What action is necessary to keep a pesticide evenly mixed in a tank solution?

To maintain a pesticide evenly mixed in a tank solution, agitation is essential. When pesticides are mixed with water or other carriers, solid particles may settle at the bottom or separate from the solution over time due to gravity. Agitation helps to continuously stir the solution, ensuring that the pesticide remains uniformly dispersed throughout the mixture. This is crucial for achieving consistent application rates and effectiveness when the pesticide is used; an unevenly mixed solution could lead to inadequate pest control or damage to plants.

Heating, while it may aid in dissolving certain substances, is not a standard practice for keeping a pesticide mixed and could potentially alter the chemical properties of the pesticide. Cooling is generally not relevant in this context, as pesticide efficacy typically does not require temperature control during mixing. Filtration is more related to removing impurities or undissolved particles from a mixture, rather than maintaining an even distribution of the pesticide itself. Thus, agitation is the key action required to ensure the effective and safe use of pesticide solutions.