Do you have some ideas about the adsorption/ accumulation of heavy metals contained in P fertilizers by plant or by Biochar as an effective solutions to reduce soil contamination
I am not sure if I got the question right. it depends on the type of fertilizer used as a source of P. In the past rock phosphate were used as agricultural fertilizer for P. Some trace heavy metals are often expected from such sources of P fertilizer most of which become bioavailable for plant uptake. May be the following paper might help (title: Phosphatic fertilizers as a source of heavy metals in protected cultivation.)