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Published in J Environ Qual 15:341-345 (1986)
© 1986 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Cadmium- and Zinc-treated Sludge on Yield and Cadmium-Zinc Uptake of Corn1

F. J. Sikora and Jeff Wolt2

ABSTRACT

Sludge obtained from a regional wastewater treatment plant in Tennessee was factorially treated with four levels each of Cd and Zn and applied to Statler sandy loam surface soil (Humic Hapludults) sown to corn (Zea mays L.) in a greenhouse experiment. The highest Cd and Zn additions (75.1 and 759 mg kg–1) soil, respectively, resulted in dry weight decreases of 19 and 25%, respectively, for corn tops and 47 and 56%, respectively, for corn roots. The 19% dry weight reduction at a Cd addition of 75.1 mg kg–1 soil was considerably less than values found in the literature. This comparatively modest dry weight reduction was attributed to a lower Cd availability due to Cd precipitation or binding in the sludge. Zinc effectively competed with Cd for uptake as evidenced by a decrease in Cd content of roots with increased Zn additions. On the contrary, Cd content of tops was not consistently decreased with increased Zn application. An increase in the Zn levels of sludge was also found to increase the solubility of Cd in the sludge and soil.

Key Words: Zea mays L. • Cd-Zn translocation • DTPA-extractable Cd and Zn • soil solution Cd and Zn • Cd-Zn interaction

NOTES

1 Contribution from the Dep. of Plant and Soil Science, Univ. of Tennessee, Knoxville, TN 37901-1071.

2 Former Graduate Research Assistant and Associate Professor, respectively. Senior author is currently Postdoctoral Associate, Dep. of Agronomy, Cornell Univ., Ithaca, NY 14853.

Received for publication July 9, 1984.




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