Spreader calibration

When the spreader is set up, you are ready to spread. Read our fertiliser application advice here >

Get your settings right

You want to make sure that all of your fertiliser is going exactly where it's needed. This is how to do it.

First, keep in mind that the correct setting of your spreading machine is determined by the physical properties of the fertiliser: particle size distribution, bulk density and flow rate all influence the fertiliser spreader calibration settings.

Different kinds of fertiliser – or even the same fertiliser from different production plants – may require different settings. Always check the information on the bag of fertiliser and remember to change the settings every time you switch to a different kind of fertiliser.

You find the correct settings on the spreader manufacturer's tables. These are based on tests under ideal conditions in test stations and give information on how to set the spreader for optimum even spreading at the desired application rate (kg/ha) and at a specific working width.

Set the spreader at the right height above the crop when you are out in the field. This measurement is also found in the spreader manufacturer's tables (links lower down this page).

Next, adjust the angle at which the fertiliser hits the disk, as this determines how far the fertiliser will be thrown.

The last adjustment you must make before you check if the spreader is working properly, is the flow rate controller, as this impacts how much fertiliser is applied per acre. Again, refer to the instructions given by the spreader manufacturer and you will be good to go.
To make sure you’re achieving the best possible spreading result, you can perform a tray test using your particular combination of spreader settings and fertiliser.

The simple tray test will help you fine tune the settings, so you can rest assured that the fertiliser is spread evenly across the entire spreading width. A separate test should be conducted for different fertilisers. You can either do this yourself or hire a fertiliser spreader calibration  expert to conduct the tests.

When the spreader is set up, you are ready to spread. Read our fertiliser application advice here >