The present study was conducted to evaluate the bioaccumulation of metallic elements in forages (case Bersim) irrigated by water of Sebou and Beht River. Seven metallic elements (Cd, Co, Cr, Cu, Ni, Pb and Zn) were analyzed by Inductively Coupled Plasma (ICP). The results showed that the levels of Cd in irrigation water exceeded levels established by Moroccan standards, the concentrations of Cd and Cr in soil (0-15 cm) beyond the limits recommended by the AFNOR and contents of Cd, Cu and Ni in the edible portion of Bersim are higher than those fixed by the FAO / WHO (2001) and WHO / EU (1983). The transfer factors of Zn and Cu is high compared to other metallic elements (Co, Cd, Ni, Pb and Cr). Indeed, the high absorption of trace-elements by the Bersim tissue may be associated with the chemical form of the metal in the soil matrix, the physicochemical characteristics of the soil and to the nature of the plant species. Bioaccumulation of metallic elements identified in green fodder is caused by the use of the surfaces waters of Sebou and Beht as a source of irrigation.
This work has determined the distribution of metallic levels (Arsenic, Cadmium, Cobalt, lead, Nickel, Copper, Zinc and Chromium) in the agricultural soils (North West of Morocco) at two depths (0-15 cm and 15-30 cm). The average contents of Chromium and Cadmium in agricultural soils exceeded the limits imposed by the French standard AFNOR and the degree of pollution caused by waters of OUED SEBOU is more important than that of the OUED BEHT. The transfer of heavy metal in two depths of soil: 15-30 cm depended of clayey particle.
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