Effects of Organic Soil Amendments on Antimicrobial-Resistant Bacteria in Urban Agriculture Environments

Urban Farm DB summary

This study explored the impacts of biological soil amendments of animal origin (BSAAOs) on antimicrobial-resistant (AMR) bacteria in leafy vegetable production environments across seven urban farms and community gardens in the Washington D.C. area. Amended plots showed significantly higher concentrations of total heterotrophic bacteria than bulk soil, which was associated with reduced fractions of tetracycline-resistant bacteria and case-specific trends for reduced ampicillin-resistant bacteria and coliforms. Soil pH positively correlated with tetracycline-resistant bacteria in amended soils, suggesting pH-targeting management strategies could control related risks.