What should I do if my department head encourages us to do questionable practices to raise publication indices? In our departmental staff meeting, we were encouraged by the head to practice salami slicing and to require authors of the papers we review to cite our own papers. What should I do in this case? What is likely to happen if I express my disagreement? I am a junior member of the faculty.
This is scientific misconduct. First, you are responsible for yourself. In your situation I would not follow these practices since it can (and probably will) have bad consequences for you.

However, you should address your concerns. Almost every university has a person who is responsible for scientific integrity. Sometimes he/she is called ombudsman. Have a talk with them. Try to do this in an anonymous way, otherwise I would fear the consequences.