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

The bed shaper and roller are specifically designed to prepare the soil for planting by forming beds and compacting the soil, which is crucial for effective sealing in fumigants. Proper soil compaction helps create a barrier that limits the escape of fumigants into the atmosphere, enhancing their effectiveness in treating pests or pathogens within the soil.

In contrast, hand tools generally do not provide the level of compaction needed for sealing. Shovels and rakes are primarily used for moving soil and debris rather than compacting it. Drills and augers are used for creating holes in the soil, which would counteract the purpose of sealing it against fumigant escape. Therefore, the bed shaper and roller are the most appropriate tools for achieving the necessary soil conditions to retain fumigants effectively.