What does calibration in pesticide application involve?

Calibration in pesticide application primarily involves verifying and adjusting equipment to ensure that it accurately delivers the correct amount of pesticide to the intended area. This process is crucial for effective pest control and for minimizing environmental impact. When application equipment is calibrated properly, it enhances the efficacy of the pesticide by allowing for even distribution and the right dosage, which reduces waste and prevents harm to non-target species.

While estimating the amount of pesticide required, choosing the right pesticide for the specific crop, and testing the toxicity of pesticides are all important components of pesticide management, these steps do not directly pertain to the calibration process itself. Calibration specifically focuses on the functionality and accuracy of the application equipment, making option A the correct choice.