Veterinary antibiotics at environmentally relevant concentrations inhibit soil iron reduction and nitrification

• Published in: Soil biology & biochemistry 2011-12, Vol.43 (12), p.2470-2472
• Main Authors: Toth, John D., Feng, Yucheng, Dou, Zhengxia
• Format: Article
• Language: English
• Subjects: agroecosystems; Agronomy. Soil science and plant productions; animal manures; animal production; Antibiotics; Biochemistry and biology; Biological and medical sciences; Chemical, physicochemical, biochemical and biological properties; Chlortetracycline; Community-level physiological profile; Fundamental and applied biological sciences. Psychology; Iron reduction; land application; microbial activity; Microbiology; Monensin; Nitrification; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Respiration; soil; Soil science; Sulfadimethoxine
• ISSN: 0038-0717; 1879-3428
• DOI: 10.1016/j.soilbio.2011.09.004

Veterinary antibiotics used in food animal production, subsequently entering the agroecosystem through land application of animal manure, constitute a growing concern. Previous studies have reported inhibitory effects of antibiotics on soil microbial activities, however, treatment concentrations in these studies were often many times greater than the ranges typically found in the environment. When spiked into manure and mixed with soil at environmentally relevant concentrations in a laboratory study, sulfadimethoxine and monensin blocked soil iron reduction over periods extending from a few days to the entire 50-Day experiment. Sulfadimethoxine also had an inhibitory effect on soil nitrification periodically over the course of the study. Respiration and community-level physiological profile parameters were not inhibited by sulfadimethoxine, monensin, or chlortetracycline. We conclude that antibiotics at environmentally relevant concentrations can disrupt soil microbial processes, although the detection of such impact may be antibiotic and/or process specific. ► Veterinary antibiotics applied at environmentally relevant concentrations. ► Sulfadimethoxine inhibited both soil nitrification and iron reduction. ► Monensin exhibited a short-duration inhibition of iron reduction. ► Chlortetracycline had no effect on soil microbial processes. ► Respiration and community-level physiological profiles were antibiotic-insensitive.