Effect of Amorphous Silicon Dioxide on Cadmium Behavior in the Soil–Rice Plant System


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The effect of amorphous silicon dioxide (SiO2) on cadmium behavior in the soil–plant system was studied in a field experiment on a flooded paddy soil slightly contaminated by cadmium. The application of amorphous SiO2 results in a 1.3- to 1.8-fold smaller cadmium accumulation in the aboveground organs of rice and a 1.8- to 2.6-fold decrease in the content of its available compounds, which can be explained by metal sorption on the surface of applied silicon dioxide and by the reaction of monosilicic acid, which forms in the SiO2 solution, with cadmium. The decrease in cadmium availability is most intensive in the first 2 weeks after SiO2 application. Amorphous silicon causes a 26.6% increase in rice productivity in the first season and 72.9% in the second. The data obtained testify to the fact that the application rates of traditional mineral fertilizers can be decreased without risk to rice productivity if silicon compounds are used. They should become an integral and important part of implementing the 4R-STRATEGY for fertilizer application and plant nutrition optimization.

Sobre autores

Pengbo Zhang

Institute of Economic Geography of Hunan Province

Email: vvmatichenkov@rambler.ru
República Popular da China, Hunan

Yuqiao Liu

Institute of Economic Geography of Hunan Province

Email: vvmatichenkov@rambler.ru
República Popular da China, Hunan

E. Bocharnikova

Institute of Physicochemical and Biological Problems of Soil Science

Email: vvmatichenkov@rambler.ru
Rússia, Pushchino

V. Matichenkov

Institute of Fundamental Problems of Biology

Autor responsável pela correspondência
Email: vvmatichenkov@rambler.ru
Rússia, Pushchino

D. Khomiakov

Department of Soil Science

Email: vvmatichenkov@rambler.ru
Rússia, Moscow

E. Pakhnenko

Department of Soil Science

Email: vvmatichenkov@rambler.ru
Rússia, Moscow

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