Background: The elements that are toxic to arbuscular mycorrhizal fungi (AMF) and soil microorganisms, the levels at which they affect them, poorly known.
 Objective: To quantify effects of: 1) aluminum added (0, 50 100 mg kg-1) 2) inoculation with AMF (two isolates without prior exposure aluminum, Acaulospora delicata Gigaspora margarita, native community of a contaminated Al, control AMF...