Aluminum toxicity to tropical montane forest tree seedlings in southern Ecuador

Aims We determined the reasons why in nutrient solution increasing Al concentrations >300 μ M inhibited shoot biomass production of Cedrela odorata L., Heliocarpus americanus L., and Tabebuia chrysantha (Jacq.) G. Nicholson while 300 μ M Al stimulated root biomass production of Tabebuia chrysantha.