How do you calculate the application rate in pounds required for a given area?

The application rate in pounds can be calculated using the formula that relates the concentration desired (in parts per million, or ppm), the area being treated (in acre-feet), and the total weight in pounds. The correct choice states: Pounds required = 2.7 lb x ppm desired x acre-ft.

This formula is based on the concept that 2.7 pounds of a substance will yield a concentration of 1 ppm in an acre-foot of water. Therefore, if you want to achieve a specific concentration (ppm desired), you would multiply this base amount (2.7 pounds) by the desired concentration and the volume of water you're treating (in acre-feet). As a result, this calculation provides the total pounds needed to reach the desired concentration throughout the specified area.

Understanding this formula is crucial in aquatic pesticide application as it ensures that the correct amount of pesticide is used to achieve the desired efficacy while minimizing potential negative effects on the environment. This careful calculation helps in adhering to safety regulations and effective pest management practices.