Most soil science journals do not charge publishing fees.
I attach the list copied from the ISI website, ranked in order of their most recent Impact Factor. Target one, with a scope that agrees with what you intend to submit.
Thanks Prof. Lambers. your list is excellent and will help me very much to chose the best journal for publication. furthermore, more specific journals like journal of Spectroscopy which is dealing with the use of spectroscopic techniques in all areas of science, will be benefit as well.