Table 1. Pb levels of the metalliferous mine soils in the plant cultivation.

Fractions	Soil 1	Soil 2	Soil 3	Soil 4
Total Pb (mg/Kg)	6972.8±59.4	18626.2±125.1	7531.1±86.2	1577.2±36.7
10 mM CaCl2 extractable Pb (mg/Kg)	5.8±0.1	2.8±0.2	1.2±0.1	1.5±0.3
50 mM EDTA extractable Pb (mg/Kg)	6665.9±195.4	18315.8±268.1	7166.8±822.3	1445.6±72.2

Pb-polluted soils were collected in different zones from abandoned metalliferous mines of Oued El Himer, south of Oujda city in eastern Morocco. Data are the average (± SE) of three independent measurements.