Authors: Zhao, Xiu-Lan; Masaihiko, Saigusa

Source: Water, Air, and Soil Pollution, Volume 183, Numbers 1-4, July 2007 , pp. 309-315(7)

Publisher: Springer

Abstract:

Porous hydrated calcium silicate (PS) is a by-product of autoclave light weight concrete and is being used as a silicon fertilizer in Japan. The impacts of this amendment on the yield and cadmium content of rice (Orzya sativa L. var. Kokoromachi), soil pH and the extractability of soil cadmium assessed by 1 M NH₄OAc were compared with those of silica gel and CaCO₃ by pot experiments. The application of PS at the rate of 2.0% and silica gel at the rate of 1.0% in Andosol and PS at the rate of 0.75% in Alluvial soil significantly increased the grain weight of rice. PS and CaCO₃ treatment significantly increased soil pH, decreased the 1 M NH₄OAc extractability of cadmium and reduced cadmium content in straw and brown rice in the two soils. However, cadmium content of rice of PS treatments was not significantly different from that of CaCO₃ treatments in Andosol, while was significantly lower than that of CaCO₃ treatments in Alluvial soil. Soil analysis showed that it was less effective in increasing soil pH and decreasing the extractability of cadmium by 1 M NH₄OAc than CaCO₃ at the same application rate in Andosol. Soil pH and 1 M NH₄OAc extractability of cadmium were not significantly different between 2.0% of PS and CaCO₃ treatments in Alluvial soil. The application of silica gel did not improve soil pH nor decrease the extractability of soil cadmium, but resulted in a significant decline of cadmium content in brown rice. These results demonstrate that the supply of silicon together with an increase in soil pH, as obtained by PS application, shows potential to reduce the cadmium content of rice.

Keywords: Paddy soil; Cadmium pollution; Porous hydrated calcium silicate; Rice

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11270-007-9379-z

Affiliations: 1: Email: zxl@swu.edu.cn

Publication date: 2007-07-01

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