Summary: calibrating your knapsack sprayer for pesticide dose and spray mix/water volume

Visually check and fit your nozzle;

Practice achieving the pressure at which the sprayer needs to be maintained in order to emit the right flow rate; the right amount of spray liquid from the nozzle.

Check the flow rate of your nozzle.

Practice maintaining the nozzle height and sprayer pressure so that you achieve the right swath width and drop size.

Practice maintaining your spraying speed, the nozzle height and sprayer pressure so that you achieve the right swath width and spray distribution.

Complete the calibration by checking that the right amount of spray is being emitted over a known area in the right spray pattern.