Michigan Commercial and National Pesticide Applicator Practice Test 2025 - Free Pesticide Applicator Practice Questions and Study Guide

When mixing pesticides and other agricultural chemicals in a tank, the order of addition is crucial to ensure proper mixing, avoid incompatibility, and prevent the formation of lumps or clogs that can occur if products are added in the wrong sequence.

The correct order involves starting with the compatibility agent, which helps ensure that the other products can mix effectively without reacting negatively to each other. Following this, suspension products are added next because they are heavier and require more force to dissolve properly in the carrier. After that, solution products are introduced, as they tend to mix more readily once the heavier particles are suspended. Finally, surfactants are added; they help improve the efficacy of the spray solution by reducing the surface tension, facilitating better coverage and penetration of the target surface.

This method ensures that each type of product is given the best chance to dissolve or disperse properly, which ultimately leads to a more effective application. The other choices fail to follow this logical and scientific progression, which could lead to the issues mentioned earlier.