Soil Properties, Microorganisms and Plants in Soils After Amelioration—2nd Edition

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Soil and Plant Nutrition".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 1337

Special Issue Editors


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Guest Editor
Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
Interests: soil amelioration; regulation of soil carbon and nitrogen cycle; resource utilization of agricultural waste
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Interests: heavy metals; soil remediation; phytoremediation; immobilization; biochar; amendments; environmental risk
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Soil, an important substrate supporting the growth of surface organisms, is facing great degradation and pollution challenges, making soil improvement a research hotspot promoting sustainable soil use.

This Special Issue aims to gather new information about soil improvement technologies and methods, response processes, and interactions between soil and plants, alongside frontier research on biological soil improvement mechanisms.

Specifically, this Special Issue calls for original research, reviews, and small-scale reviews of soil improvement methods and mechanisms, including but not limited to the following: new materials and methods for soil improvement; soil improvement and carbon sequestration; cycling process of soil elements; soil–plant interactions; and biological mechanisms of soil improvement.

Dr. Xuebo Zheng
Prof. Dr. Hongbiao Cui
Guest Editors

Manuscript Submission Information

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Keywords

  • soil amelioration
  • microorganisms
  • interaction between soil and plant
  • soil elements cycle
  • soil carbon sequestration

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Published Papers (1 paper)

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Research

14 pages, 2471 KiB  
Article
Calcium Hydroxide–Phosphate-Modified Fly Ash Enhances the Adsorption and Stabilization of Soil Lead and Cadmium
by Hongbiao Cui, Zhi Xu, Tengfei Guo, Shaojun Hu, Ruizhi Xia, Shiwen Zhang, Yin Wang and Jun Zhou
Agronomy 2024, 14(12), 2905; https://doi.org/10.3390/agronomy14122905 - 5 Dec 2024
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Abstract
Fly ash (FA) is characterized by its porous structure and richness in silicon and aluminum oxides; thus, it can be used as an adsorbent for heavy metals. In order to enhance the absorption efficiency and stabilization effect, we prepared a new fly ash [...] Read more.
Fly ash (FA) is characterized by its porous structure and richness in silicon and aluminum oxides; thus, it can be used as an adsorbent for heavy metals. In order to enhance the absorption efficiency and stabilization effect, we prepared a new fly ash (FAKCa) using calcium hydroxide (Ca(OH)2) and phosphate (KH2PO4) through a simple one-step low-temperature alkali dissolution method and investigated its adsorption performance for lead and cadmium in water solutions and the stabilization effects of lead and cadmium in soils under flooding condition. Results showed that the Langmuir model best fit the adsorption behavior of lead and cadmium, and the maximal adsorption capabilities of lead (128 mg/g) and cadmium (39.1 mg/g) for FAKCa were increased by 236% and 14.5% compared with the unmodified FA, respectively. The adsorption of lead and cadmium by FAKCa was better fitted to the second-order kinetic model. The enhancement of adsorption capacities for lead and cadmium may be partly due to the specific surface area of FAKCa, which was increased by 94.0% compared to unmodified FA. FTIR, XRD, and XPS analysis showed that the Si-O and Al-O functional groups, carbonate, and hydroxide precipitation were facilitated by the adsorption of lead and cadmium. Thus, ion exchange, surface complexation, and formation of metal hydroxide and carbonate precipitation were the main adsorption mechanisms for lead and cadmium by FAKCa. In addition, the application of 0.1–0.6% FAKCa increased soil pH by 0.19–0.67 units and decreased the CaCl2-extractable lead by 12.3–86.5% compared to FA. Meanwhile, FAKCa was more effective in transforming lead and cadmium from exchangeable to stable fractions. This study shows that calcium hydroxide–phosphate-modified fly ash could effectively increase the adsorption and stabilization of lead and cadmium and, thus, has great potential for large-scale applications in contaminated soil. Full article
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