Senior Expert with over 15 years of experience in the fertilizer industry
Uniform distribution depends on an even fertilizer output and
consistant overlapping between the two passes (out and back) of the
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 a yield and protein reduction. Too high a
dose than the economic optimum causes a loss in revenue and increases
the risk of nitrogen loss.
Precise spreading of solid fertilizer (CV < 10%) means that over 90% of the granules have landed in the right place. That level of precision means that 1 gram of nitrogen per square metre can be applied to achieve 100kg per hectare. Such precision is only available with high-quality homogeneous fertilizers such as those from Borealis L.A.T.
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.
Especially the granular AN 33.5 N from Borealis L.A.T fulfills the mentioned requirements to achieve such a good CV.
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.
Up to 25km/h
More than 19 days
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.
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.
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
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.