Antibiotic uptake by vegetable crops from manure-applied soils

Area of Science:

• Environmental Chemistry
• Agricultural Science
• Food Safety

Background:

• Antibiotic use in livestock can lead to residues in manure.
• Manure application in agriculture may transfer these residues to crops.
• Assessing potential human health risks from crop uptake is crucial.

Purpose of the Study:

• To quantify the uptake of five common veterinary antibiotics by eleven vegetable crops.
• To compare antibiotic uptake from raw versus composted turkey and hog manures against inorganic fertilizer.
• To evaluate the potential health risks associated with antibiotic residues in vegetables.

Main Methods:

• Quantification of five antibiotics (chlortetracycline, monensin, sulfamethazine, tylosin, virginiamycin) in vegetable tissues.
• Analysis of vegetables grown in two soil types fertilized with different manure types or inorganic fertilizer.
• Statistical analysis to determine significant differences in antibiotic concentrations.

Main Results:

• Most vegetables showed some antibiotic uptake from manure treatments.
• Antibiotic concentrations in vegetable tissues were generally below quantification limits (<10 μg kg(-1)).
• Uptake levels were often not significantly different from inorganic fertilizer controls, indicating a matrix effect.

Conclusions:

• Antibiotic uptake by vegetables from manure application is minimal and generally below significant levels.
• Current residue levels in vegetables are unlikely to pose a health risk for the general population.
• Further research may be needed for specific antibiotic-crop-soil interactions and allergenic individuals.