Plant availability of heavy metals in soils previously amended with heavy applications of sewage sludge

abonos amendement calcique analyse de sol cadmio cadmium carotte carrots chaulage cinc cobre copper cuivre daucus carota encalado engrais enmiendas calizas espinaca fertilizers heavy metals lead lime liming liming materials lodos residuales metales pesados nickel ph ph del suelo ph du sol plomb plomo pollution sewage sludge soil chemicophysical properties soil ph soil testing spinach spinacia oleracea trigo triticum wheats zanahoria zinc