The air dried soils of 5 kg were put into container
with diameter of 20 cm and height of 17 cm. Test soil in each pot was homogeneously sprayed with aqueous solutions containing 80 mg As, 10 mg Cd and 500 mg Pb per kg soil, which were prepared by dissolving salts of Na
3
AsO
4
·12H
2
O, CdCl
2
·2.5H
2
O and Pb(CH
3
COO)
2
·3H
2
Ointo deionized water, respectively. The fertilizers were applied to each pot with 0.27 g CO(NH
2
)
, 0.05 gKH
2
PO
4
and 0.10 g KNO
3
2
per kg soil, respectively.