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| Effects of different combined amendments on Cd uptake and accumulation by rice |
| Received:August 21, 2019 |
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| KeyWord:Cd contamination;combined amendment;rice;uptake;accumulation |
| Author Name | Affiliation | E-mail | | LI Yang | College of Land Science and Technology, China Agricultural University, Beijing 100193, China | | | YIN Ying-jie | College of Land Science and Technology, China Agricultural University, Beijing 100193, China | | | ZHU Si-hang | College of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | | | ZHANG Xin | College of Land Science and Technology, China Agricultural University, Beijing 100193, China | | | HUANG Yi-zong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Zhe | College of Land Science and Technology, China Agricultural University, Beijing 100193, China | | | SHANG Jian-ying | College of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | jyshang@cau.edu.cn |
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| Abstract: |
| A field experiment was conducted to study the effect of different combined amendments on Cd uptake and accumulation by rice plants. In this study, lime, red mud, and kaolin were mixed in different proportions(the total application amount was 4500 kg·hm-2)and the mixtures were applied to Cd-contaminated paddy soil. According to the different mixing ratios of the three materials(lime, red mud, and kaolin), five treatments were designed:CK(control treatment), T1(1:7:4), T2(3:5:4), T3(4:4:4), and T4(6:2:4). The results showed that the four combined amendment treatments could significantly reduce the available Cd content of the soil and the Cd accumulation in different parts of the rice plant. Compared with that of the CK, the available Cd contents in soil were decreased by 28.0%, 40.9%, 43.4%, and 57.4%, and the Cd contents in rice grain were decreased by 47.1%, 49.2%, 55.5%, and 81.6% for the four treatments with combined amendments, respectively. The Cd contents of rice grain in T2, T3, and T4 treatments met the National Food Safety Standard value (GB 2762-2017, Cd ≤ 0.2 mg·kg-1). The correlation analysis showed that the available Cd content of the soil were significantly related to the Cd contents in various parts of the rice plant(roots, stems, leaves, and grain), and the Pearson correlation coefficient values were 0.826, 0.709, 0.778, and 0.532, respectively. The root bioaccumulation factors of the five treatments were 5.03, 1.83, 2.22, 1.32 and 0.90, respectively; thus, amendment treatments significantly reduced the bioaccumulation capacity of rice roots for Cd. There was no significant difference in the yield of rice or the K and Mg contents of grain in each treatment, and the Ca content of grains was in the order of T1 > T2 > T3 > T4. Based on a comprehensive analysis, the T4 treatment was the best in the five treatments for reducing the available Cd content in soils and the Cd content in rice grains. Furthermore, it did not reduce rice yield or the K, Mg, and Ca contents that are closely related to rice quality. |
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