Microplastics make fertilizer-borne antibiotics linger longer in soil
Song X, Teng L, Jiang H, Sun X, Jiang J
Soil Health
If you fertilize garden beds or pasture with biogas slurry or compost, this shows that stray bits of plastic mulch or debris can quietly extend how long antibiotic residues and resistant bacteria stick around your plants' roots.
Farmers sometimes fertilize crops with biogas slurry, a byproduct of breaking down manure and waste, which can carry leftover antibiotics. Scientists found that when tiny plastic fragments called microplastics are also in the soil, they change the soil's chemistry and help those antibiotics stick around longer near plant roots, while also shifting which bacteria thrive there. That combination could make it easier for antibiotic-resistant bacteria to build up in farmland soil, something worth watching as plastic pollution keeps accumulating.
Key Findings
Microplastics alone reduced soil bacterial diversity and lowered urease, sucrase, and alkaline phosphatase activity while boosting catalase and fluorescein diacetate hydrolase activity
Combining microplastics with biogas slurry caused soil acidification and increased retention of tetracycline, fluoroquinolone, and macrolide antibiotics compared to biogas slurry alone
The combined treatment increased Pseudomonadota and Bacteroidota abundance and linked key metabolites (prostaglandin derivatives, hydroxylated fatty acids) to antibiotic-resistance-associated genera like Pseudomonas, Bacillus, and Streptomyces
chevron_right Technical Summary
When plastic bits and treated biogas fertilizer mix in soil, they team up to make antibiotic residues stick around longer and reshape the microbial community around plant roots, raising safety concerns for using biogas slurry as fertilizer.
Abstract Preview
Original paper
Effects of biogas slurry-borne antibiotics and polypropylene microplastics on the rhizosphere microbiome and metabolome of Hybrid Pennisetum.
Antibiotic residues in biogas slurry and microplastic contamination are increasingly occurring in agricultural soils. However, their combined effects on rhizosphere ecological processes remain poor...
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