Effects of the Combined Application of Chinese Milk Vetch ( Astragalus sinicus L.) and Red Mud to Remediate the Cadmium-Polluted Acidic Paddy Soil

Meirong Fan, Xin Liu (), Yaoyu Zhou, Avelino Núñez-Delgado, Lin Luo, Shiping Long, Huang Huang, Li Hu and Yulin Liao ()
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Meirong Fan: Changsha Environmental Protection College, Changsha 410004, China
Xin Liu: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Yaoyu Zhou: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Avelino Núñez-Delgado: Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University Santiago de Compostela, Campus Univ. S/n, 27002 Lugo, Spain
Lin Luo: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Shiping Long: Nuclear Agricultural Science and Space Breeding of Hunan Province, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Huang Huang: College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Li Hu: Hunan Sihuan Environmental Protection Technology Co., Ltd., Changsha 410142, China
Yulin Liao: Soil and Fertilizer Institute of Hunan Province, Hunan Academy of Agricultural Sciences, Changsha 410125, China

Sustainability, 2022, vol. 14, issue 20, 1-11

Abstract: In this study, we conducted field experiments to assess the effects of the combined application of Chinese milk vetch ( Astragalus sinicus L., CMV) and red mud (RM) to remediate the cadmium-polluted acidic paddy soil. The results showed that the combined application increased the yield component index and improved the grain yields, compared with the control, RM1, RM2, and CMV treatments. However, the increased range of soil pH values in the CMV-RM1 and CMV-RM2 treatments was smaller than that of the RM1 and RM2 treatments at the different rice growth stages. The soil organic matter (SOM) contents of the RM-only treatments did not differ throughout the whole period, but were significantly different ( p < 0.05) between CMV-RM2 and the control. Compared with the control, the combined application decreased the concentration of exchangeable Cd in the early rice soil. The combined application of CMV and RM substantially decreased the rice uptake of Cd. However, we found no significant difference ( p < 0.05) between the CMV-RM1 and CMV-RM2 treatments. Therefore, compared with remediation with RM or CMV alone, we recommend the combined application of CMV and RM as an economical, highly effective, and replicable amendment for remediating acidic, Cd-polluted paddy soil. Considering the restorative effect and proper use of RM, we recommend CMV-RM1 treatment.

Keywords: cadmium; contamination; red mud; Chinese milk vetch; rice; paddy soil (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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