Corn monoculture soils breed more antibiotic-resistant bacteria than diverse farms
Nickodem CA, Tran PQ, Neeno-Eckwall E, Naing N, Sanford GR
Soil Health
The soil under a diverse backyard vegetable bed or crop-rotated farm plot is quietly doing you a favor by keeping antibiotic-resistant bacteria in check, something a chemically dependent monoculture can't manage as well.
Scientists compared soil from different types of farms and found that fields planted with the same crop year after year and treated heavily with chemicals harbored more genes that let bacteria resist antibiotics. Farms that rotated many different crops and used fewer inputs had healthier, more diverse soil microbes, which seemed to naturally crowd out the resistant bacteria. It's a reminder that how we farm shapes hidden microscopic communities with real consequences for human and animal health.
Key Findings
Intensive monoculture systems typical of the US Corn Belt showed significantly higher abundance and diversity of antibiotic resistance genes (ARGs) and mobile genetic elements compared to diversified systems.
High-risk resistance genes like tetA and blaPAM, relevant to both livestock and human health, were more transmissible in intensive monoculture soils, likely via gene integration and excision mechanisms.
Lower-input systems with diverse crop rotations maintained resistomes with lower abundance, diversity, and transmission potential, correlating with greater overall soil microbial diversity.
chevron_right Technical Summary
A large field study found that intensive, chemical-heavy corn monocultures build up more antibiotic-resistant bacteria in soil than diversified, lower-input farming systems, suggesting how a field is managed matters as much as antibiotic use itself for spreading resistance.
Abstract Preview
Original paper
Soil management practices shape the abundance, diversity, and spread of antimicrobial resistance.
Agricultural soils are critical hotspots of antimicrobial resistance genes (ARGs). Yet, the environmental factors shaping these reservoirs and the hazards they pose to humans and livestock remain p...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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