What must be measured to calibrate granular application equipment?

To properly calibrate granular application equipment, it is essential to measure the weight of granules spread over a known area. This measurement is critical because it allows the applicator to ensure that the correct amount of pesticide is being evenly distributed over the targeted area. By weighing the granules before and after application on a specified area, the applicator can determine the application rate, which is vital for both effectiveness and compliance with safety regulations.

Accurate calibration ensures that the application meets the manufacturer’s recommendations and avoids under- or over-application, which can lead to ineffective pest control or environmental harm. Other measurements, such as the volume of liquid used or the type of granule, do not provide the necessary information to achieve the correct coverage and application rate for granular pesticides. The area treated is relevant in a general sense but does not provide the specific data required to calibrate the equipment effectively.