Which of the following equipment can compact soil to effectively seal in soil fumigants?

The bed shaper and roller are specifically designed to effectively modify the soil structure, aiding in the compaction process. When soil is compacted properly, it creates a denser layer that helps retain soil fumigants in the targeted area, thereby enhancing their efficacy. This equipment is particularly effective in preparing the soil before fumigation, ensuring that the gas or chemical remains concentrated long enough to achieve the desired pest control results.

While hand tools, shovels, and rakes may assist in general soil preparation, they do not provide the same level of compaction that specialized equipment like bed shapers and rollers can achieve. Similarly, drills and augers are primarily used for different purposes, such as creating holes in the soil, and are not suited for compacting soil. Thus, the use of a bed shaper and roller is essential in the process of sealing in fumigants effectively, making it the best choice in this context.