Generally, nozzle type is not as critical with soil applied residual herbicides when compared to postemergence herbicides. For many years, I used a flat fan nozzle (11002DG) for all my weed control trials. Recently, I started using an AIXR11002 nozzle as my standard. I have also applied soil residuals with a TTI-02 nozzle. I have not observed any reductions in the performance of residual herbicides when using these larger droplet nozzles. Check out Figure 2 for a quick look at the coverage provided by these different nozzle types. However, I would suggest that growers refer to the nozzle manufacturer for more specific information about the potential performance of nozzles with soil residual herbicides.
|Figure 2. Spray Coverage with Various Nozzle Tips