Influence of biochar combining with micro-fertilizer on available heavy metal content in vegetable garden soil

WANG Yahui; QIN Yuhong; MA Yanrong; SHANG Yijing; LI Huashou; CHEN Guikui

doi:10.7671/j.issn.1001-411X.2018.05.003

Journal of South China Agricultural University > 2018 > 39(5): 18-24. > DOI: 10.7671/j.issn.1001-411X.2018.05.003

WANG Yahui, QIN Yuhong, MA Yanrong, SHANG Yijing, LI Huashou, CHEN Guikui. Influence of biochar combining with micro-fertilizer on available heavy metal content in vegetable garden soil[J]. Journal of South China Agricultural University, 2018, 39(5): 18-24. DOI: 10.7671/j.issn.1001-411X.2018.05.003

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Influence of biochar combining with micro-fertilizer on available heavy metal content in vegetable garden soil

College of Natural Resources and Environment, South China Agricultural University/Key Laboratory of Tropical Agro-Environment in South China, Ministry of Agriculture/Guangdong Provincial Engineering Technology Research Center of Modern Eco-Agriculture and Circular Agriculture, Guangzhou 510642, China

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Received Date: January 08, 2018
Available Online: May 17, 2023

Graphical Abstract

Abstract

Abstract

Objective
To examine the effect of biochar combining with micro-fertilizer on soil available heavy metal content.

Method
Indoor simulation experiment was conducted. Pennisetum hydridum biochar, coffee grounds biochar, peanut shell biochar and micro-fertilizer (iron fertilizer, manganese fertilizer and silicon fertilizer) were added to the vegetable garden soils polluted by heavy metals, and the contents of available Cu, Pb, Zn, Cd and Ni were determined on the 14th and 28th days.

Result
The available heavy metal contents in soils added with biochar or micro-fertilizer were lower than that of the control group. In single passivator treatments, P. hydridum biochar and silicon fertilizer had better heavy metal immobilization effects. In the blended passivator treatments, P. hydridum biochar combining with iron fertilizer had better Cu, Pb and Cd immobilization effects, the contents of available Cu, Pb, and Cd decreased by 32.94%, 31.26% and 21.21% respectively on the 14th day. The content of available Zn decreased by 6.82%, and the immobilization effect on Ni was not obvious. When coffee grounds biochar was added with iron fertilizer, the contents of available Ni and Zn decreased by 22.64% and 10.35% respectively on the 14th day. The immobilization effects were remarkable. On the 28th day, peanut shell biochar combining with iron fertilizer showed the best immobilization effect on Cu, the content of available Cu decreased by 49.06%. Coffee grounds biochar combining with silicon fertilizer had the best immobilization effect on Ni and Zn, the contents of available Ni and Zn decreased by 23.73% and 9.72% respectively.

Conclusion
The reduction effects of biochar combining with micro-fertilizer on available heavy metal content in soil are better than that of single biochar or micro-fertilizer. P. hydridum biochar combining with iron fertilizer can be used to immobilize combined heavy metal pollution of Cu, Pb, Zn and Cd in soil.
- biochar,
- micro-fertilizer,
- vegetable soil,
- available heavy metal,
- deactivation

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References (32)

References

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