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EXCELLENT PHYSICAL QUALITY CHARACTERISTICS FOR PRECISE SPREADING

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:

  • 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. 


PHYSICAL CRITERIA
PHYSICAL CRITERIA
SPREADING PRECISION
SPREADING PRECISION
ALL IN ONE
ALL IN ONE
SPREADER ADJUSTMENTS
SPREADER ADJUSTMENTS
Physical criteria

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.

Spreading precision

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:

  • A CV between 0% and 10% is good
  • A CV between 10% and 15% is medium
  • A CV above 15% is poor


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.

POOR SPREADING
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 the plants, and thus a reduction in yield and protein content. A dose higher than the economic optimum causes loss in revenue and increases the risk of unproductive nitrogen loss.
HIGH PHYSICAL QUALITY OF NPK+S
High physical quality is also essential for compound granulate fertilisers. The NPK+S compound granulate formulations from Borealis L.A.T offer a combination of nutrients within each granule for balanced nutrition. Their composition covers all the nutritional needs of main crops throughout their growth cycle.
Unlike mixed/blended fertilizers, complex fertilizers do not get segregated when being stored, transported to the field and spread. Segregation leads to uneven spreading, and nutrition disparities. The difference can be up to 30 to 40% variation in mixtures with granulated-compacted fertilizer. Irregular spreading is made visible by alternate light and dark strips in the field which lead to variation in yield. Furthermore, the compound fertilizer facilitates a denser distribution (more granules per plant) in the field compared to fertilization with straights or bulk blends.
Adjusting your spreader
To ensure precise spreading and thus even distribution for effective nutrition, it is crucial to adjust the spreader correctly. The fertilizer ranges from Borealis L.A.T are referenced for spreaders from major manufacturers.
Information about the factory origin is also provided. 
Based on the information provided on the bags (before the batch number) in manufacturer’s databases, the origin is specified as follows:
  • “GP” for Borealis Grandpuits
  • “GQ” for Borealis Grand-Quevilly
  • “OTT” for Borealis Ottmarsheim
  • “St.-Peter-Straße 25, 4021 Linz” for Borealis Linz

Note that the manufacturing plant is also stated on the documents accompanying the product.