively report a median yield uplift of 3-5% compared with standard NPK and NPKS fertilisation programmes.

Yes. POLY4 provides a sustained nutrient release profile, allowing nutrients to become available throughout the growing season and giving growers greater flexibility in application timing.

Yes. POLY4 has a neutral pH, low salt index and low chloride content. It contributes essential nutrients without negatively impacting beneficial soil biology or structure.

The calcium component helps bind soil particles and organic matter, improving soil structure and supporting water and nutrient movement within the soil.

Yes. POLY4's natural origin, balanced nutrition and low environmental footprint make it well suited to regenerative and sustainable farming approaches.

POLY4 has been successfully tested on more than 75 crops worldwide, including cereals, potatoes, oilseed rape, vegetables, fruit crops, vineyards, grassland and horticultural crops.

Yes. POLY4 can be used alone or incorporated into NPK blends and other fertiliser programmes to provide balanced crop nutrition.

POLY4 offers flexible application timing thanks to its gradual nutrient release profile. Application timing can be adjusted according to crop requirements, soil conditions and overall nutrient management plans.

Application rates vary depending on crop type, soil nutrient status and yield targets. Typical rates range from 150 to 600 kg/ha depending on the crop. Growers should seek local agronomic advice for specific recommendations.

POLY4 is a naturally occurring mineral fertiliser requiring minimal processing. Its production avoids the chemical manufacturing processes associated with many conventional fertilisers and has a lower carbon footprint.

POLY4's sustained nutrient release helps improve nutrient availability throughout the growing season, supporting better nutrient use efficiency and reducing waste.
POLY4 also improves the structure of soils helping them limit the amount of run-off. The sulphur in POLY4 also helps mobilise the nutrients in the ground ensuring more is available to the plant.

Yes. By improving nutrient efficiency, supporting soil health and providing balanced nutrition, POLY4 can contribute to more resilient and sustainable farming systems.

Yes. POLY4 is a naturally occurring mineral fertiliser that is approved for use in many organic production systems. Growers should always check local certification requirements.

POLY4 has a naturally low chloride content, making it suitable for a wide range of crops, including those that are sensitive to chloride.

Yes. POLY4 can be used in both conventional and organic farming systems and complements existing fertiliser programmes.

Unlike many conventional fertilisers that provide a single nutrient, POLY4 supplies four essential nutrients in one granule, helping to simplify nutrient management while supporting productivity and sustainability goals.

Contact your local POLY4 representative, agronomist or distributor for tailored advice on application rates, crop suitability and fertiliser planning. Based on over 2,500 global trials and more than a decade of research, there is extensive technical information available to support growers.

POLY4 is sold via distribution partners across key regions in UK, Ireland, Europe, China, India, USA and Brazil currently. Please contact the team who will be able to put you in contact with the relevant partner.