Why does the director believe that the fertilizing room is the appropriate place to announce bernards transfer to iceland?

The director chooses the fertilizing room for the announcement about Bernards transfer to Iceland because he is going to use Bernard as a public example. These are the high caste workers and this is where they work, they are the smartest and the ones that would be most likely to have rebellious thoughts, this moment will be a lesson for them to keep them in line.