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| Effects of three organic materials on the availability of cadmium in soil and cadmium accumulation and translocation in rice plants |
| Received:February 24, 2020 |
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| KeyWord:organic materials;cadmium;rice;soil;iron plaque |
| Author Name | Affiliation | E-mail | | FAN Jing-jing | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | XU Chao | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | WANG Hui | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | ZHU Han-hua | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | ZHU Qi-hong | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | ZHANG Quan | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | HUANG Feng-qiu | Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China | | | HUANG Dao-you | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | dyhuang@isa.ac.cn |
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| Abstract: |
| Planting green manure, returning crop straw, and applying organic manure are the main methods for improving the soil organic matter in paddy fields. Clarification of their effects on soil Cd availability and the accumulation and translocation of Cd in rice may be useful for the safe utilization of Cd-contaminated paddy fields in south China. A plot field experiment with the application of equal amounts (2 250 kg·hm-2; dry weight)of milk vetch, rape stalk, and organic fertilizer was conducted to measure the diethylenetriamine pentaacetic acid-extractable Cd, measure the Cd concentrations in iron plaque on roots and rice tissue, study the changes in the soil physical and chemical indexes and enzyme activities, and comparatively analyze the effects and the mechanisms of these three organic materials on the transport of Cd in soil-rice systems. The concentrations of dissolved organic carbon and organic matter in the soil and the yield of rice grains increased after applying these three types of organic materials. The activities of soil catalase and cellulase were also increased by applying organic materials. The concentrations of Fe, Mn, and Cd in iron plaque on the rice roots increased with the application of milk vetch, rape stalk, and organic fertilizer. Compared with that in the control, the Cd concentrations in the rice roots increased by 4.22%, 16.99%, and 38.27%(P<0.05)with the application of milk vetch, rape stalk, and organic fertilizer, respectively. The transport coefficients of Cd from root to grain and from leaf to grain significantly increased. Furthermore, the concentrations of Cd in the rice grains significantly increased by 32.67%, 39.60%, and 54.46% with the application of milk vetch, rape stalk, and organic fertilizer, respectively. In conclusion, the application of organic materials can enhance the absorption of Cd by rice roots and the accumulation of Cd in grains; therefore, organic materials should be carefully applied to Cd-contaminated paddy soil in south China in order to prevent the risk of Cd accumulation in rice. |
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