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Proven Longevity
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Uniform blend for even application and consistent performance
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Choice of release characteristics
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Ultimate turf safety in hot conditions (26-0-0 Summer Safe only)
Further information on our controlled release fertilisers
Different nutrient inputs or release characteristics can be achieved depending on your requirements including quick response or slower, steadier release patterns based on the analysis selected.
The mineral polyhalite is a component part of the Sierrablen Mini range. Polyhalite is a naturally occurring mineral fertiliser containing potassium, magnesium and calcium. We have found that the addition of polyhalite into our fertilisers results in improved turf colour, turf quality, turf vigour and growth rates.
Sierrablen Mini fertilisers contain over 60%+ controlled release N in the form of our Poly-S technology.
The Poly-S in Sierrablen Mini is a controlled-release nitrogen source that delivers nitrogen gradually and consistently over a 4 – 5 month period. The nutrient release is primed by moisture permeating through the outer polymer channels, through micro-channels in the sulphur layer and into the nutrient core where the urea is solubilised.
Once the urea is solubilised it is released and made available for plant uptake. This means that the fertiliser is released at an optimum rate for plant uptake and the risk of leaching losses is minimised.
Proven Longevity
Uniform blend for even application and consistent performance
Choice of release characteristics
Ultimate turf safety in hot conditions (26-0-0 Summer Safe only)
Sierrablen Mini is a controlled-release granular fertiliser range designed for 4–5 month longevity. It provides consistent nutrient delivery through ICL’s Poly-S technology, supporting strong, sustained turf growth with reduced leaching risk. The uniform mini-granule size ensures even application and optimal coverage for professional turf surfaces.
Application timing depends on your turf’s seasonal needs:
Its Poly-S coating gradually releases nitrogen, triggered by moisture, giving turf consistent feeding without excessive growth surges. Over 60% of nitrogen is controlled-release, ensuring efficiency and reduced risk of nutrient loss, even in variable weather. Summer Safe’s fully coated formula offers extra safety during high temperatures.
Polyhalite is a naturally occurring mineral included in the formulation. It supplies potassium, magnesium, and calcium—essential for turf colour, vigour, and root strength. This mineral improves turf quality while supporting longer-term soil health, complementing the extended nutrient release from the fertiliser.
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