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Functionally responsive hydrogels with salt-alkali sensitivity effectively target soil amelioration.

Le Qi1, Xiao Xiao1, Ting Liu1

  • 1Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resources Utilization, Nanchang Hangkong University, Nanchang 330063, PR China.

The Science of the Total Environment
|February 2, 2024
PubMed
Summary
This summary is machine-generated.

Novel gel-coated soil modifiers significantly improve saline-alkali soil by enhancing water retention and nutrient levels. These controlled-release soil modifiers (CWR-SRMs) offer a promising eco-friendly solution for degraded agricultural lands.

Keywords:
FertilityFunctional gelsSaline-alkali soilsSoil salinity-alkalinity decreasedSynergistic mechanism

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Area of Science:

  • Agricultural Science
  • Soil Science
  • Materials Science

Background:

  • Soil salinization and alkalization are critical global agricultural challenges, leading to water dispersion and nutrient loss.
  • Existing soil improvement methods face limitations, creating a need for innovative and effective solutions.
  • Environmentally friendly gels show potential for water retention and nutrient slow-release, but their use in saline-alkali soils is limited.

Purpose of the Study:

  • To develop and evaluate novel gel-coated controlled-release soil modifiers (CWR-SRMs) for improving saline-alkali soils.
  • To investigate the characterization, performance, and application effects of CWR-SRMs in saline-alkaline environments.
  • To assess the potential of CWR-SRMs as an eco-friendly alternative for agricultural soil remediation.

Main Methods:

  • Fabrication of CWR-SRMs by spray-coating radical-polymerized gels onto composite gel beads.
  • Characterization of CWR-SRMs' thermal stability, hydrophilic group content, and encapsulation efficiency for fulvic acid-potassium (FA-K).
  • Incubation experiment (6 weeks) on saline-alkaline soil with varying CWR-SRM application gradients (0-20 cm depth) and Principal Component Analysis (PCA).

Main Results:

  • CWR-SRMs possess a 3D network structure with good thermal stability and high FA-K encapsulation efficiency.
  • The modifiers exhibit synergistic swelling and slow-release properties under saline-alkaline conditions, acting as water reservoirs and Ca2+ sources.
  • 1% CWR-SRM application significantly increased water retention (30-90%), nutrient levels (30-50%), and decreased sodium colloid content (30-60%) and pH (10-15%).

Conclusions:

  • CWR-SRMs demonstrate significant potential for improving saline-alkali soil quality and agricultural ecosystems.
  • The study highlights the effectiveness of CWR-SRMs in mitigating negative soil salinity and alkalinity impacts.
  • Novel environmentally friendly gels offer a viable alternative for addressing widespread soil degradation challenges.