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| Effects of attapulgite application on soil nutrients in Cd-contaminated farmland |
| Received:July 14, 2019 |
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| KeyWord:Cd;attapulgite;chemical passivation repair;effective Cd;farmland |
| Author Name | Affiliation | E-mail | | ZHAO Ting-wei | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | LI Hong-da | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHOU Wei | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | DAI Yun-chao | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | Lü Jia-long | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | ljlll@nwsuaf.edu.cn |
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| Abstract: |
| To investigate the effects of attapulgite clay minerals on cadmium-contaminated farmland soils and the impedance control of Cd uptake by plants, this study treated attapulgite as a chemical repair agent and applied it to Cd-contaminated soils. The effects of attapulgite application rates on the remediation of Cd-contaminated soil and amount of Cd uptake by plants were evaluated. The results showed that only attapulgite application rates greater than 1.25 kg·m-2 reduce nitrogen and phosphorus available in the soil by 6.76 mg·kg-1 and 7.34 mg·kg-1, respectively. In addition, the application of attapulgite significantly increases soil pH and CEC content. For instance, attapulgite of 1.25 kg·m-2 reduces the effective Cd content in soil by 27.66%, while increasing soil pH by 0.51 and CEC by 6.29 cmol·kg-1,respectively.The results also showed that Cd content could be reduced by 35.19% in rapeseed and 37.29% wheat grains at the same attapulgite application rate.However, excessive application of attapulgite can lead to a decline in soil fertility; as such, appropriate application rates of attapulgite and intervals between two applications should be used to repair the Cd-contaminated farmland to control pollution while maintaining soil fertility. |
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