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Related Experiment Video

Updated: Aug 31, 2025

Separation and Identification of Conventional Microplastics from Farmland Soils
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Microplastics in soil can increase nutrient uptake by wheat.

Yuhuai Liu1, Mouliang Xiao2, Muhammad Shahbaz3

  • 1College of Life Sciences, Jiangxi Normal University, Nanchang 330022, PR China.

Journal of Hazardous Materials
|August 24, 2022
PubMed
Summary

Microplastics alter crop nutrient uptake. Polyethylene (PE) microplastics increased wheat

Keywords:
EnzymeHotspotMicroplasticNutrient-acquisition strategiesRhizosphere and bulk soil

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Microbiology

Background:

  • Microplastics (MPs) are emerging contaminants in agricultural soils.
  • The impact of MPs on crop nutrient acquisition strategies is not well understood.
  • Soil microbial communities play a crucial role in nutrient cycling and availability for plants.

Purpose of the Study:

  • To investigate the effects of polyethylene (PE) and polyvinyl chloride (PVC) microplastics on the nutrient-acquisition strategies of crops and associated microbial communities.
  • To elucidate the mechanisms by which microplastics influence nutrient turnover in the rhizosphere.
  • To assess the differential impacts of PE and PVC microplastics on key soil enzymes involved in nutrient cycling.

Main Methods:

  • Wheat was grown under controlled conditions with varying concentrations (0%, 1%, 5% w/w) of PE and PVC microplastics.
  • Rhizosphere microbial activity, specifically β-1,4-glucosidase (BG), 1,4-N-acetyl-glucosaminidase (NAG), and phosphomonoesterase (PHOS) enzyme activities, were analyzed.
  • Hotspot analysis and rhizosphere expansion of enzyme activities were quantified to assess nutrient acquisition potential.

Main Results:

  • PE microplastics, particularly at higher concentrations, increased the demand and consumption of ammonium (NH4+-N) and nitrate (NO3--N) by wheat.
  • PVC microplastics limited the utilization of available nitrogen (N) and phosphorus (P), forcing plants to acquire nutrients from a narrower root zone.
  • Microplastic addition altered microbial nutrient turnover, affecting the expansion and activity hotspots of BG, NAG, and PHOS enzymes.

Conclusions:

  • Microplastics significantly impact crop nutrient acquisition by altering soil microbial functions and nutrient availability.
  • PE and PVC microplastics exert differential effects, with PE potentially increasing nutrient demand and PVC restricting nutrient access.
  • Understanding these microplastic-induced changes is crucial for managing soil health and crop productivity in contaminated agricultural systems.