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Granulometry

It's what we do

Granulometry is a crucial factor influencing how well a fertiliser spreads, how quickly it releases nutrients, and how effective it is overall. Understanding granulometry helps ensure even nutrient distribution, efficient application, and optimal plant uptake. The SGN of our granular fertilisers are also important, as similar size and shape spread more evenly across turf, leading to consistent application and minimising under- or over-fertilised areas.

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Granule Dispersal

Granule dispersal is the amount of time and additional inputs such as watering that a granule product takes to break down and disperse into the soil.

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Turf Response

Turf Response relates to the time taken for the plant to uptake nutrients and show a visible effect. All fertilisers can have a different response depending on the watering, soil conditions, weather and nutrient availability (source of N).

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Granule Size

Granule size is important to ensure optimum distribution of fertiliser for accurate application and the ability to apply at low application rates such as 10-15g/m2 to guarantee correct input of nitrogen.

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Longevity

Longevity is the time a fertiliser is effective for. This can be influenced by moisture, temperature, type of fertilisers i.e. granular or liquid and the specific product ingredients.

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SGN

The Size Guide Number (SGN) is a measure of the average particle diameter of granular fertilisers, calculated by multiplying the average particle diameter in millimeters by 100. For instance, an SGN of 80 indicates an average particle diameter of 0.8 millimeters.

Here's how to calculate SGN:

  1. Measure the average particle diameter: Determine the average diameter of the fertiliser granules in millimeters.

  2. Multiply by 100: Multiply the average particle diameter by 100.

Examples of SGN and their uses:

  • SGN 0-120

    Perfect for fine turf surfaces where by rapid granule dispersal into the turf canopy is required

  • SGN 125-150:

    Often used for golf tees, fairways, and low-cut sports turf, sometimes in combination with herbicides. These granules are often homogeneous but can be blended.

  • SGN 200+:

    Typically used for landscape turf, golf rough, and other standard cut turf. These granules are always blended.

Why SGN matters:

  • Application accuracy: SGN helps determine how evenly the fertilizer will spread and distribute, impacting application accuracy.

  • Turf health: Granule size can influence how quickly nutrients are released into the soil and how they affect turf growth.

  • Application: SGN helps choose the right fertilizer for specific spreading equipment.