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| Beneficial effects of lime and biochar application on farmland soil polluted by mine wastewater |
| Received:June 19, 2021 |
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| KeyWord:acidic soil;alkaline material;field experiment;maize;mine;wastewater;lime;biochar;Cadmium |
| Author Name | Affiliation | E-mail | | ZHANG Xinshuai | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHANG Hongyu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | HUANG Kai | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | SHI Cuixian | Yunnan Weixin Agricultural Technology Company, Kunming 650201, China | | | CHEN Jianjun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fangdong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zfd97@ynau.edu.cn |
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| Abstract: |
| This study examines the effects of single application and combined application of lime and biochar on the physical and chemical properties of farmland soil polluted by acid mine wastewater and crop growth. Moreover, the study provides technical support for the improvement of farmland soil polluted by acid mine wastewater. A field experiment of single and combined application of lime(0, 1 500, 4 500 kg·hm-2) and biochar(0, 15 000, 45 000 kg·hm-2) was carried out in a farmland polluted by acid mine wastewater in Yunnan Province. Two factor analysis showed that lime and biochar had significant effects on soil pH, available nutrient content, available Cd content, nutrient content, and yield, and there was significant association between them. Compared with the control, lime application alone increased acid phosphatase activity, the number of bacteria and actinomycetes and decreased urease activity and the content of alkali hydrolyzed N. Single application of biochar increased the number of fungi and actinomycetes but decreased the content of alkali hydrolyzed N and the activities of acid phosphatase and urease. The combined application of lime and biochar increased the number of microorganisms and alkali hydrolyzed N content and urease activity, but decreased acid phosphatase activity. Single and combined application of lime and biochar significantly increased soil pH and available K content, cation exchange capacity, maize biomass, nutrient content, and yield, but it significantly reduced soil available P, available Cd and Cd content of maize plants. Correlation analysis showed a highly significant negative correlation between soil pH and available Cd content. There was a significant negative correlation between maize yield and soil available Cd content. Both single and combined application of lime and biochar can improve the physical and chemical properties of farmland soil polluted by acid mine wastewater, reduce the availability of soil Cd and the content of maize Cd, and increase the yield of maize, which has an obvious effect on soil improvement. The combined application of lime and biochar is the most effective among other applications. Further, the optimal treatment effect is the observed with 4 500 kg·hm-2 lime+45 000 kg·hm-2 biochar. |
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