Organic olive orchards show more antibiotic traces in soil
Rascón AJ, Fernández-García A, Moreno-Gónzalez D, Gilbert-López B, Manzaneda AJ
Soil Health
If you compost manure into your garden beds or shop for organic olive oil assuming it's chemical-free, this study is a reminder that 'organic' fertilizer can carry its own hidden residues, even if the risk here turned out to be low.
Scientists tested soil from olive groves across Spain, Portugal, Italy, Greece, and Morocco to see if antibiotic residues from manure fertilizer were building up underground. Surprisingly, organically managed groves had more antibiotic traces than conventional ones, likely because they rely more heavily on animal manure instead of synthetic fertilizer. The good news: even where residues showed up, the levels were mostly too low to pose a real risk to people or the environment.
Key Findings
Organically managed (ORG) olive grove soils had the highest overall antibiotic concentrations compared to traditional and high-density managed soils.
Traditional and high-density managed soils showed lower median antibiotic concentrations, ranging from 0.23 to 5.70 μg/kg.
Fluoroquinolones stayed concentrated in the topsoil while sulfonamides moved deeper and stratified in certain management systems; most detected antibiotics posed low to negligible toxicological risk.
chevron_right Technical Summary
Organic olive groves fertilized with manure had higher levels of antibiotic residues in their soil than conventionally farmed groves, though a five-country study found the overall health risk from these traces is low.
Abstract Preview
Original paper
Occurrence and risk assessment of antibiotic residues in Mediterranean olive grove soils with different management: an EU-wide pilot study.
Synthetic fertilizers used in agriculture are a major source of soil pollution. Sustainable soil management is crucial in maintaining long-term soil health and functionality. Implementing sustainab...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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