BASF Agricultural Solutions UK
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Limus Clear


Limus® Clear is a new urease inhibitor for use with liquid fertiliser (UAN) that minimises nitrogen losses and supports optimal nitrogen availability for your crop.


  • Improves nitrogen use efficiency (NUE) by minimising nitrogen losses from ammonia volatilisation
  • Reduces ammonia emissions by up to 98%
  • Increases yield compared to untreated liquid fertiliser (UAN)
  • Contains two actives (NBPT + NPPT) for optimal efficacy

Product Profile:

Active ingredient(s)NBPT (N-butyl-phosphorothioic triamide)
NPPT (N-propylyl-phosphorothioic triamide)
FormulationColourless liquid
Pack size5 litres in outers of four
CropsAny crop treated with UAN (urea ammonium nitrate)
Rate of use1.0 litre per 1000 litres UAN
Timing of useWhenever UAN is applied to the crop. Limus® Clear is particularly effective when temperatures are warm with no rainfall in the 7 days after application, on alkaline soils and on dry soils.

Why Limus® Clear?

Nitrogen can be lost as ammonia following the application of liquid fertiliser (UAN). UK research suggests average nitrogen losses from UAN range from 11-14%. The amount of nitrogen loss in this research was dependent on environmental conditions, including soil water content, soil temperature and rainfall.

In general, factors that increase the risk of ammonia (nitrogen) losses include

  • Warm temperatures
  • Dry soils
  • Less than 10mm of rainfall with 48 hours of application
  • Alkaline (high pH) soils
The use of Limus® Clear is recommended when the risks of nitrogen losses are high. Limus® can reduce these losses by up to 98%, improving nitrogen use efficiency (NUE) on farm, whilst reducing ammonia emissions.

Ammonia is an air pollutant, which is currently being targeted by the government’s ‘Clean Air Strategy’. The Code of Good Agricultural Practice (COGAP) for reducing ammonia emissions supports the use of urease inhibitors with urea-based fertilisers as one way of reducing ammonia. In the future, legislation may be introduced which makes this use compulsory.

Find out more about Limus Clear from Frontier’s National Crop Nutrition Technical Manager, Ed Downing, here and from a Limus Clear 2019 trial farmer and 2020 user, James Faulkner, here

Limus® increases yield of UAN

By reducing ammonia emissions, more nitrogen is available for crop uptake.

Across 21 BASF trials on a range of crops, this resulted in a 4% increase in yield, compared to liquid fertiliser without the addition of Limus® Clear.

How do urease inhibitors work?

Urea is not readily plant available and first needs to be converted into ammonium. This is done by urease enzymes in the soil that bind to the urea. Without sufficient rainfall post application, the ammonium concentration around the site of application increases, leading to a localized increase in soil pH. This converts the ammonium to ammonia gas. Urease inhibitors temporarily bind to these enzymes, preventing the localised pH spike and reducing the losses of ammonia.

What makes Limus® Clear unique?

Different urease enzymes require different urease inhibitors. Limus® is the only urease inhibitor available with two active ingredients (NBPT and NPPT), enabling it to bind to a wider variety of urease enzymes and more effectively minimise losses.

Limus® Clear Summary Sheet

Limus® Clear Summary Sheet

For an overview of Limus® Clear and application rates, please find a summary sheet here.



If you want to stop profits escaping, start by choosing Limus.

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Limus Clear in 2020

Limus Clear in 2020

Find out how Limus Clear may be well suited to this season from Frontier’s National Crop Nutrition Technical Manager, Ed Downing.

Discover more
A Limus Clear User

A Limus Clear User

Find out how Essex farmer, James Faulkner, got on with Limus Clear in some 2019 trials and what his plans are for this year.

Discover more
 Technical Services Hotline +44 845 602 2553

Technical Services Hotline +44 845 602 2553

Technical Services Hotline

Compatibility list

Click here to take a look at our latest compatbility list

Click here to download the compatibility list