What should be done just before finishing filling the tank with carrier?

Just before finishing to fill the tank with carrier, it is essential to add pesticides to the mixture. Adding pesticides at this stage ensures that they are properly mixed with the carrier, allowing for an even distribution throughout the tank. This step is critical because it helps to maintain the correct concentration of the pesticide in the solution, ensuring optimal effectiveness when applied.

Adding the pesticide after most of the tank is filled helps reduce the risk of spills and allows for better mixing, as the movement caused by filling the tank will help disperse the pesticide throughout the carrier. This method also minimizes the potential for chemical reactions that could occur if certain ingredients are mixed inappropriately or in the wrong order.

Considering the other options, adding solution products, emulsified concentrates, or surfactants at that stage could lead to improper mixing or insufficient dispersion of the pesticide in the carrier, potentially decreasing the effectiveness of the application. Thus, the procedure of adding pesticides right before finishing the tank filling plays a crucial role in ensuring a successful pesticide application.