| Effects of different passivating agents on cadmium reduction in soil and kiwi fruit |
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| DOI：10.7606/j.issn.1000-7601.2026.02.21 |
| Key Words: kiwi fruit passivating agent soil cadmium reduction effect distribution of cadmium in plants |
| Author Name | Affiliation | | ZHAO Shaoting | Xi’an Agricultural Technology Extension Center, Xi’an, Shaanxi 710061, China | | CAO Yingfei | Shaanxi Transportation Holding Green Development Group Co.Ltd., Xi’an, Shaanxi 710018, China | | LI Sen | Shaanxi Transportation Holding Green Development Group Co.Ltd., Xi’an, Shaanxi 710018, China | | LI Tong | Xi’an Agricultural Technology Extension Center, Xi’an, Shaanxi 710061, China | | ZHANG Chenyang | Xi’an Agricultural Technology Extension Center, Xi’an, Shaanxi 710061, China | | ZHAO Siqi | Xi’an Agricultural Technology Extension Center, Xi’an, Shaanxi 710061, China | | BU Feng | Zhouzhi Soil and Fertilizer Workstation, Xi’an, Shaanxi 710400, China | | DAI Yunchao | College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to study the effects of passivating agents on the cadmium content of soil and kiwifruit, a completely random block design was adopted in the field with kiwifruit ‘Xuxiang’ as the experimental variety. The effects of 25 kg·hm-2 lime (C), 450 kg·hm-2 organic fertilizer (O), 120 kg·hm-2 biochar (B), and 40 kg·hm-2 calcium\|magnesium phosphate fertilizer (P) on cadmium (Cd) content in soil and kiwifruit were investigated. The results showed that compared with the control, the soil pH increased by 0.21 to 1.83, and the increase in cation exchange capacity was 3.44% to 26.47%. The application of organic fertilizer (O treatment) and biochar (B treatment) increased soil organic matter by 39.18% and 25.79%, respectively. After application of passivating agent, the reductions of total Cd and available Cd in the soil by different passivators were 1.00% to 3.90% and 24.40% to 44.50%, respectively. The passivating agents facilitated the conversion of exchangeable Cd (EXC-Cd) to carbonate\|bound (CAR-Cd), oxide\|bound (OX-Cd), or organic matter\|bound Cd (OM-Cd). The distribution trend of Cd content in different parts of kiwifruit was root > branch > leaf > fruit. Different treatments significantly decreased the Cd content in kiwifruit fruit, roots, branches, and leaves by 47.83% to 87.44%, and the B treatment had the best effect compared with the CK treatment. The Cd enrichment coefficients of kiwifruit in all treatments were significantly decreased, and B treatment had the lowest Cd enrichment coefficient. The root decreased by 66.09%, the branches decreased by 73.19%, the leaves decreased by 87.30%, and the fruits decreased by 84.47%. In addition to C treatment, the transport coefficients of Cd in different parts of kiwifruit were decreased. The transport coefficients of Cd in different parts of kiwifruit plants in the B treatment decreased most significantly from root to branches by 20.86%, from branches to leaves by 52.46%, and from branches to fruits by 41.45%. In conclusion, the application of these four passivating agents has significant effects on reducing soil Cd content, changing soil Cd forms, reducing kiwifruit Cd content, and inhibiting Cd accumulation and transport in kiwifruit. The best effect is achieved by applying of 120 kg·hm-2 biochar. |
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