GP Long 26-4-8

GP Long 26-4-8

GP PREMIUM • CRF TECHNOLOGY

Professional year-round fertiliser with extended action for up to 6 months

Short description: product section

GP Long 26-4-8 is a professional slow-release fertiliser for a single application covering the entire growing season. The exceptionally high proportion of nitrogen coated using CRF technology, with 87 % of total nitrogen enclosed in an organic resin coating, ensures an even nutrient supply to the turf for up to 6 months. Enriched with magnesium and an increased sulphur content (6 %), the formulation supports efficient nitrogen use and photosynthesis.

The product is designed for professional maintenance of sports pitches, golf courses, parks and intensively used green spaces. It is an ideal solution for single-application programmes and as an autumn fertiliser in the three-stage GreenPlan Premium calendar.

Key properties

Professional slow-release fertiliser effective for up to 6 months after a single application;

87 % of total nitrogen is coated for controlled release (CRF), the highest coating proportion in the GP Premium line;

Enables a 6-month plan covering the entire growing season;

Increased sulphur content (6 % S) supports efficient nitrogen use and protein synthesis;

Even nutrient supply to the turf without repeat application;

Reduces growth surges, nutrient losses and the risk of local over-fertilisation;

Reduces the number of maintenance operations, ideal for large sites;

Available in a pack covering 300–500 m² (25 kg).

All-season fertiliser with extended effectiveness

GP Long is a solution for users seeking professional turf care while optimising the number of maintenance operations. The NPK 26-4-8 formulation, with 87 % of total nitrogen coated using CRF technology, was developed for a single application throughout the growing season or, in the traditional three-stage programme, as an autumn treatment preparing turf for winter.

The high nitrogen content (26 %), combined with the highest coating proportion in the Premium line, ensures an even nutrient supply to the turf for up to 6 months. The balanced phosphorus content (4 %) supports stable root development, while potassium (8 %), together with increased sulphur (6 % S), strengthens the grasses' stress tolerance and promotes efficient nitrogen use.

The increased sulphur content is particularly relevant to CRF technology. Sulphur participates in the synthesis of nitrogen-containing amino acids and supports nitrogen metabolism in plant tissue, helping the plant make full use of the nutrient released through the polymer coating.

Within a professional programme, GP Long can be used as the third element of the GreenPlan Premium calendar (autumn fertiliser) or as a standalone all-season solution, replacing two separate applications of GP Frühjahr and GP Standard.

How does CRF technology work?

CRF (Controlled Release Fertilizer) is a fertiliser whose nutrients are released in a controlled way.

In GP Long, 87 % of the nitrogen-containing granules have a specialised organic resin coating, the highest coating proportion in the GP Premium line. After application, moisture penetrates the coating, dissolves the nutrients inside the granule and enables their gradual diffusion into the root zone. The release rate is governed by the coating's properties and environmental conditions, particularly soil temperature and moisture.

CRF technology does not rely on nutrient uptake controlled by plant demand. The coating regulates nitrogen release independently of plant activity. Synchronisation with growth arises because soil temperature and moisture, the key factors governing the coating, also stimulate turf growth.

As a result, nitrogen availability is spread over up to 6 months, enabling a single-application programme with full control over turf nutrition and reduced nutrient losses.

Results of CRF technology

Even nutrient supply to the turf for up to 6 months after a single application;

Avoidance of growth surges throughout the growing cycle;

Significant reduction in nitrogen losses through leaching and emissions;

Lower risk of local over-fertilisation;

More efficient nutrient uptake by the root system;

Greater turf resistance to stress factors such as drought, high temperatures and intensive use;

Fewer maintenance operations, considerably simplifying logistics on large sites;

Predictable agronomic results throughout the effective period.

Applications

Single-application programme for the entire growing season;

Autumn fertilisation, preparing turf for winter dormancy;

Large sites requiring optimised maintenance logistics;

Football pitches, golf courses, grass tennis courts, parks and recreational areas;

High-quality ornamental, prestigious and domestic lawns.

GP Long: application and parameters

Application rate and coverage (25 kg)

Application instructions

Calculate the area to be fertilised and measure the appropriate quantity of fertiliser at the chosen application rate.

Spread evenly on dry turf, preferably using a calibrated spreader.

Avoid overlapping spreading passes and locally exceeding the application rate.

Water the turf after application to initiate nutrient dissolution and movement into the root zone.

Good professional practice

In the single-application programme, apply in spring once soil temperature reaches around 8 °C in the root zone (0–10 cm), usually from the second half of March to April.

In the three-stage programme, apply as autumn fertiliser in September or October before soil temperature falls below 8 °C.

Do not apply to frozen, waterlogged or severely dried-out soil.

On larger areas, two passes in a cross pattern are recommended to distribute the granules evenly.

Adjust the application rate to turf condition, soil conditions and the intended effective period.

Thanks to its extended effectiveness and higher rate, applications can be made 6 months apart without a repeat treatment in between.

Application conditions

Do not apply during frost, drought or strong sunlight. Do not exceed the recommended rate. Adjust the intensity of the fertilisation programme to grass type, soil conditions and use intensity.

Declared composition

Role in the GreenPlan Premium programme

GP Long is the third, autumn element of the GreenPlan Premium fertilisation calendar and an alternative all-season solution:

March / April → GP Frühjahr: start of season, regeneration, effective for up to 3 months

June / July → GP Standard: main season, maintenance of turf density, effective for up to 3 months

September / October → GP Long: winter preparation, effective for up to 6 months

Alternative single-application programme: GP Long can replace two separate applications (GP Frühjahr + GP Standard) with one spring application, with an effect covering the entire growing season. This is particularly effective on large sites and where fewer maintenance operations are required.

Frequently asked questions

When should GP Long be applied? Timing depends on the selected fertilisation programme. In a single-application programme, apply in spring once soil temperature reaches around 8 °C in the root zone. In a three-stage programme, GP Long acts as autumn fertiliser and is applied in September or October to prepare turf for winter dormancy.

Why is the GP Long application rate higher than GP Frühjahr and GP Standard? GP Long supplies turf for up to 6 months, twice as long as GP Frühjahr and GP Standard. The higher rate (50–80 g/m²) provides sufficient nutrients for this entire period, with even release through the CRF coating.

Does the turf need watering after application? Yes. Watering initiates nutrient dissolution, reduces granules remaining on leaf surfaces and supports nutrient movement into the root zone. Watering is particularly important with GP Long because of the higher application rate.

How quickly does it start working? The initial effect is visible within the first few days after application because of the available uncoated nitrogen. The remaining nitrogen coated using CRF technology (87 %) is released gradually over up to 6 months at a rate regulated by soil conditions.

Does GP Long cause growth surges? No. CRF technology, with 87 % of total nitrogen coated, virtually eliminates the risk of growth surges. Nitrogen release is spread across the entire growing cycle, promoting stable, predictable turf development.

When should GP Long be chosen instead of the three-stage programme? The GP Long single-application programme is ideal for large sites, users wishing to optimise maintenance operations and situations where intensive play restricts access to the turf. The three-stage programme (GP Frühjahr → GP Standard → GP Long) allows nutrition to be matched more precisely to the season and turf condition.

Can GP Long be combined with overseeding or renovation? Yes, when applied in autumn. GP Long is suitable alongside autumn overseeding after scarification or aeration. Its extended CRF action supports young seedlings and gradual turf recovery when growth activity is limited.

Is GP Long also suitable for domestic lawns? Yes. Although developed for professional maintenance of large sports facilities and green spaces, it also performs well on prestigious, ornamental and domestic lawns, particularly for users seeking a single application to reduce repeat maintenance during the season.