Liu Jiang, Kong Lingxuan, Wan Yanan, Wang Qi, Zhuang Zhong, Li Huafen
State Key Laboratory of Nutrient Use and Management, Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
Plants (Basel). 2025 Aug 13;14(16):2525. doi: 10.3390/plants14162525.
Zinc (Zn) and organic fertilizer (OF) play a dual role in both promoting plant growth and modulating cadmium (Cd) uptake. However, the individual and combined effects of soil-applied Zn and OF on Cd accumulation in wheat remain insufficiently understood, with reported outcomes varying from inhibition to promotion of Cd uptake. Therefore, this study systematically investigated the effect of Zn, organic fertilizer, and their combined treatment on the uptake dynamics of Cd and Zn in wheat plants across different growth stages. The pot culture experiments demonstrated that applying 20 mg/kg ZnSO alone significantly reduced grain Cd content by 22.3% at the mature stage. Increasing the Zn dose to 40 mg/kg further enhanced the reduction, lowering Cd accumulation by 38.9% and decreasing Cd levels from 0.23 to 0.14 mg/kg. The application of 1% OF in alkaline soil enhanced soil Cd availability but did not significantly affect Cd accumulation in various wheat organs. The combination of Zn and organic fertilizer resulted in a relatively modest grain Cd reduction of 8.4-23.0%. Generally, Zn application alone was more effective in reducing Cd accumulation in wheat, while organic fertilizer may require careful use due to its Cd-mobilizing effect in alkaline soil. The combination of Zn and organic fertilizer showed limited benefits for Cd mitigation.
锌（Zn）和有机肥料（OF）在促进植物生长和调节镉（Cd）吸收方面发挥着双重作用。然而，土壤施用锌和有机肥料对小麦镉积累的单独和联合效应仍未得到充分了解，报告的结果从抑制镉吸收到促进镉吸收各不相同。因此，本研究系统地研究了锌、有机肥料及其联合处理对小麦植株在不同生长阶段镉和锌吸收动态的影响。盆栽试验表明，在成熟阶段，单独施用20 mg/kg硫酸锌可使籽粒镉含量显著降低22.3%。将锌剂量增加到40 mg/kg进一步增强了降低效果，使镉积累量降低38.9%，镉含量从0.23 mg/kg降至0.14 mg/kg。在碱性土壤中施用1%的有机肥料提高了土壤镉的有效性，但对小麦各器官中的镉积累没有显著影响。锌和有机肥料的组合使籽粒镉含量相对适度降低8.4-23.0%。一般来说，单独施用锌在减少小麦镉积累方面更有效，而由于有机肥料在碱性土壤中的镉活化作用，可能需要谨慎使用。锌和有机肥料的组合对减轻镉污染的益处有限。
