Commodity Fumigation License Practice Exam

What is the effect of surface sealing during soil fumigation?

1. Increases leaching of the fumigants

2. Enhances retention of the fumigant in the soil

3. Has no significant effect

4. Decreases the volatility of the fumigant

The correct answer is: Enhances retention of the fumigant in the soil

Surface sealing during soil fumigation significantly enhances the retention of fumigants in the soil. When a seal is applied to the surface, it creates a barrier that limits the escape of fumigant gases into the atmosphere. This results in a more effective control of pests and pathogens, as the fumigant can remain in the soil longer at effective concentrations, allowing for better penetration into the targeted areas. Additionally, effective sealing minimizes the movement of air and moisture at the soil surface, reducing the potential for fumigant loss through volatilization and leaching. Consequently, the fumigant remains effective for a longer period, contributing to a more successful fumigation process. This retention is critical for ensuring that the desired treatment levels are achieved and maintained, enhancing the overall efficacy of soil fumigation practices.