Multi-site Field Trials of Low-Dose Topdressing to Mitigate Cd Accumulation in Rice (Oryza sativa L.): Comparison of Different Forms of Manganese Fertilizer

Cadmium (Cd) contamination in rice is a global concern. Manganese (Mn) fertilizer is considered to be a compelling and practical agronomic measure to prevent Cd accumulation in grains. However, high doses of Mn are also toxic, while the effect of different forms of Mn fertilizer on reducing Cd absor...

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Bibliographic Details
Published in:International Journal of Environmental Research 2024-08, Vol.18 (4), Article 56
Main Authors: Zhao, Yingyue, Chen, Bin, Ma, Qiao, Wu, Weijian, Peng, Liang, Zeng, Qingru, Deng, Xiao
Format: Article
Language:English
Subjects:
Accumulation
Acidic soils
Alkaline soils
Bioavailability
Cadmium
Calcium chloride
Earth and Environmental Science
Environment
Environmental Engineering/Biotechnology
Environmental Management
Fertilizers
Field tests
Geoecology/Natural Processes
Grain
Landscape/Regional and Urban Planning
Leaching
Manganese
Natural Hazards
Research Paper
Rhizosphere
Rice
Rice fields
Soil chemistry
Soil contamination
Soil pH
Soil pollution
Soil remediation
Toxicity
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Summary:Cadmium (Cd) contamination in rice is a global concern. Manganese (Mn) fertilizer is considered to be a compelling and practical agronomic measure to prevent Cd accumulation in grains. However, high doses of Mn are also toxic, while the effect of different forms of Mn fertilizer on reducing Cd absorption in rice remains unclear. To investigate the effects of low doses (37.5 kg/ha) of different Mn fertilizers (MnCl 2 , MnCO 3 , MnSO 4 , respectively) applied as topdressing fertilizers in combination with alkaline fertilizers on reducing Cd accumulation in rice grown in typical acid Cd-contaminated paddy soil, field experiments were conducted. The findings indicate that the application of MnSO 4 led to a significant increase in soil pH by 0.18–0.27 units and a considerable decrease in CaCl 2 -extractable Cd content in the soil, ranging from 37.01 to 31.88%. Moreover, the inclusion of MnSO 4 significantly increased the soil Toxicity Characteristic Leaching Procedure-Extractable Manganese (TCLP-Mn) content by 1.75–1.86 times, thereby promoting the antagonistic interactions between Cd and Mn ions in the rice rhizosphere. Furthermore, it substantially reduced Cd accumulation in rice grains by 6.47–14.00%. Utilizing structural equation modelling (SEM) revealed that soil pH and TCLP-Mn were identified as the major factors inhibiting Cd accumulation in grains, and there exists a direct significant positive effect of soil available Cd on the Cd concentration found within grains. Collectively, the findings suggest that applying low-dose Mn fertilizer, especially MnSO 4, as a topdressing combined with alkaline fertilizers is an economical and promising strategy for remediation of Cd contaminated paddy soil. Graphical Abstract Highlights MnSO 4 induced the lowest grain Cd level. Application of MnSO 4 reducing Cd enrichment in roots and inhibiting Cd transport from roots to straw. MnSO 4 combined with alkaline fertilizers increased soil pH value and TCLP-Mn. MnSO 4 (37.5 kg/ha) at tillering reduced Cd bioavailability in soil.
ISSN:1735-6865
2008-2304
DOI:10.1007/s41742-024-00609-2