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| Effects of sodium silicate on soil properties and Cd, Pb and Zn absorption by rice plant |
| Received:March 06, 2016 |
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| KeyWord:sodium silicate;rice;cadmium;lead;zinc |
| Author Name | Affiliation | E-mail | | ZHAO Ming-liu | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | TANG Shou-yin | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | DONG Hai-xia | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LI Hong-hong | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WU Zhu-lin | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | HUANG Jun-xing | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WANG Guo | College of Resources and Environment, Key Laboratory of Soil Environment Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | 1400619353@qq.com |
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| Abstract: |
| Effects of sodium silicate(Na2SiO3) on the uptake of Cd, Pb, and Zn by rice from heavy metal contaminated soil were studied by pot experiments, using an Indica rice(Yiyou 673). Application of sodium silicate significantly increased soil pH in both tillering and mature stages. Consequently, DTPA-extractable soil Pb was decreased by 40.34%~43.26%(in tillering stage) and 10.99%~18.14%(in mature stage). DTPA-extractable soil Zn was also reduced by 43.91%~58.92%(in tillering stage) and 4.16%~28.41%(in mature stage), respectively. DTPA-extractable Cd was significantly decreased in tillering stage whereas it was increased in mature stage. After application of sodium silicate, Pb transfer factors of root-to-stem in tillering stage, stem-to-grain and leaf-to-grain in mature stage were reduced up to 67%, 70% and 80%, respectively. Zn transfer factors of root-to-stem in tillering stage, root-to-stem and leaf-to-grain in mature stage decreased up to 60%, 54.90% and 59.38%, respectively. However, the Cd transfer factors of stem-to-leaf in tillering stage, stem-to-grain and leaf-to-grain in mature stage were increased up to 54.14%, 64.29% and 90.24%, respectively. Thus, application of sodium silicate decreased the availability of soil Pb and Zn, depressed Pb transfer from root to stem in tillering stage, stem-to-grain and leaf-to-grain in mature stage. Zn transfer of root to stem in tillering stage, root-to-stem and leaf-to-grain in mature stage, thus, decreasing Pb and Zn concentrations in brown rice. On the contrary, sodium silicate raised the availability of Cd in the soil and promoted the transfer of Cd from stem to leaf in tillering stage, and from stem or leaf to grain in mature stage, increasing Cd concentration in brown rice. |
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