| Effects of different additives on the remediation of cadmium\|contaminated soil by Amaranthus hybridus L. |
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| DOI：10.7606/j.issn.1000-7601.2025.02.13 |
| Key Words: cadmium polluted soil Amaranthus hybridus L. phytoremediation additives |
| Author Name | Affiliation | | HUANG Tiangang | School of Agriculture, Henan University of Science and Technology, Luoyang， Henan 471000, China | | CHANG Huiqing | School of Agriculture, Henan University of Science and Technology, Luoyang， Henan 471000, China | | ZHOU Rui | School of Agriculture, Henan University of Science and Technology, Luoyang， Henan 471000, China | | WANG Qizhen | School of Agriculture, Henan University of Science and Technology, Luoyang， Henan 471000, China |
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| Abstract: |
| A pot experiment was conducted to investigate the phytoremediation effects of Amaranthus hybridus L. on Cd\|contaminated calcareous wheat fields in a specific region of Henan Province. Three different amendments—pig manure, rice straw, and calcium carbonate — were applied to assess their impact on the phytoremediation efficiency of Amaranthus hybridus L. in Cd\|contaminated soil. Ten treatments were used: basal fertilizer (N，P，K) (CK)，basal fertilizer + 0.5% pig manure (RS0.5), basal fertilizer + 1% pig manure (RS1), basal fertilizer + 3% pig manure (RS3), basal fertilizer + 0.5% straw (PM0.5), basal fertilizer + 1% straw (PM1), basal fertilizer + 3% straw (PM3), basal fertilizer + 1% CaCO3 (CC1), basal fertilizer + 3% CaCO3 (CC3), and basal fertilizer + 5% CaCO3 (CC5). Through the treatments, the auxiliary material application scheme that benefits the extraction of Cd from plants was evaluated. The results showed that the soil pH of pig manure and rice straw treatments was lower than that of the control (CK), with the pH of PM3 being significantly lower than CK by 0.13 and 0.09 in 2020 and 2021, respectively. In contrast, the soil pH of the calcium carbonate treatment was higher than CK, with an increase ranging from 0.89% to 4.87%. Additionally, except for the soil treated with CC1 in 2021, the pH of all other treatments showed significant changes. Compared to CK, the contents of available nitrogen, available phosphorus, available potassium, humic acid (HA), fulvic acid (FA), and the HA/FA ratio in the soil treated with pig manure or rice straw increased to varying degrees, with increases ranging from 0.28% to 466.53%. By the treatment of pig manure and calcium carbonate, there was no significant change in the content of Cd in Amaranthus hybridus L., while the application of rice straw in the previous crop soil promoted the absorption of Cd by Amaranthus hybridus L., compared with CK, 0.5% and 3% rice straw treatments increased the total accumulation of Cd in Amaranthus hybridus L. by 162.77% and 16.09%. In 2021, after the soil was treated with Amaranthus hybridus L., the total Cd content in the soil of each treatment was lower than in 2020, ranging from 0.009 to 0.109 mg·kg-1. The extraction effect of Amaranthus hybridus L. was most significant in the soil treated with 0.5% rice straw. Overall, the application of 0.5% rice straw enhanced the Cd extraction ability of Amaranthus hybridus L. |
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