What is the primary purpose of sealing tarp edges during soil fumigation?

The primary purpose of sealing tarp edges during soil fumigation is to contain soil fumigants. This is crucial for several reasons, primarily related to safety and effectiveness. When the edges of the tarp are properly sealed, it minimizes the escape of the fumigant into the atmosphere, ensuring that the concentration of the chemical remains effective within the treated area. This containment is essential for achieving the desired level of pest control while also protecting the environment and surrounding areas from potential exposure to the fumigant.

Furthermore, by keeping the fumigant contained, it helps ensure that the treatment penetrates the soil adequately, which is vital for dealing with various pests and pathogens located deeper in the soil structure. Effective containment not only enhances the efficacy of the fumigation process but also reduces the risk of adverse health effects on workers and nearby populations, engaging indirectly with worker protection but not being the primary purpose.

The other options, while relevant in a broader context of safety and operational integrity during fumigation processes, do not capture the main objective of sealing the tarp edges. Enhancing odor control, protecting workers, and allowing water penetration are not primary concerns when sealing tarp edges in a fumigation setting.