However, very coarse droplets may not provide sufficient coverage of the target area particularly if the spray must penetrate a canopy of leaves to come in contact with small weeds. The supplier should be told that you are using the tips for herbicide application and should be able to advise you on the type of tip to use. The herbicide label must be consulted about the volumes which should be used. There is a tendency to use lower spray volumes to reduce the time required to fill the sprayer. If you reduce the volume below the recommended rate, you may have increased problems with plugging of the tips or unsatisfactory weed control.
Paraquat requires thorough coverage and therefore a higher volume for best results.
Reduced volumes can reduce the chances of contacting small weeds in the bottom of the vegetation canopy. Crop residues on the soil surface may require the use of the top rate in the recommended volume range. Make sure this treatment is within the range of the herbicide label recommendations. Also remember that the denser the fertilizer solution the more slowly it flows through the tip. In this case, a tip with a larger orifice will have to be used if normal forward speed is to be maintained.