Want to secure an excellent CV?

"Achieve better yields as a result of evenly distributed spreading patterns with granular AN"

Tom Holt
Senior Expert with over 15 years of experience in the fertilizer industry

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Comparison of CV between prilled AN and L.A.T granular AN 33.5 N

Compared to a prilled product, granular AN from Borealis L.A.T always offers a better coefficient of variation (CV) at all spreading widths and for all wind speeds.


Uniform distribution depends on an even fertilizer output and consistent overlapping between the two passes (out and back) of the broadcasted fertilizer granules.
To test the regularity of fertilizer spreading, the actual dose of fertilizer spread over the projecting distance is measured and then plotted. Spreading regularity is expressed as "coefficient of variation (CV)", which quantifies the average deviation of doses applied in relation to the mean dose. The result is then stated as a percentage. CV, as defined in European Standard 13739, is the ratio between the standard deviation and the mean total distribution.
The lower the CV, the better the distribution. The quality of fertilizer distribution is expressed as follows:

A CV between 0% and 10% is excellent
A CV between 10% and 15% is good
A CV between 15% and 20% is poor
A CV above 20% is unacceptable


Imprecise spreading can have serious consequences. It is often visible in strips or waves, showing 30% over or under-dosing. Uneven and imprecise distribution of fertilizer leads to nutrition deficiencies in the plants, resulting in yield and protein reduction. Too high a dose than the economic optimum, causes a loss in revenue and increases the risk of nitrogen loss.

In windy conditions, prilled AN cannot be spread up to 36m with a correct CV. Uneven spreading will result in yield loss. At 36m, only granular AN offers a superior CV, even in windy conditions.

The following factors are important for even spreading

When spreading with a centrifugal distributor, it is very important to consider the overlap distance in order to ensure an even distribution. This is because the concentration of granules decreases as the distance from the spreader increases. The speed of driving also influences the distribution.


The physical characteristics of granulated fertilizers have a significant influence on the spreading pattern by affecting the behaviour of the granule in the spreader and the way it travels through the air. It is important that these properties do not alter during storage.
The evenness and precision of spreading depends directly on the quality of the fertilizer. Particularly when applied with broadcast spreaders at wide working widths, the fertilizer must have clearly defined and consistent physical characteristics.

The spreading of granules comprises several stages that involve a large number of parameters:

  • Descent of fertilizer into the hopper
  • Catching of fertilizer by the blades
  • Fertilizer travelling along the blade
  • Ejection of fertilizer at a given angle and speed
  • Ballistic flight of fertilizer granules

In each of these five processes, the physical characteristics of the fertilizer play a major role.

Excellent supply chain

Our facility at Grand Quevilly has undergone huge investment over the last 2 years.  Increasing its production and export capabilities has allowed us to meet the demand throughout Europe for good quality Nitrogen products without compromising product integrity.

Closely situated to the UK market, we have the ability to ship vessels from Grand Quevilly in a quick and efficient manner and have developed and grown strategic relationships in order to ensure continuity of supply to UK growers throughout the year.

Beyond 36m

Up to 25km/h

More than 19 days

Beyond 36m

Compared to prilled products, Granular AN from Borealis L.A.T offers a better coefficient of variation (CV) at all spreading widths and at all wind speeds. In windy conditions prilled AN cannot be spread up to 36m with a correct CV and uneven spreading will lead to yield loss. At 36m, only Granular AN offers a good CV even in windy weather.

Up to 25km/h

At 25 km/h crosswinds the tests show that Granular AN 33.5 still maintains a good spreading pattern and a correct CV, unlike the prilled products. This unique benefit of Granular AN is giving the farmers confidence to go out spreading while achieving good results.

More than 19 days

3 times more days of applications in the spreading season is only assured by Granular AN 33.5. UK weather makes the farmers work schedule hard to maintain consistently. During the high season there are only 6 days with wind speeds below 15km/h, but with Granular AN farmers can spread confidently an additional 13 days when the wind speed is up to 25 km/h.

Prilled AN or Granular AN? What insures better spreading & yield?

We wanted to find out what the best fertilizer type for the UK farming landscape, so we reached out to SCS to get an expert view. Watch the video now to see what we learned.

Take a look at all the advantages of Granular AN