The subject of the analysis was the influence of working parameters (working pressure and working speed) on +drop tracks size and changes in flow rate level from flat fan nozzle. New nozzles and nozzles after laboratory wear were tested. The influence of nozzles wear on +drop tracks size was examined. It was found that increase in liquid flow rate results in higher values of mean diameter of +drop track. Increase in working pressure or working speed cause decrease in +drop tracks size and reduce merging of drops on spray surface. Increase in wear degree was followed by increased coverage rate. This phenomenon is especially dangerous when using nozzles with considerable wear degree for agricultural spray since this poses ecological threat to environment.
