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 Prosopis seeds were grown under controlled environment in solution of aluminum and chromium at different concentration alone as well as combined together. The effect of these metals was studied on seed germination، root length، shoot length، seedling length and dry biomass. Aluminum and chromium alone، and combined together showed no effects on germination and dry biomass. Chromium alone was found toxic to root، shoot and seedling length. However، application of different concentrations of aluminum increased the root، shoot and seedling growth. It may be concluded that aluminum is not as toxic as chromium، and their combined treatment showed the intermediate effect by ameliorating the impact of one another.