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| Effect of biodegradable organic materials and application regimes on cadmium absorption in Sorghum bicolor L. |
| Received:August 29, 2018 |
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| KeyWord:biodegradable organic materials;application regimes;sorghum;Cd;phytoremediation |
| Author Name | Affiliation | E-mail | | DUAN Ming-meng | 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 | | | WANG Shuai | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 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 | | 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 | | | LI Bai-zhong | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China | | | LONG Shi-fang | College of Agriculture, Yangtze University, Jingzhou 434025, China | | | ZHU Qi-hong | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China | |
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| Abstract: |
| A pot experiment was conducted to investigate the effects of enhancement of biodegradable organic materials and their application regimes on the uptake of Cd by sorghum (Sorghum bicolor L.). Oxalic acid (OA), citric acid (CA), and dissolved organic fertilizer (DOF) were splitting applied at rates of 2 mmol·kg-1, 2 mmol·kg-1, and 1 g·kg-1, respectively. The changes in available Cd in the soil and the growth and Cd accumulation in the shoots of the sorghum were determined. The results showed that four separate applications of CA and OA and a single application of DOF significantly increased the DTPA-Cd (DTPA extractable Cd) by 11%, 30%, and 29%, respectively, compared with that of the control (CK). Single applications of OA, CA, and DOF had no significant effect on the shoot biomass of sorghum, but two separate applications of these organic materials inhibited the growth of sorghum. Compared to CK, two separate applications of DOF significantly decreased the shoot biomass of sorghum by 38%, while the split applications of OA, CA, and DOF two or three times promoted Cd uptake by sorghum. Moreover, the Cd concentration in the roots and shoots of sorghum and the bioaccumulation factor were significantly higher than those of CK. Three separate applications of OA and CA and a single application of DOF significantly increased the Cd bioaccumulation in sorghum shoots by 17%, 30%, and 31%, respectively, compared with that of CK. Altogether, three separate applications of CA could be recommended for mobilization of Cd in soil when planting sorghum in Cd-contaminated soil. |
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