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

£50.40 inc VAT £42.00 ex VAT
QTYPrice per itemSaving
1 - 9 £50.40 £42.00
10 - 19 £49.20 £41.00 3%
20+ £48.00 £40.00 5%
  • 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.

Full Description

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 

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.

Technical Specification

ProductProloNg 20-4-20+TE Slow Release Fertiliser 20kg
Spreading Rate50g per m²
Period Of UseAutumn, Spring, Summer
Pack Size20kg
Active Ingredient20% nitrogen, 4% phosphate, 20% potassium, 3% calcium, 1.5% magnesium & 8% sulphur
Application MethodSpreader, Spread By Hand
Area of UseLawns, Sports Turf, Trees, Ornamentals, Amenity Turf
Pack Size Coverage400m²
Safe For Use OnGrass, Lawns, Sports Turf, New Grass, Around Fruit Trees, Conifer Safe, Around Shrubs, Around Trees
Granule Size2-5mm (Maxi)

Product Calculator

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 product calculator - which will tell you how much product you require.


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

£50.40 inc VAT £42.00 ex VAT
QTYPrice per itemSaving
1 - 9 £50.40 £42.00
10 - 19 £49.20 £41.00 3%
20+ £48.00 £40.00 5%
Click & CollectIn Stock for Click & Collect
DeliveryIn Stock for Next Day Delivery
DeliveryIn Stock Delivery or Collection
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