Effects of calcium and silicon on detoxification of aluminum (Al) of buckwheat were studied with solution culture experiments. The results showed that either calcium or silicon could alleviate toxicity of Al. The root activity

the content of soluble protein and the activity of peroxidase (POD) of buckwheat leaves were increased

and malondialdehyde content (MDA

showing lipid peroxidatic reaction) of buckwheat leaves was decreased

when addition of calcium or silicon under the stress of Al. The inhibition effect of Al toxicity on soluble protein was completely offset by either calcium or silicon in first bloom stage. However

the alleviating effects of calcium or silicon on aluminum toxicity were limited when the concentration of Al increased. The alleviating effect of calcium was better than that of silicon.