Cereal herbicide applications
Autumn grass weeds
With pre-emergence sprays there is only one target – the ground. An even distribution of the spray liquid is the aim. Patchy weed control most usually comes from patchy application, due to the wrong choice of nozzle and drift.
Fine sprays are important for retention on difficult to wet grass weed leaves such as wild oats and black-grass. For a given volume of liquid, when the drop size is halved, the number of drops produced goes up by a factor of eight, and the coverage of a flat area of leaf or ground may be up to four times greater. So where the target is very small, a fine spray will greatly increase the chances of hitting it.
| Water volume | 100 l/ha and above |
|---|---|
| Nozzle choice | For pre-emergence applications use the Defy nozzle alternately forward and back along the boom. For post-emergence applications use the Hawk nozzle pointing forwards for best results. Alternatively the Defy nozzle can be used where drift might be an issue |
| Application speed | If conditions are sub-optimal slow down and apply at 12 km/h |
| Other comments |
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Spring grass weeds
| Water volume | 100-200 l/ha |
|---|---|
| Nozzle choice | Hawk nozzle or conventional flat fans. Air inclusion nozzles are less effective at this time, especially in a dense crop |
| Application speed | 12 km/h is optimum |
| Other comments |
