What is the correct formula to calculate herbicide per tank?

The correct formula for calculating herbicide per tank involves determining the amount of herbicide needed based on the acres to be treated and the label rate provided by the manufacturer. Therefore, using the acres per tank multiplied by the label rate yields the total amount of herbicide required. This approach ensures that the application aligns with the recommended dosage, facilitating effective weed control while adhering to safety and environmental guidelines.

Considering the other options, tank volume times the label rate would not provide an accurate measure because it does not take into account the specific area being treated. The tank capacity divided by the solution needed would not help in determining the amount of herbicide required per acre, as it focuses more on the solution's volume rather than the needs of the application rate. Lastly, focusing solely on the active ingredient multiplied by the solution volume doesn't consider the application area or the recommended rates, which are crucial for effective weed management. Thus, the first option is the most suitable method for achieving accurate herbicide dosage per tank.