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The spraying concept from danfoil Eurofoil and the small droplets Application in practice - it´s simpel! Drift

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Application in practice - it's simple!

Boom height

The recommended boom height is 60-70 cm above the crop. Please see our spray guide on p. 23.

As illustrated by the figure below, the operator must be aware of the atomizers reach is reduced when driving into a headwind, in order to achieve the most effective spraying. Therefore, the boom height, when driving headwind, must be lower than in tailwind.

 

The proper height is determined by the operator who, with his own eyes, easily finds the appropriate height of the boom for the particular job.

If the wind is coming diagonally from the front, the side of the boom, which is upwind, must be lower than the other side of the boom. Recommended driving speed is 6-7 km/h.  When spraying in dense crops and in beet sprayings, the recommended driving speed is slightly lower.

Air pressure

Adjustment of air pressure can be read from the curve above and in our spray guide. The curve is only to be regarded as indicative; the conditions at the time of the spraying may result in different adjustments. It is important to note that the air pressure must depend on the height of the crop, development stage, and wind conditions etc.

Air pressure curve

Please be aware that the droplet spectrum from a Eurofoil atomizer depends solely on the pressure and not on the amount of fluid. This means that a liquid volume between 20-100 l/ha does not alter the droplet spectrum, provided that air pressure is the same.

The air pressure in the boom has an impact on both atomization, penetration into the crops and the risk of drift. Hence, the following general instructions are as follows:

When spraying on bare soil and in low crops (stage 1-5) it is recommended to use low air pressure (10-13 cm VS). This setting allows larger droplets and reduces the risk of wind drift. The boom height is adjusted so that the atomisation just touches the ground (Plants or small partsof the plant on the ground must be moved easily by the airflow from the sprayer)

Under conditions, where there is increased risk of wind drift, the operator must pay close attention to air pressure and boom height.

Spraying task

When spraying beets, the guidance for spraying on bare ground and in low crop must be followed- see above.

When combating weed and during the first spraying task with fungicide (levelling pole 1-5) spraying should be carried out with such low air pressure that the plants are slightly moved by the air. Avoid too high air pressure since this can press down the crop.

When the crop grow, the air pressure must be increased to ensure better deposition onto the plants (levelling pole 6-10).

Higher air pressure leads to smaller droplets and therefore guarantees a better deposition onto the plants. The final spraying task (levelling pole 10-11) must be carried out with an air pressure of approx. 22 cm water column.

The first spraying task for potatoes is carried out with low air pressure. When the amount of crops to be sprayed is increasing as in the last spraying tasks for desiccation the air pressure is raised up to a level of 25 cm.

Recommended air pressure is illustrated in the figure above. The air pressure is adjusted according to the growth of the crop and according to the wind conditions. The illustration is considered as a guideline. For different operating conditions or times for spraying you might have to change the pressure according to the new circumstances.

The level of air pressure is determining both the penetration and deposition of spray liquid onto the crops as well as the risk of drift.

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