Do you know that....
- the HARDI TWIN sprayer can give you up to 50% more hours available for spraying?
In the diagram below you can see the number of hours available for spraying in the spraying season. The only differences between conventional and TWIN sprayers is that with the conventional the wind speed limit is 4 m/s where you with the TWIN can accept 8 m/s.
Spraying hours in 2000-2003 (Aarslev, Denmark).
Conditions for minimum 3 consecutive hours /day
- Temperatures day min. 1°C and min. up to 10°C, night > 1°C
- Rain < 0.1 mm/h, and < 2 mm from 3h before till 6 h after spraying.
- Relative humidity 50-95%
- Maximum wind speed: Conventional 4 m/s - TWIN 8 m/s |
Spray drift from conventional sprayer can be so great that the operator has to stop before having the spray job done. With efficient drift control it is much easier for the operator to be able to spray the entire field with optimal timing. Under most conditions the farmers get up to twice as many hours for a safe and efficient spray job with the TWIN sprayer compared to conventional spraying.
Optimal field timing
When spraying for weed, fungi and insect control, the highest effect is gained when spraying the pest at the most vulnerable stage. Field timing is the key to getting the best biological effects and is the most secure route to reduced doses.
Herbicide doses can often be reduced considerably if the target weeds are at the cotyledenous stage – a difficult challenge since only a few days are then available.
These few opportunities to spray are limited with conventional sprayers because of wind or losing time hauling large water volumes to the field. TWIN sprayers increase possibilities to spray in higher winds and gain maximum spraying time in the field too.
As a "rule of thumb" you can for the most ordinary crops roughly define following spray “windows”, i.e. the time at disposal in order to ensure a quality result with the lowest possible dosing.
Cereals: 5 - 6 days
Sugar beets: 2 days
Potatoes: 1 day
Compared with the size of the area of the various crops the above gives a good hint of the necessary capacity. In this connection another consideration is to be taken: how often do you have to spray simultaneously in various crops at the optimum spraying time.