Aided phytostabilization of a barren, alkaline metal(loid)-contaminated technosol developed on steel mill wastes, with high soluble Cr and Mo concentrations, was assessed in a pot experiment using (1) Ni/Cd-tolerant ...
Lire la suite >
Aided phytostabilization of a barren, alkaline metal(loid)-contaminated technosol developed on steel mill wastes, with high soluble Cr and Mo concentrations, was assessed in a pot experiment using (1) Ni/Cd-tolerant populations of <i>Festuca pratensis Huds. </i>, <i>Holcus lanatus L.</i> </i>, and <i>Plantago lanceolata L. </i> sowed in mixed stand and (2) six soil treatments: untreated soil (UNT), <i>ramial chipped wood</i> (RCW, 500 m<sup>3</sup>ha<sup>−1</sup>), composted sewage sludge (CSS, 120 t DW ha<sup>−1</sup>), UNT soil amended with compost (5% w/w) and either vermiculite (5%, VOM) or iron grit (1%, OMZ), and an uncontaminated soil (CTRL). In the CSS soil, pH and soluble Cr decreased whereas soluble Cu, K, Fe, Mn, Mg, Ni and P increased. The RCW treatment enhanced soluble Fe, Mn, and Mg concentrations. After 15 weeks, shoot DW yield and shoot Cd, Cu, Fe, Mn, Mo, Zn, and Mg removals peaked for <i>F. pratensis</i> grown on the CSS soil, with lowest shoot Cr, Ni and Mo concentrations. <i>Holcus lanatus</i> only grew on the CTRL, UNT, and CSS soils and <i>P. lanceolata</i> on the CTRL soil. Best treatment, <i>F. pratensis</i> grown on the CSS soil, led to a dense grass cover but its shoot Mo concentration exceeded the maximum permitted concentration in forage.
< Réduire
