The present study indicated that Cd concentration inpolished
rice grain was dependent on soil types.To establish the soil
environmental quality standards for potential dietary toxicity in
polished ricegrain,both Cd bioavailability in agricultural soils and
rice grain should betaken into consideration.The selection of
proper soil types for food crop production can help us to avoid the
toxicity of Cd in our daily diet.Soil pH,cation exchange capacity
and organic matter might be the main factor swhich influence the
Cd bioavailability in different soils.Melich-3-extractable Cd and
soil pH are the leading factor swhich govern the Cd phytoavail-
ability to rice grain as demonstrated by the stepwise regression
analysis