Fear

Ranting Woman says "You cannot be productive when you are afraid of your own shadow."

I would say it goes even further than that. You cannot be productive when the administration creates an environment where even those good teachers that the administration likes are afraid of losing their jobs.

In an environment of fear, teachers' health suffers as they cope with stress.

A highly effective manager/principal finds ways that cost little to no money that help alleviate stress in his staff.