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Plant Uptake of Cadmium as Influenced by Cation Exchange Capacity, Organic Matter, Zinc, and Soil Temperature¹

ABSTRACT

The effects of several soil factors on cadmium (Cd) accumulation by plants were determined. Cadmium concentration in oat shoots (Avena sativa L.) was decresaed by increasing the cation exchange capacity (CEC) of the soil. Except for its CEC effect, organic matter did not influence the concentration of Cd in oat shoots. The results indicate that the retaining power of organic matter for Cd is predominately through its CEC property rather than chelating ability. Cadmium concentration of soybean shoots (Glycine max L.) increased with increased soil temperature. In the presence of 10 ppm of soil-applied Cd, the addition of Zn from the 5 to 50 ppm range, apart from raising the Zn concentration, significantly increased the Cd concentration of soybean shoots. The increased Cd concentration was primarily due to decreased plant growth. A depression in Cd concentration of soybean shoots, relative to control, began to occur at the 100 ppm Zn level.

Key Words: heavy metal

¹ Contribution from the Dept. of Agronomy, Ohio Agricultural Research & Development Center, Wooster. Journal Article No. 90-73.

² Professor, Ohio Agr. Res. & Dev. Center and Ohio State University, Wooster, Ohio 44691.

Received for publication September 26, 1973.