A new partnership delivering the Diamond Standard in Crop Nutrition - Thomas Bell & Sons are proud to collaborate with Anglo American to introduce Diamond Fertilisers powered by POLY4 — a new generation of premium fertiliser designed to deliver balanced nutrition and maximise sustainable crop yield.  This partnership combines Thomas Bell’s expertise in precision blending and Anglo American’s naturally sourced multi-nutrient fertiliser, POLY4, creating a range that meets the needs of modern UK agriculture.  Together, we are helping farmers achieve more - sustainably.  

‍What is POLY4?
POLY4 is a naturally occurring multi-nutrient fertiliser derived from the mineral polyhalite, mined by Anglo American in the UK.
It provides four essential nutrients that are vital for healthy crop growth:
• Potassium (K) – supports yield and quality
• Calcium (Ca) – strengthens cell walls and improves crop resilience       
• Magnesium (Mg) – boosts chlorophyll and photosynthesis
• Sulphur (S) – enhances nitrogen uptake and protein formation

POLY4 releases these nutrients steadily and naturally, improving nutrient use efficiency while maintaining soil structure and fertility.  

Why Choose Diamond Fertiliser Powered by POLY4?
Diamond Fertilisers have long been trusted for their quality and consistency. By integrating POLY4 into our blends, we’ve raised the standard - offering farmers premium nutrition with proven performance across every acre.  

Key Benefits:
• Balanced, multi-nutrient nutrition in every granule
• Improved soil health and structure
• Enhanced nutrient efficiency and crop uptake
• Naturally low carbon and chlorine-free
• Compatible with N and P-based blends for complete nutrition