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.
Borealis L.A.T is dedicated to delivering the best quality.
The spreading of granules comprises several stages that involve a large number of parameters:
In each of these five processes, the physical characteristics of the fertilizer play a major role.
The physical characteristics of granulated fertilizers from Borealis L.A.T are optimised to protect them during storage and allow precise and even spreading.
The term physical quality encompasses many physical properties that have an impact on spreading; density, sphericity, hardness, mean diameter, grain size distribution, dust rate, resistance to humidity reabsorption.
That means that physical quality is an essential requirement.
Borealis L.A.T guarantees superior and consistent physical quality across our entire product range.
Uniform distribution depends on even fertilizer output from the disc and overlapping between 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 the curve of the spreading profile is plotted. Spreading regularity is expressed in coefficient of variation (CV), which quantifies the average deviation of doses applied in relation to the mean dose, and is 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:
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.