TY - JOUR N2 - Nine phyto-ashes from the biomass combustion of birch (Betula), oak (Quercus), red oak (Quercus rubra), horbeam (Carpinus), pine (Pinus sylvestris), poplar (Populus), maple (Acer), oilseed rape straw (Brassica napus) and wheat straw (Triticum aestivum) were blended with a biogas digestate at 1:1 mass ratio to give nine organic-mineral soil improvers. The concept of the research was to outline an eco-friendly and low cost soil improver for remediating degraded lands. These (i.e. phyto-ashes, improvers and the biogas digestate) were applied (0, 5, 10, 20, 40 t·ha-1) to a soil metallurgically contaminated with Cu, Zn, Pb and Cd. Of several tested parameters, pH changes revealed that organic-mineral soil improvers may efficiently replace (linear R2>0.90****, P<0.001) phyto-ashes in soil remedial goals. Buffering properties expressed by the cation exchange capacity (CEC) improved progressively: 29, 52, 71, 100% (phyto-ash treatments) and: 18, 37, 44, 73% (improvers treatments) for the rates 5, 10, 20, 40 t·ha-1, respectively as referred to the control CEC. The Dynamic Remediation Efficiency (DRE) indices for Cu, Zn, Pb, Cd revealed metal-specific geochemical reactions initiated by phyto-ashes, improvers and biogas digestate. The rates 5.0–10.0 t·ha-1 for phyto-ashes and about 20 t·ha-1 for improvers [1:1, i.e. Phyto-ash:Biogas digestate] are recommended. For biogas digestate, the rates 10–20 t·ha-1 were found more efficient. L1 - http://www.czasopisma.pan.pl/Content/111661/PDF/Archives%20vol%2045%20no%202%20a4_internet_9.pdf L2 - http://www.czasopisma.pan.pl/Content/111661 PY - 2019 IS - No 2 EP - 83 DO - 10.24425/aep.2019.127982 KW - soil KW - heavy metals KW - remediation KW - phyto-ash KW - biogas digestate KW - improvers A1 - Diatta, Jean A1 - Grzebisz, Witold A1 - Bzowski, Zbigniew A1 - Spychalski, Waldemar A1 - Biber, Maria PB - Polish Academy of Sciences VL - vol. 45 DA - 29.05.2019 T1 - Ameliorative effect of phyto-ash and biogas digestate improvers on soil contaminated with heavy metals SP - 73 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/111661 T2 - Archives of Environmental Protection ER -