HARDI TWIN - Test results proves: Worlds best application system

Reduce up to 80% drift while saving up to 30% plant protection product – with more even coverage

New test proves HARDI TWIN is world’s best application system
A new test by Aarhus University in Denmark, using a HARDI COMMANDER TWIN FORCE sprayer, shows again the great advantages of active air spraying. Minimizing the environmental impact of spraying by lowering the consumption of plant protection product up to 30% – and reducing drift by an astonishing 80% at the same time – the TWIN boom will give you the best return on investment for your bank and climate accounts.

Very challenging conditions
The trial at the Flakkebjerg Test Center was made on bare ground and stubble to make the conditions as difficult as possible with a medium spray quality. Petri dishes mounted on small platforms were used as collectors to measure the sediments – and with a total of 15 runs per day with 45 petri dishes per run, a lot of data was collected. The tests were made under a range of conditions, including high wind speeds of up to 6 m/s and driving speeds up to 16 km/h.

To compare the test as closely as possible to the German JKI tests, we used an ISOLD 025 nozzle from HARDI with a 3 bar pressure. This delivered a medium sized spray droplet, very similar to that of the JKI reference nozzle. As the tests started, it was quickly discovered that the basic drift curve would be approximately 75% higher for the conventional boom driving at 8 km/h.

The goal is always to keep the drift at a minimum, and for these tests, the drift should be less than 0.01% at 20 m distance from the end of the boom.

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The results
The final results from the Flakkebjerg report speaks for itself. Using HARDI TWIN air
assisted booms, you will get a more even deposit compared to conventional booms, while reducing your use of plant protection products by up to 30% – seen as the variation between the minimum deposit for the conventional boom compared to HARDI TWIN. This is for open crop or bare soil; in dense crop the result would be even higher.

Using the same nozzle, the same driving speed, and the under the same wind conditions, the HARDI TWIN system will reduce your drift by up to 80% compared to a conventional boom – and with even higher wind or driving speeds, you would see an even further reduction in comparable drift. For countries like France and Netherlands, the HARDI TWIN system will always be in a higher drift reduction class. This is backed up by this test, showing that HARDI TWIN is always a class better.

So many reasons for buying HARDI TWIN booms
The TWIN air-assisted system was first developed for mist blowers back in the 1970s and 80s but quickly gained success with field sprayers. To compensate for wind conditions, the system allows the driver to angle the spray swath and adjust the air speed. It means the driver is able to reduce drift and achieve a much better penetration in dense crops – while  at the same time being able to lower water consumption by hitting the target with a minimum of waste. This results in a lowering of the chemical usage by up to 30%. In combination with higher practical driving speeds and less filling, the total spraying capacity will increase by up to 100%.

  • Up to 100% more spray capacity
  • Optimal field timing
  • Better penetration in the crop
  • Lower water consumption
  • Faster spraying speeds
  • More than 30 years’ experience in TWIN
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Aarhus University – Science and Technology, Department AgroEcology Flakkebjerg, Author: Peter Kryger Jensen

  • Spray deposition and spray drift from applications at two wind speeds were tested at 8 and 12 km/h with conventional technique and at 8, 12 and 16 km/h with Twin air assistance.
  • A 24 m trailed HARDI TWIN sprayer equipped with LD-025 nozzles at 3 bar pressure was used in the test.
  • Deposit values under the boom were generally larger at the lee side compared to the wind side. The differences were most pronounced in the test at high wind speed, where the differences in deposition between wind side and lee side was especially large for the two conventional techniques.
  • The most even distribution was found with TWIN at 8 and 12 km/h. Conventional technique at 8 km/h and 12 km/h gave the highest spray drift. The two TWIN applications at 12 and 16 km/h obtained significantly lower spray drift than the two conventional applications, but higher drift values than TWIN at 8 km/h. The spray drift measurements in the test showed a significantly lower drift from TWIN at 8 km/h compared to the other four techniques at both wind speeds.


  • Where: Aarhus University –
    Flakkebjerg Research Center
    4500 l – 24 m TWIN FORCE
  • Trial done on: Stubble and short grass
  • Nozzle: ISO LD 025 – Spray pressure 3 bar
  • Working speed – volume rate:
    8 km/h Conv & TWIN – 150 l/ha
    12 km/h Conv & TWIN – 100 l/ha
    16 km/h TWIN – 75 l/ha
  • Sedimentation drift following
    the German JKI protocol
  • Low/normal wind speed: 3-4 m/s
  • Higher wind speed: 6-8 m/s