What compells the mariners to stay back in the island in the poem.'the lotos eaters '?

The mariners are compelled to stay back in the island because of the effects of the lotos plant, which induces a state of apathy and contentment. They are lulled into a dream-like state where they lose their desire to return home and face the challenges of their journey. The mariners become enamored with the idea of remaining on the island and living a life free from hardship and responsibility.