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| Remediation of Cd contaminated paddy soil using different kinds of biochar and mineral materials: a field trial |
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| DOI：10.16768/j.issn.1004-874X.2018.04.012 |
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| Abstract: |
| In order to study the remediation effect of different immobilization materials，three kinds of straw
biochar（ rice biochar-SD，wheat biochar-XM and corn biochar-YM） and three kinds of mineral materials（ calciummagnesium
phosphate-GM，phosphate rock powder-P，silicon fertilizer-GF） were selected and applied in the field
of cadmium contaminated paddy soil. The results showed that different immobilization materials had no significant effect
on rice yield except for high dosage GF treatment decreased rice yield. The increcse in soil pH and the decrease of soil
available Cd content in YM and GM treatments were greater than those in other treatments. The decreased in Cd content
in brown rice with high dosage GM treatment was 45.9%，respectively 58.5%（ from 0.179 mg/kg to 0.137 mg/kg）. In
three kinds of biochar treatments，treatment with high dosage SD can significantly reduce the Cd content of brown rice.
The use cost of biochar was obviously higher than that of mineral materials. Considering remediation effect and use cost
of different materials，GM is a highly recommended immobilization material，and the use of biochar as immobilization
material still need to consider some factors such as costs and remediation efficiency. |
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