Manganese (Mn) is toxic to plants at high concentrations with recent evidence indicating slowed tropical-tree growth by high soil Mn concentrations. However, little information exists about the physiological effects of high Mn on tropical trees. We investigated physiological responses and toxicity effects of Mn in several tropical tree species. Given potential physiological interactions between Mn and phosphorus (P), we also hypothesised that P could be used to detoxify Mn.
