CRF: Controlled Release Fertilizers
A new generation of precision fertilisation
CRF fertilisers (Controlled Release Fertilizers) form the foundation of modern fertilisation systems for professional turf. This technology relies on controlled, gradual nutrient release matched to plants' actual requirements and the surrounding environmental conditions.
Unlike conventional fertilisers, CRF fertilisers provide full control over the rate and duration of nutrient availability, eliminating growth flushes, nutrient losses and the risk of over-fertilisation.
How does CRF technology work?
CRF granules have a specialised, multilayer polymer coating that:
Reacts to soil temperature and soil moisture,
Regulates the rate of nutrient diffusion,
Provides an even nutrient supply over many weeks or months.
This mechanism supplies nutrients to the turf precisely when they are needed, rather than all at once after application.
Benefits of CRF technology in GreenPlan systems
Using CRF fertilisers in GreenPlan programmes provides specific operational benefits:
Stable, controlled turf growth without abrupt growth flushes;
Longer action from a single fertiliser application;
Significantly reduced nitrogen losses to the environment;
Lower risk of leaching and emissions;
More efficient nutrient uptake by the root system;
Greater turf resilience to stress, including drought and intensive use.
CRF in practice
GreenPlan CRF fertilisers are designed for:
Football pitches meeting top-division standards;
Golf courses and driving ranges;
Grass tennis courts;
Urban parks and recreational areas;
Residential and commercial properties with intensive use.
This technology is selected wherever results need to be predictable, long-lasting and safe.
CRF in GreenPlan fertilisers
This is the solution for professionals who expect:
Stability,
Precision,
Complete control over the turf's growth process.
Within GreenPlan systems, CRF technology is a strategic tool for managing turf quality.
FROM KNOWLEDGE TO PRODUCT
Related products.

GP Long 26-4-8
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GP Standard 24-6-12+3
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GP 20+5+8 (+2) + Iron
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Compare product data
| Product | Product data |
|---|---|
| GP Long 26-4-8 | Total nitrogen (N): 26 % Of which ammonium nitrogen: 3.0 % Of which urea nitrogen: 23.0 % Phosphate (P₂O₅): 4 %; of which 3.7 % is water-soluble Potassium oxide (K₂O): 8 %, water-soluble Magnesium oxide (MgO): 2 %, water-soluble Sulphur (S): 6 %, water-soluble Coated nitrogen: 87 % of total nitrogen (organic resin coating) |
| GP Standard 24-6-12+3 | Composition: NPK 24-6-12 + 3 % MgO + 2.4 % S Application rate: 25–40 g/m² Coverage per 25 kg pack: 625–1.000 m² Duration of action: Up to 3 months Granule size range: 2.0–4.0 mm Application timing: Main growing season (May to August), on actively growing turf with stable root-zone (0–10 cm) soil temperature above 10 °C Total nitrogen (N): 24 % Of which nitrate nitrogen: 4.0 % Of which ammonium nitrogen: 1.5 % Of which urea nitrogen: 19.0 % Phosphate (P₂O₅): 6 %; of which 5.8 % is water-soluble Potassium oxide (K₂O): 12 %, water-soluble Magnesium oxide (MgO): 3 %, water-soluble Sulphur (S): 2.4 %, water-soluble Coated nitrogen: 50 % of total nitrogen (organic resin coating) |
| GP 20+5+8 (+2) + Iron | Total nitrogen (N): 20.0 % Ammonium nitrogen (N): 7.5 % Urea nitrogen (N): 7.5 % Urea formaldehyde (N): 5.0 % Cold-water-soluble (N): 2.6 % Soluble only in hot water (N): 1.9 % Neutral ammonium citrate-soluble and water-soluble phosphate (P₂O₅): 5.0 % Water-soluble phosphate (P₂O₅): 3.5 % Water-soluble potassium oxide (K₂O): 8.0 % Total magnesium oxide (MgO): 2.0 % Total iron (Fe): 1.0 % Granule size: 2.0–5.0 mm Duration of action: Up to 3 months Net weight: 25 kg Coverage: 500–825 m² Applications: Football, golf, ornamental and utility turf |
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