Fan nozzles

'Standard Flat fan' nozzles and ‘even spray flat fan’ nozzles project spray downwards onto lower growing crops, weeds and soil in a highly uniform manner. This means they are particularly suitable for field crop spraying especially when using herbicides. Some can also be used when downward spraying insecticides and fungicides (but beware of spray drift).

Even spray flat fan nozzles produce an even spray distribution and so are typically used to spray between and over crop rows. Changing the nozzle height changes the swath width. This flexibility means they can be used in crops having a range of canopy widths.

Standard Flat fan nozzles produce a triangular shaped spray pattern which tapers at the edges.

This means that the full dose is applied at the centre of the swath, with a reducing dose at the edges. When one swath is sprayed alongside another, with the nozzle at 0.5 metre intervals and at 0.5 metres height, the edge deposits overlap each other so that this overlapped area is treated at the same dose rate as the centre of the swath.

When measuring the swath it can be difficult to see where to measure from and to as the edges are not sharply defined. To measure the swath, spray for a few seconds until you can see where most spray is being applied as a wetted area. The spray volume tapers away on each side and the distribution is lighter here. Measure from this point ….… to the point where the pattern becomes lighter on the far side

 

Standard Flat fan nozzles are used at 0.5 metres intervals across a boom. When two or more nozzles are used the patterns of the nozzles overlap so that the pattern between the nozzles is uniform.