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Revolutionising crop nutrition

Polyhalite is a groundbreaking solution for high-value crop nutrition. This naturally occurring mineral is packed with essential nutrients to help crops thrive —potassium, sulphur, magnesium, and calcium, making it a perfect choice for sustainable agriculture.

Through a simple process of crushing and granulating, we transform Polyhalite into POLY4, our flagship, low-carbon, multi-nutrient granulated fertiliser designed for both conventional and organic farming.

By delivering a more balanced and sustainable approach to fertilisation, POLY4 empowers farmers to achieve results while reducing the risk of waste and loss across the farm.

With POLY4, we're not just fertilising crops—we're cultivating a more sustainable future for global agriculture.

About POLY4

POLY4 has several benefits needed for more sustainable and productive cropping systems:

Helps improve yield and quality

POLY4 trials have shown a variety of quality improvements and overall, a median yield uplift of 3-5% globally, when compared to standard NPK and NPKS fertilisation programmes.

3-5% Yield Uplift (median) - compared to standard NPK and NPKS

Sustained nutrient release

POLY4 releases available nutrients gradually, for longer availability over the growing period. The sustained release profile offers growers more flexibility of application timing.

Nutrient use efficiency

POLY4 trials have typically shown greater nutrient uptake, allowing growers to optimise nitrogen rates and better manage their inputs.

Nutrient use efficiency (NUE) refers to the effectiveness at which plants use applied nutrients for growth and development.

POLY4’s neutral pH and combined team of nutrients including K, Mg, Ca and S, create ideal conditions for supporting improvements in NUE.

Optimising nitrogen use

POLY4 provides nutritional tools to effectively optimise nitrogen (N) from both chemical and organic sources.

Better N efficiency can be achieved during conversion of total available N, provided from soil and fertilisers, into proteins. The nutrients supplied by POLY4, help drive nitrate conversion and protein metabolism

Supporting healthy soils

POLY4 is low in chloride, with a low salt index and a neutral pH, with no harmful effects on the delicate soil ecosystem. POLY4 contains an essential team of nutrients which support soil health. The calcium in POLY4 helps improve soil structure by bridging soil organic matter with clay particles.

We incorporated POLY4 to help increase nutrient use efficiency. Nitrogen rates have been reduced by a third, without incurring a yield penalty.

Colin Chappell UK Farmer

Driving more productive, sustainable farming

Fertilisers replace the soil nutrients lost when a crop is harvested. But incorrect use of fertilisers can have negative effects on the soil and the wider environment, so more sustainable practices must be found.

All plants use the same 17 essential elements to grow and survive. In order to obtain optimum growth and health, while preventing unintended environmental consequences, the right quantity of the right nutrients must be available at the right time and in the right place.

POLY4 is perfectly suited to the need for this more effective, efficient and sustainable farming. It slowly releases a broad range of nutrients so they are available when the plant needs them most, whilst improving the health of the soil. This more balanced and nutritious diet makes plants stronger, healthier and more productive, and creates a stronger soil structure with a more favourable environment for soil biology, improving erosion and nutrient leaching.

POLY4 is low in waste due to the almost 1:1 ore to product ratio and has a low carbon footprint compared to conventional chemical fertilisers.

The impact of polyhalite in the soil

Neil Fuller

Polyhalite and its impact on soil and crop

Listen to independent agronomist Neil Fuller talk about the positive impact of polyhalite on soil and his hopes for the mineral fertiliser.

The market for POLY4

POLY4 will be a high value product offering benefits to farmers beyond its nutrient value. It will be used as a substitute for, or complement to, existing fertilisers to not only boost crop yield but offer wider soil and environmental benefits.

Consumer, supply chain and global government expectations for improving the sustainability of the food chain are increasing. Trends including a growing global middle-class population (and therefore increased consumption of agricultural products), increasing soil nutrient deficiencies (for example of sulphur and magnesium) and diminishing arable land per person are increasing the need for large-scale production and use of multi-nutrient fertilisers.

POLY4 is expected to attract demand in the global fertiliser market as a result of its superior performance and environmental impact compared to traditional chemical fertilisers, including its low carbon emissions, enhanced nutrient use efficiency and organic certification.

Find out more at poly4.com about The market for POLY4 page

POLY4's performance

Our global agronomy programme provides technical, agronomic and commercial validation for POLY4’s use as an effective multi-nutrient fertiliser suitable for widespread use in commercial farming.

These studies test POLY4 on broad acre and high value crops directly against other potassium based fertilisers, both as a straight comparison and as a component in an NPK blend. Results consistently show that POLY4 outperforms other fertilisers in both crop yield and quality, demonstrating the agronomic advantage provided by POLY4's multi-nutrient content.