Effect of different amendments on trace metal bioavailability in agricultural soils and metal uptake on lettuce evaluated by Diffusive Gradients in Thin Films

In this study, we have investigated the effect of two different organic amendments on trace metal transfer from soils to crops. Agricultural were mixed with (i) biochar (BC) at levels (3% and 6%, w/w), (ii) compost one level (30%, w/w). Lettuce ( Lactuca sativa L.) was planted, end growth, metals (Cd, Cr, Cu, Ni, Pb Zn) analysed in both plants soil. To evaluate bioavailability mobility labile metals, methodologies used, such as diffusive gradients thin films (DGT) technique, BCR sequential extraction pore water extraction. It has been observed that lettuces grown added compost, amounts Cd, Cu 1.7, 2.4, 1.3 3.7 times lower, respectively, than those found planted no amendment. Moreover, addition 3% BC reduced uptake Cr (24%) whereas a 6% (55%) (50%) levels. Using DGT technique matter (OM) content, fractions successfully correlated (p < 0.05) lettuce total concentrations. conclusion, method shown similar efficiency front other methodologies, although it seems DGT-methodology is faster more cost-effective for predicting by plants. • We tested applications lettuce. Uptake 2 4 lower nonamended soils. Biochar produces greater weight leaves, roots biomass lettuces. also increases leaf length enhances significantly chlorophyll content. The effective concentration significant