Empirical models of cadmium accumulation in maize, rye grass and soya bean plants

• Published in: Journal of the science of food and agriculture 2004-06, Vol.84 (8), p.845-852
• Main Authors: Tudoreanu, L, Phillips, C.J.C
• Format: Article
• Language: English
• Subjects: bioaccumulation; Biological and medical sciences; cadmium; Cereal and baking product industries; corn; Food industries; Food science; Fundamental and applied biological sciences. Psychology; Glycine max; Grasses; literature reviews; Lolium multiflorum; Lolium perenne; maize; mathematical models; meta-analysis; model validation; polluted soils; regression; regression analysis; rye grass; soil chemistry; soil pH; soil pollution; Soils; Soybeans; Zea mays
• ISSN: 0022-5142; 1097-0010
• DOI: 10.1002/jsfa.1730

Linear regression of published values for soil parameters and cadmium concentrations in plant tissues offers the opportunity to develop uptake coefficients that can be applied in a wide range of circumstances. A widespread literature search was performed which identified publications from the last 20 years containing information on cadmium uptake by maize and rye grass plants. After discarding experiments with inadequate data or parameters, 10 and eight papers were chosen for maize and rye grass respectively to develop linear models that related pH and cadmium concentration in the growth media (soil in pots or nutrient solution) to cadmium concentration in maize or rye grass plants (excluding roots). Cadmium concentrations in both maize and rye grass were positively correlated with soil cadmium concentration, and in the case of maize negatively correlated with soil pH. They were also negatively correlated with the product of soil cadmium concentration and soil pH, demonstrating that at high soil cadmium concentration a high soil pH reduced plant cadmium concentration. A further model of data generated from one experiment with soya beans demonstrated that other factors, such as soil temperature, can have a major influence on uptake.