[Taera]

i cant name the source but i remember reading that Mars has some nitrogen - in frozen state however, i think on the poles. Also plants alone cannot strive outside the nitrogen cycle as i think you also require animal/bacterial life for completing the cycle and that is a whole different issue.

I also think they found not-so-thin layer of CO2 which they said would be sufficient to maintain plant life. that is, /methinks.

If realy, why bother with mars? I've never understood it. Whats special about it? is it the closest planet to earth's conditions or what.