In May 2015, a field trial was performed on the lab field of the Biotechnical Faculty, University of Ljubljana, Slovenia. A tractor-mounted sprayer was used to deposit fungicide Prosaro (active ingredients: protioconazole + tebuconazole) on the front and rear head sides of winter wheat. Four different nozzles were used in the trial: the AI nozzle – an asymmetric double flat fan anti-drift nozzle, the AVI nozzle – a symmetric double flat fan anti-drift nozzle, the TTJ nozzle – a symmetric double flat fan nozzle, and the TR nozzle – a standard hollow cone nozzle. The best coverage value on the front and rear head sides was reached with the AVI nozzle. In comparison with the front head side, the use of almost all the nozzles resulted in poorer coverage of the rear head side. The smallest coverage value on the rear head side was reached with the TTJ nozzle. In comparison with the AI and TTJ nozzles, the use of the TR and TTJ nozzles resulted in a significantly higher droplet impression number per cm2, especially on the front head side, while differences on the rear head side were smaller. As expected, the use of the AI and AVI anti-drift nozzles resulted in larger average droplet impression areas on the front head side than the use of the TR and TTJ nozzles. In comparison with the other nozzles, the use of the AVI nozzle resulted in a better droplet impression area on the rear head side. The results show that some of the newer nozzle types (AI) do not ensure the expected quality of the deposit on the winter wheat head.
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