KINETICS OF TYLOSIN IN SOIL AND ITS INFLUENCING FACTORS

Abstract

 Antibiotics are used worldwide for treating livestock. Because a part of the antibiotics administered to livestock is excreted as feces and urine, the antibiotics in the excrement used as compost may adversely affect agricultural soils and the surrounding environment. In this study, the sorption kinetics and the degradation of the macrolide antibiotic tylosin were investigated in the following three types of soils to clarify the behavior of antibiotics in soils: andosol, brown forest soil, and gray lowland soil. Microbial degradation of tylosin occurred in andosol and brown forest soil, which contain a relatively large amount of organic matter. In gray lowland soil, the residual ratio of tylosin was remarkably low under any temperature conditions, suggesting that the high degradability of tylosin is due to a physicochemical reaction with clay minerals in the soil.