GP Sport

GreenPlan Sport is a professional range of mineral slow-release fertilisers developed for sports turf, golf courses, grass tennis courts and intensively used green spaces. All products share a common technological core: UF (Urea-Formaldehyde), also known by the German name Formaldehydharnstoff, an advanced form of nitrogen with slow, biologically controlled release.

The GP Sport range is designed as a complete seasonal fertilisation system. Its five products each have a precisely defined role in the annual care cycle of professional turf, from establishment and renovation to in-season maintenance, winter hardening and agronomic grass-species selection.

UF technology (urea-formaldehyde) chemically binds nitrogen in long polymer chains that soil bacteria and fungi gradually break down. Nitrogen release correlates with soil microorganism activity and environmental conditions, specifically soil temperature and moisture.

The fractional composition of UF includes three components with different solubilities and mineralisation rates:

CWS (Cold Water Soluble): the cold-water-soluble fraction, providing a rapid initial response;

CWIN (Cold Water Insoluble): the intermediate-release fraction, providing several weeks of action;

HWIN (Hot Water Insoluble): the long-term nitrogen reserve, providing several months of action.

The result is stable, long-term turf nutrition without growth flushes, alongside reduced nitrogen losses to the environment and a lower risk of local over-fertilisation.

Each GP Sport product is designed for a precisely defined role in the annual turf calendar. The following table provides an overview:

Professional starter fertiliser with a high phosphate content for turf establishment and renovation.

GP Starter was developed for a key phase in the turf life cycle: establishment, renovation overseeding after scarification, or laying turf. Its exceptionally high phosphate content (22% P₂O₅), the highest in the GP Sport range, deliberately focuses on root development, a key factor in successful turf establishment.

Key properties:

22% P₂O₅: the highest phosphate content in the range, crucial for rooting;

2% Fe: an intense, deep turf colour from the first days;

Deliberately reduced nitrogen (12% N): prevents above-ground growth from dominating;

Low chloride: safe for young, sensitive tissues;

7% S: supports nitrogen efficiency and protein synthesis.

Main uses: new seeding, renovation overseeding after scarification, aeration, laying turf and rebuilding thin swards.

Coverage per 25 kg pack: 625–825 m² · Particle size: 1.5–3.15 mm.

Professional seasonal fertiliser with magnesium and iron for intense turf colour.

GP Klassik forms the core of the professional GP Sport care programme. The NPK 20-5-8 formulation, enriched with magnesium, sulphur and iron, is designed for long-term, stable nutrition at every stage of the growing season. Its distinctive feature is a three-stage nitrogen structure: ammonium, urea and UF nitrogen (urea-formaldehyde), providing stable release over up to 3 months.

Key properties:

Three nitrogen forms: ammonium (7.5%), urea (7.5%), UF (5%);

9% sulphur: the highest in Klassik/Allround, supporting nitrogen transformations;

4% MgO + 1% Fe: triple support for turf appearance;

Particle size 1.0–3.15 mm: dust-free, precise application;

Universal use throughout the growing season: spring, summer and autumn.

Main uses: basic in-season turf maintenance, restoring intense turf colour, and sports and golf turf during the playing season.

Coverage per 25 kg pack: 500–825 m² · Particle size: 1.0–3.15 mm.

Professional balanced fertiliser with a complete trace-element complex for resilient turf.

GP Allround is designed for turf requiring a broad nutrient spectrum: NPK macronutrients plus a full trace-element complex essential to stable plant metabolism. Its balanced NPK 16-7-16 formulation, with equal nitrogen and potassium content and five supplementary trace elements, provides a comprehensive response during periods of intensive use.

Key properties:

Complete trace-element complex: boron (B), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn);

High HWIN content (4.2%): long-term action in the second half of the period;

10% sulphur: supports efficient nitrogen use;

Low chloride: safe for sensitive sports turf species;

Particle size 1.0–3.15 mm: dust-free application.

Main uses: comprehensive in-season maintenance, preventing trace-element deficiencies, and sites requiring a broad nutrient spectrum.

Coverage per 25 kg pack: 500–825 m² · Particle size: 1.0–3.15 mm.

Professional phosphate-free functional fertiliser for turf with Poa annua problems and soils with high phosphorus levels.

GP NK is designed for two specific agronomic scenarios: fertilising established turf on soils with high natural phosphate levels, and agronomic control of annual meadow-grass (Poa annua), one of the most problematic unwanted species in professional sports turf.

Poa annua is a phosphate-loving species that actively establishes on soils with elevated phosphorus levels. Limiting soil phosphate availability is one of the most effective agronomic methods of reducing its spread. GP NK supplies nitrogen, potassium and trace elements without simultaneously encouraging Poa annua.

Key properties:

0% P₂O₅: phosphate-free fertiliser, a functional tool for grass-species selection;

20% K₂O: the highest potassium content in the range, alongside GP Finale;

1% Fe, including 0.9% as water-soluble sulphate: intense turf colour;

22% SO₃ + 3% total MgO, including 2% water-soluble: protein and chlorophyll synthesis;

Low chloride: safe for sensitive turf.

Main uses: established turf based on soil analysis, selection programmes against Poa annua, summer and early-autumn sward strengthening, and sustainable fertilisation programmes.

Coverage per 25 kg pack: 833–1,000 m² · Particle size: 2.0–5.0 mm.

Professional autumn fertiliser with high potassium and magnesium content for winter hardening.

GP Finale completes the annual cycle of the professional GP Sport care programme. Its 10-5-20 formulation follows a fundamental turf-agronomy principle: autumn is a time to build resilience rather than stimulate growth. High potassium, magnesium and sulphur contents strengthen grass cell structure, increase natural frost tolerance and reduce susceptibility to fungal diseases in autumn and winter.

Key properties:

20% K₂O: the highest potassium content in the range, alongside GP NK, lowering the freezing point of cell sap;

4% MgO: chlorophyll synthesis as temperatures fall and days shorten;

16.0% TOTAL SULPHUR TRIOXIDE (SO3);

Deliberately reduced nitrogen (10% N): prevents soft, frost-sensitive tissues;

Two application windows: autumn for winter hardening, and summer during heat.

Main uses: autumn sward hardening, summer support during high temperatures and the final stage of the playing season.

Coverage per 25 kg pack: 500–825 m² · Particle size: 2.0–5.0 mm.

The following calendar provides a recommended professional care programme based on GP Sport:

Recommended programme scenarios:

Classic programme: GP Starter as needed → GP Klassik in spring–summer → GP Klassik or GP Allround in summer–autumn → GP Finale in late autumn.

Programme against Poa annua: GP Starter as needed → GP Klassik in spring → GP NK in summer and early autumn → GP Finale in late autumn.

Programme with trace-element supplementation: GP Starter as needed → GP Klassik in spring → GP Allround in summer → GP NK or GP Klassik in autumn → GP Finale in late autumn.

Common features of the GP Sport range:

All products contain nitrogen in UF technology (urea-formaldehyde), with biologically regulated release.

Pack weight: 25 kg.

Country of origin: Germany.

Environmental compliance: microplastic-free.

Application method:

Calculate the area to be fertilised and measure the corresponding fertiliser quantity for the selected rate.

Apply evenly to dry turf, preferably with a calibrated spreader.

Avoid overlapping spreading passes and locally exceeding the application rate.

Water the turf after application: 2–4 mm of water, or 5–10 mm for GP Starter.

Good professional practice:

Apply during active turf growth with a stable soil temperature.

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

On larger areas, two passes in a crosswise pattern are recommended.

Do not apply iron-containing fertilisers (GP Starter, GP Klassik, GP NK, GP Allround) close to light-coloured surfaces because of the risk of permanent staining.

Basic safety instructions:

Do not apply during frost, drought or intense sunlight.

Do not exceed the recommended application rates.

Store in a dry, shaded place below 25 °C.

Keep out of reach of children and animals.

GreenPlan developed GP Sport as a professional response to the real challenges of modern turf agronomy:

Intensive play: sports turf, golf courses, grass tennis courts and commercial sites;

Changing climatic conditions: drought, high temperatures and extreme weather;

Increasing environmental requirements: reduced nitrogen losses, minimised emissions and sustainable fertilisation;

Economic pressure: the need to reduce maintenance operations without loss of quality.

UF technology (urea-formaldehyde) addresses these challenges with long-term, biologically regulated nitrogen release, stable agronomic results, environmental safety and operational efficiency. The five products form a complete care system, each with a precisely defined role from establishment to winter dormancy.

GreenPlan Sport: professional systems for turf of the highest quality.