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Published in J Environ Qual 23:705-711 (1994)
© 1994 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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The Effects of Zinc Fertilization on Cadmium Concentration in Wheat Grain

D. P. Oliver*,, R. Hannam, K. G. Tiller, N. S. Wilhelm, R. H. Merry and G. D. Cozens

CSIRO Div. of Soils and Cooperative Res. Centre, Soil and Land Management, PMB 2, Glen Osmond, South Australia 5064;
Cooperative Res. Centre, Soil and Land Management, PMB 2, Glen Osmond, South Australia 5064;
S.A. Dep. of Primary Industry, P.O. Box 1783, Port Lincoln, South Australia 5606.

* Corresponding author.

ABSTRACT

Although the effect of Zn in soil on Cd uptake by plants has been studied extensively, there appears to be no consensus in the literature about the interactions. Furthermore, the majority of investigations have studied soils containing elevated concentrations of Cd or Zn as a result of pollution, e.g., the application of sewage sludge to the soil. The accumulation of Cd by wheat (Triticum aestivum L.) grain grown at nine sites across South Australia was investigated. Applications of low rates of Zn fertilizer (up to 5.0 kg Zn ha–1) were found to markedly decrease the Cd concentration in wheat grain grown in areas of marginal to severe Zn deficiency. No further significant decreases in Cd concentration in grain occurred at higher rates of applied Zn. Effectiveness of applied Zn on grain Cd concentration decreased with tune since application. Grain Cd concentrations decreased with fresh and residual applications of Zn fertilizer (up to 5.0 kg Zn ha–1). Soil tests may provide useful guides to situations where Cd concentrations in grain may be beneficially decreased by Zn applications.

Received for publication April 21, 1993.


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