In four-year experiments the influence of droplet size and nozzle designs on the activity of a commercial herbicides triberenuron-methyl (Granstar 75 WG) and mixture of 2,4 D, dicamba, and mecoprop (Aminopielik Tercet 500 SL) applied to broadleaf weeds in spring barley was examined. The recommended and half doses were applied at 200 and 280 l ha⁻¹ and at 250-570 μm (VMD) diameter droplet sizes, using air inclusion (ID 12003), low drift (TT 11003) and conventional flat fan (11003 XR) nozzles. The results showed that smaller droplet size increased herbicide performance at constant spray volume, regardless of the droplet size range investigated. A significant interaction between the droplet size and herbicide type was observed. Generally, for triberenuron-methyl a performance was increased at smaller droplet size (250-270 μm), but significant increase of herbicide activity only at half dose was obtained. There were no significant interactions between droplet size and performance of mixture 2,4 D, dicamba, and mecoprop.
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