Composted PBST Biodegradable Mulch Film Residues Enhance Crop Development: Insights into Microbial Community...

Area of Science:

• Agricultural Science
• Environmental Science
• Soil Science

Background:

• Biodegradable mulch film (BDM) is promoted to reduce plastic pollution, degrading into CO2 and H2O.
• Commercial BDM often leaves residues, forming microplastics (MPs) and threatening soil ecosystems.
• Understanding BDM residue impacts on plant growth and soil health is crucial.

Purpose of the Study:

• To evaluate the effects of raw BDM material (R), BDM residues (M), and composted BDM product (P) on Chinese cabbage growth.
• To assess the impact of these treatments on soil quality and microbial communities.

Main Methods:

• Pot experiments were conducted throughout the entire growth cycle of Chinese cabbage.
• Evaluated treatments included PBST-BDM raw material (R), residues (M), and composting product (P) at varying concentrations.
• Assessed crop growth parameters (emergence rate, height, leaf area, biomass) and analyzed soil microbial networks and metabolites using PCoA and PLS-DA.

Main Results:

• Raw BDM (R) showed minimal effects on growth, with a slight increase in emergence rate.
• BDM residues (M) significantly inhibited emergence rate, plant height, leaf area, and biomass.
• Composted BDM (P) enhanced Chinese cabbage growth, with improved outcomes at higher concentrations, and altered microbial networks towards symbiotic interactions.

Conclusions:

• BDM residues negatively impact crop growth and soil health, contrary to theoretical biodegradability.
• Composting BDM may reduce adverse ecological effects by promoting residue breakdown.
• Further validation of composting feasibility and scalability under field conditions is necessary.