Which practice is important to prevent contamination during chemical application?

Cleaning the equipment before changing chemicals is crucial for preventing contamination. This practice ensures that any residual chemicals from a previous application do not mix with the new chemicals being used. Contamination can lead not only to reduced effectiveness of the pesticide but also to adverse environmental impacts and potential harm to non-target organisms.

Using old sprayer equipment may introduce wear and residues that could compromise the effectiveness and safety of the application. Scooping chemicals directly from the container can lead to spills, cross-contamination, or exposure to harmful chemicals. Filling the tank in an open area may be necessary for safety, but it does not directly address the risk of contamination from previous substances within the equipment. Keeping equipment clean and making sure it is free from remnants of past chemicals is a best practice in maintaining safety and efficacy in agricultural applications.