Abstract
When acidic soil is limed, cadmium adsorption onto soil is increased, thereby reducing its availability to plants. The bioaccumulation of Cd in ryegrass and rice grown in Cd-amended red earth was investigated under upland and flooded conditions. Under both growing conditions, Cd uptake in plant shoots was shaply reduced. At all Cd levels investigated, liming restricted the transfer of Cd from roots to shoots. Under flooded conditions, Cd was decreased in exchangeable fractions and increased in complexed fraction. Subsequent liming decreased exchangeable Cd further. Under upland conditions, Cd was transferred from the exchangeable fraction to the residual fraction.