Oregon Pesticide Practice Test

After filling a tank one-fifth to one-half full with carrier, what is the usual order for tank mixing the remaining products?

1. Add surfactants (if needed), add suspension products, add solution products, add emulsion products, add compatibility agent (if needed).

2. Add compatibility agent (if needed), add suspension products, add solution products, add surfactants (if needed), add emulsion products.

3. Add solution products, add surfactants (if needed), add suspension products, add emulsion products, add compatibility agent (if needed).

4. Add emulsion products, add suspension products, add solution products, add surfactants (if needed), add compatibility agent (if needed).

The correct answer is: Add compatibility agent (if needed), add suspension products, add solution products, add surfactants (if needed), add emulsion products.

The correct order for tank mixing after filling a tank one-fifth to one-half full with a carrier begins with the addition of compatibility agents if needed. This step helps to ensure that all subsequent products will mix well without separating or reacting negatively. Following this, adding suspension products is essential; these products often contain solid particles that need to be well-dispersed in the liquid carrier. Making sure these particles are suspended in the mix prevents them from clumping together and ensures even distribution across the application. The next step involves adding solution products. These are typically already dissolved in the carrier and will blend easily with the mixture. After that, if needed, surfactants can be added to improve the spreading and sticking of the mixture on the target surfaces. Surfactants decrease the surface tension of the liquid, enhancing coverage. Lastly, emulsion products are added, as these can be more sensitive to the order of mixing. Emulsions contain both water and oil phases that must be properly combined without breaking. This order not only promotes the best physical and chemical compatibility but also contributes to the efficacy of the pesticide mixture, ensuring that all components work together effectively in the field.