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| Remediation of Cd-polluted paddy soils using amendments combined with agronomic measures |
| Received:May 04, 2018 |
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| KeyWord:amendments;agronomic measure;soil remediation;Cd;paddy rice |
| Author Name | Affiliation | E-mail | | CHEN Si-hui | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China | | | ZHANG Ya-ping | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China | amflora@seu.edu.cn | | LI Fei | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China | | | SHEN Kai | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China | | | YUE Xiu-peng | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China | |
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| Abstract: |
| Field experiments were conducted to investigate the effects of three amendments (fly ash, phosphate rock, and biochar) combined with foliar silicon fertilizer on the available Cd content in soil and Cd uptake by rice grain, as well as rice growth. BET surface area, scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), and energy dispersive spectrometer (EDS) were employed to characterize the textural properties of three immobilizing agents. The combination of characterization techniques showed that the biochar had loose and porous structure with larger BET surface area (146.83 m2·g-1) and higher amount of oxygen-containing functional groups, such as carboxyl group, which can reduce the available Cd content by forming a complex with Cd. In comparison with those of the control treatment, all treatments increased the pH values and reduced the available Cd content in soil. The treatment with biochar resulted in the highest reduction in available Cd content, which was 41.53%, followed by the single use of fly ash and phosphate rock with the reduction of 27.92% and 25.97%, respectively. Additional spraying of foliar silicon fertilizer did not affect the available Cd content evidently, which maybe because foliar silicon fertilizer was applied by foliar spraying and silicon precipitated with heavy metal mainly in rice. All treatments reduced the Cd content in rice grains, in which the combination of biochar and foliar silicon fertilizer had the highest efficiency with 17.59% reduction compared with that of the control. Furthermore, only biochar increased rice yield in terms of single use of amendments, whereas, biochar combined with foliar silicon fertilizer exhibited a better effect on rice growth. It is concluded that biochar combined with foliar silicon fertilizer can simultaneously reduce the available Cd content in soil and Cd content in rice grains, as well as increase rice yield, presenting a good prospect of application. |
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