Spray application manual
24 February 2025
Published 24 January 2025 | Last updated 20 January 2025
Consider appropriate minimum operating pressures for the nozzles chosen
When operating the selected nozzles and pressure combinations, it may become apparent that for some situations the minimum pressure is too low for some nozzles to function effectively. If this occurs, consider increasing the application volume (or travel speed) to increase the pressure at the nozzle, making adjustments to the spray plan as required.
Recognise that some tank mixes may require compromise
The mode of action of some products that may be included in a tank mix can require quite different application set-ups. For example, when tank mixing a contact product and a soil-applied product. When this occurs a decision has to be made about how you can compensate.
For example, if the droplet size selected favours soil deposition, then the volume may have to be increased to maintain efficacy with the contact product. If this is not practical, then perhaps the products should be applied as two separate applications.
Importance of checks for new operators
16 January 2025The importance of checks for new spray operators. Another video from GRDC's Spray Application GROWNOTES™ series.
Craig Day: The value of the spray plan is really critical. Having this information in the cabin can help any operator but especially if you are trying to train someone that's inexperienced at spray application. This information can be given to them and they can drive to this with all the direction they need to ensure the spray job is going to be achieved as per the plan. We've just used the speed simulation to successfully test our spray plan, everything worked out pretty good. Before calibrating the sprayer, I would use manual pressure to check the flow rate across the boom.