To verify the effect of phosphorus on the speciation and distribution of aluminum in the roots,two buckwheat cultivars(Jiangxi buckwheat,Al resistant cultivar;and Neimeng buckwheat,Al sensitive cultivar) differing in Al resistance were used to compare Al tolerance between cultivars.Additionally,the total Al content,monomeric Al content in roots and Al distribution in root tips were measured as indicators of the effect of phosphorus on Al.Compared to a single Al treatment,phosphorus pretreatment increased re...