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| Research on a safe production method for soybeans on cadmium-contaminated farmland |
| Received:February 11, 2022 |
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| KeyWord:soybean;Cd pollution;low-Cd cultivars;soil amendment;safe production |
| Author Name | Affiliation | E-mail | | WANG Tianyu | Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China | | | CHEN Jian | Wenling Crop Protection and Tillage Fertilizer and Energy Sources Station, Wenling 317500, China | | | SHI Jiachun | Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China | jcshi@zju.edu.cn | | FU Xujun | Institute of Crop and Nuclear Technology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310000, China | | | XU Jianming | Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China | | | HE Yan | Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China | |
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| Abstract: |
| To discover a safe and feasible planting method for soybeans on cadmium(Cd)-contaminated farmland in southern China, low-Cd soybean cultivars were screened. Combined with the application of soil amendment, a field experiment was conducted in a strictly monitored Cd-contaminated upland field to test the accumulation of Cd in soybean tissues, as well as the yield. Field experiments were carried out in a section of the Cd-contaminated area that was deemed safe[total soil Cd content(0.49±0.04)mg·kg-1, pH 6.31] in order to screen low Cd accumulation cultivars. The results show that the Cd content of the soybean grains did not exceed the national limit and that the varieties Zhenong6, Zhexian9, Zhexian12, and Zhexian19 exhibited low levels of Cd accumulation. These four cultivars were then planted in a strictly monitored Cd-contaminated upland field[total soil Cd content(1.69±0.25)mg·kg-1, pH 4.65] to test the effect of soil amendment on soybean Cd accumulation. The application of 1 500 kg·hm-2 soil amendment led to decreased soybean grain Cd content by 30.4%~79.0%; that of Zhexian9 and Zhexian12 dropped to 0.13 mg·kg-1, reaching the national food safety limit(0.2 mg·kg-1). There was no significant difference in the Cd accumulation of soybean grains between treatments with 3 000 kg · hm-2 or 1 500 kg · hm-2 soil amendment. The yields of Zhenong6, Zhexian9, and Zhexian12 increased by 14.7%, 16.7%, and 16.1% respectively with 1 500 kg·hm-2 application of soil amendment. Therefore, applying 1 500 kg · hm-2 soil amendment and planting Zhexian9 and Zhexian12 can meet the conditions of safe soybean planting in a strictly monitored Cd-contaminated upland field. |
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