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| Effects of repair fertilizer and milk vetch（Astragalus sinicus L.）on cadmium uptake and accumulation in rice |
| Received:June 28, 2022 |
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| KeyWord:milk vetch;repair fertilizer;Cd;paddy;soil enzyme;economic performance |
| Author Name | Affiliation | E-mail | | TAO Ronghao | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YUAN Xufeng | Qingyang Agricultural Technology Extension Center, Qingyang 242800, China | | | WU Xinde | Chizhou Agricultural Technology Extension Center, Chizhou 247100, China | | | WANG Yao | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LU Hongjuan | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YE Wenling | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | CHEN Yong | CNSIG Anhui Hongsifang Fertilizer Co., Ltd., Hefei 231602, China | | | MA Youhua | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | yhma2020@qq.com |
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| Abstract: |
| In this study, we explored the remediation effect of repair fertilizer and milk vetch(Astragalus sinicus L.)on cadmiumcontaminated rice fields. Under field conditions, the repair fertilizer and milk vetch treatments were set up, and the safety utilization effect was compared with lime, which is a widely used remedial treatment. The effects of cadmium on the uptake and transport of cadmium, DTPA-cadmium, chemical forms, and enzyme activities of cadmium in different parts of rice plants in cadmium-polluted paddy fields were studied. The results showed that:the combined application of repair fertilizer and milk vetch could increase rice yields by 9.01% compared to treatments without soil conditioner. The individual application of repair fertilizer or milk vetch also increased yield to a certain degree. Repair fertilizer and milk vetch applied alone or in combination could effectively reduce the content of cadmium in brown rice. The combined application of cadmium in brown rice had the best effect, reaching 28.64%. The cadmium content of brown rice treated with lime was also lower than the limit value of GB 2762-2017. The pH of the rhizosphere and non-rhizosphere rice soils increased by 0.20 and 0.32 units, respectively, with the combined application of repair fertilizer and milk vetch, which was better than that of lime treatment (increased by 0.08 and 0.23 units). The DTPA-cadmium content in rhizosphere and non-rhizosphere soils decreased by 32.25% and 40.54%, respectively, when the repair fertilizer was applied alone or in combination with milk vetch, and the cadmium reduction effect was close to that of lime treatment(27.87% and 42.85%, respectively). The combined application of repair fertilizer and milk vetch reduced the content of weak acid-extracted and reducible cadmium in soil, and increased the content of residual cadmium. In addition, the combined and separate application of repair fertilizer and milk vetch increased the activities of soil invertase, urease, protease, and catalase to a certain extent. The input-output of milk vetch and repair fertilizer applied alone or combined were 1.76, 1.73 and 1.72, respectively. To summarize, when returning milk vetch from cadmium-contaminated rice fields, the application of repair fertilizer can reduce the cadmium content of rice, increase rice yield, and improve soil enzyme activity. Its input and output are relatively high, and it has higher economic benefits and operability. |
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