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The toxicity of aluminum (Al) to plants in acidic soils depends on the Al species in soil solution. The effects of crop straw biochars on Al species in the soil solution, and canola growth and yield were investigated in this study. In a long-term field experiment, there were four treatments, which were a control, rice straw biochar (RS, canola straw biochar (CS, and peanut straw biochar (PS. The soil solution was collected in situ, the Al species were identified, and the relationships between the concentration of phytotoxic Al and