Scientia Agricultura Sinica ›› 2005, Vol. 38 ›› Issue (01): 116-121 .

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION • Previous Articles     Next Articles

Influence of Silicon on Cadmium Availability and Cadmium Uptake by Maize in Cadmium-contaminated Soil

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  1. 南京农业大学资源与环境科学学院
  • Received:2004-03-15 Revised:1900-01-01 Online:2005-01-10 Published:2005-01-10

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Abstract: Pot experiments were conducted to investigate the influence of silicon on soil cadmium fractionation and cadmium uptake by maize (Zea may L. Nongda 108). The results showed that Cd toxicity in maize treated with Cd at 0.1 or 1.0 mmol·kg-1 (added as CdSO4·8/3H2O) was significantly alleviated by addition of 2.0 g·kg-1 sodium metasilicate (NaSiO3·9H2O) due to the decreased Cd uptake by maize. The ameliorative effect of Si was due to lower exchangeable Cd and Fe/Mn oxide-bound Cd, and higher carbonate-bound and residual Cd in Si-treated Cd-contaminated soils compared with non-Si-treated ones. One of the possible mechanisms of Si-enhancement of resistance to Cd toxicity is that silicate alters the Cd forms in soil, resulting in reduction of Cd bio-availability.

Key words: Cadmium fractionation, Cadmium toxicity, Maize, Silicon

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