BASF Agricultural Solutions UK

Limus Clear

Smart science. Proven results.

Developed with our BASF formulation expertise and put to the test in rigorous ADAS Agronomics trials, Limus® Clear is a registered* and innovative urease inhibitor for use with liquid fertiliser (e.g. UAN). By adding to the tank during sprayer filling, when risks of volatilisation are high, Limus® Clear reduces nitrogen losses from liquid fertiliser and helps maximise yield and profitability.

*Registered as a urease inhibitor on the 2003/2003 Fertiliser Directive


  • Proven across 6 ADAS Agronomics trials to deliver an average yield benefit of +0.23t/ha
  • 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 (BBPT + NPPT) for optimal efficacy
 Technical Services Hotline +44 845 602 2553

Technical Services Hotline +44 845 602 2553

Technical Services Hotline

Why Limus Clear?

For a quick overview of Limus Clear, please click here.

Limus® Clear is a highly effective, dual-active urease inhibitor for use with liquid fertiliser.

Six ADAS Agronomics tramline trials in 2019 and 2020 found that Limus® Clear provided an average yield increase of +0.23 t/ha over untreated liquid fertiliser, equating to a MOIC (margin over input cost) of £30/ha, based on a £160/t wheat price.

Only three active ingredients are registered as urease inhibitors under the EU Fertiliser Directive 2003/2003 – NBPT, NPPT, 2-NPT. Limus® Clear contains both NBPT and NPPT and is fully compatible with all liquid fertiliser (straight N and NS grades).

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 .

Nitrogen losses

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.

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.

How Limus® works:

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.

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.

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.