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Agrigem Specialist Amenity Products and Services

ProloNg 20-4-20+TE Slow Release Fertiliser 20kg

ProloNg 20-4-20+TE Slow Release Fertiliser 20kg
£63.60 Inc VAT £53.00 Ex VAT
  • Buy 5 for £51.00 (£61.20 incl. tax) each and save 4%
  • Buy 10 for £49.00 (£58.80 incl. tax) each and save 8%

Availability: In stock

6 Month Release Fertiliser

Delivery Costs Calculated At Checkout
Click & Collect available

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Key Information

Additional Information

Active Ingredient20% nitrogen, 4% phosphate, 20% potassium, 3% calcium, 1.5% magnesium & 8% sulphur
LERAP CategoryDoes Not Apply
Pack Size20kg
Pack Size Coverage400m2
Granule Size2-5mm (Maxi)
Spreading Rate50g per m2
Application Method(s)Spread by Hand, Spreader
Area of UseAmenity Turf, Lawn, Sports Turf, Trees & Ornamentals
Safe For Use OnConifer Safe, Grass, Lawns, New Grass, Safe Around Fruit Trees, Safe Around Shrubs, Safe Around Trees, Sports Turf
Period Of UseMarch, April, May, June, July, August, September, October, November, Spring, Summer


ProloNg 20-4-20+TE is a quality NPK fertiliser which will slowly release over a 4-6 month period. Allowing the plant to draw on available nitrogen over a longer period of time is far more efficient & reduces the amount of nitrogen lost to the atmosphere. The slow release nature of ProloNg 20-4-20+TE also reduces the sudden surge of top growth usually associated with high nitrogen products; instead of rapid growth the effects of this fertiliser will be manageable and still leave your lawn looking healthy and lush.

ProloNg 20-4-20 contains three vital macronutrients- nitrogen, phosphate and potassium. Each of these macronutrients have their own benefits; nitrogen aids with photosynthesis, phosphate helps plants convert other nutrients into usable building blocks with which to grow and potassium regulates CO2 uptake during photosynthesis.

If you require a product which doesnt release for quite as long, consider 18-3-8 Slow Release.

Understanding Fertiliser Analysis: 

- Under the metric system the unit of measurement is a kg. 

- Recommendations are given in kg/ha. 

- A fertiliser with the analysis 20-4-20-+1.5Mg 

contains: 20% nitrogen, 4% phosphate, 20% potassium, 1.5% magnesium.

- So in a 25kg bag: 20% of the 25kg is nitrogen i.e. 5kg N, 4% of the 25kg is phosphate i.e. 1kg P, 20% of the 25kg is potassium i.e. 5kg K, 1.5% of the 25kg is magnesium i.e. 0.375kg.

- For more information on Fertiliser rates visit

Key Benefits:

- Improved utilization and plant take up of applied nitrogen

- Reduction in wasted nitrogen resulting in improved cost efficiency and reduced environmental impact.

- Season long performance.

- Reduces unwanted growth flushes.

- Reduces soft lush growth and disease susceptibility.

- Reduced chance of scorching.

Our Recommendation:

- Always read the product label before use.

- Apply ProloNg 20-4-20+TE at 3–6 month intervals.

- If you require a liquid alternative consider Slow N.

- Look at our Heavy Duty Spreader or Pro Fertiliser Spreader.

- Improve the pH of your soil by applying Granulated Lime.

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How much ProloNg 20-4-20+TE Slow Release Fertiliser 20kg will you need?

Purchase the correct amount of product for your requirements with our material calculator - which will tell you how much product you require.

You will need: Containers

Calculator Disclaimer This is guide only, For crop specific rates please check the product label.

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