Uptake of zinc, cadmium, mercury, lead, chromium and nickel by ryegrass grown in a sandy soil

application rates cadmio cadmium chrome chromium cinc contenido de materia seca cromo crop yield dose d'application dry matter content efectos residuales fitotoxicidad greenhouses invernaderos lead lolium mercure mercurio mercury nickel oligoelementos phytotoxicity plomb plomo rendement des cultures rendimiento de cultivos residual effects sandy soils serre sol sableux suelo arenoso trace elements zinc