To properly change the application rate of your sprayer, you should:

Varying the pressure and/or changing your nozzle tip size is essential for properly adjusting the application rate of your sprayer. This method allows for precise control over the amount of pesticide being applied, ensuring that the correct dosage reaches the target area effectively.

When you increase the pressure in a sprayer, the flow rate increases, which can lead to a finer spray pattern, while a reduction in pressure results in a coarser spray. Additionally, changing the nozzle tip size can significantly impact the droplet size and distribution pattern, further influencing the application rate. Using an appropriate nozzle and managing pressure are critical for optimal efficiency and effectiveness of pesticide application, minimizing waste and environmental impact.

The other options do not provide valid methods for adjusting application rates. Non-selective herbicides are focused on control of various plants rather than application rate adjustments. Spraying when adjacent vegetation is mature can risk unintended damage to desirable plants but does not help in changing application rates. Spraying during a temperature inversion can lead to drift and ineffective pesticide placement, rather than accurate or controlled application.