When applying a fumigant, why is it important to use warning agents?

Using warning agents during fumigation is crucial primarily for safety reasons. These agents are specifically designed to alert individuals in the vicinity of a fumigation site in case of a fumigant leak or unintended exposure. This is especially important because many fumigants are toxic and can pose serious health risks if inhaled. The presence of a warning agent provides an additional layer of protection, ensuring that workers and nearby residents can take the necessary precautions or evacuate the area promptly, reducing the potential for harm.

The other options, while they address various aspects of fumigation, do not focus on safety. Enhancing the efficacy of a fumigant does not pertain to the role of warning agents; instead, it relates to the effectiveness of the chemical itself. Improving soil quality and changing the pH level of the soil are also unrelated to the function of warning agents, as these outcomes are typically connected to the fumigant's chemical properties rather than any safety measures in place. Therefore, the core purpose of warning agents lies in their ability to signal hazards, ensuring that safety is prioritized during the fumigation process.