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Crops to Benefit from BFS Cereals

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Technical Information

An HGCA funded project investigating the minimum size of target, below which air inclusion nozzles may give inadequate biological control, when applying foliar acting herbicides to small weeds, such as black-grass has resulted in an important milestone in the understanding of air inclusion nozzles. Previously it had been considered that the larger the droplet size produced by air inclusion nozzles gave increased areas between droplet depositions thereby reducing the efficacy of foliar applied pesticides.

The results of a trial conducted over 2000/2001 seasons suggest that "comparable control of black grass" may be obtained with the BFS 02 Air Bubble Jet when compared to a conventional flat fan nozzle.

Figure 1 below, shows the percentage control of black-grass panicles that was achieved with Hawk plus oil at full and half recommended doses when applied at the 1 and 2-3 leaf stages of the black-grass.

Treatment and Timing

In all cases the Air Bubble Jet 02 (Nozzle A) produced similar levels of control to the conventional flat fan (nozzle D) whilst the competing air-induction nozzles (B & C) achieved lower levels of control. This was particularly apparent at the lower doses of Hawk and/or when the target was small (i.e. 1 leaf).

The Air Bubble Jet performed better than competing air induction nozzles and in some cases this was significant. Even at the smallest (1 leaf) growth stage of black-grass, acceptable levels of control were achieved which were comparable to the conventional flat fan nozzle, although control by all nozzles tends to be better at the later timing when black-grass has 2-3 leaves.

All applications were undertaken with nozzles giving a nominal flow rate of 0.8 litres per minute at a pressure of 3.0 bars.

Not all jets are created equal. Photographic spray pattern/deposition comparison of three Nozzles using water plus 0.1% of non-ionic surfactant.

Different Nozzles and Jets

 

Nozzle Selection Chart

Click here to view the Nozzle Selection Chart

 

 

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17/07/2017
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