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Full-Text Articles in Physical Sciences and Mathematics
The Cation Exchange Behavior Of Tylosin In Loess-Derived Soil, Jaime J. Call, Michael E. Essington, Sudipta Rakshit
The Cation Exchange Behavior Of Tylosin In Loess-Derived Soil, Jaime J. Call, Michael E. Essington, Sudipta Rakshit
Agricultural and Environmental Sciences Faculty Research
Tylosin (Tyl) is a veterinary antibiotic commonly used in swine and poultry production. Due to metabolic inefficiencies, it enters the environment through manure applications. Ion exchange is an important retention mechanism for Tyl, particularly for smectite clay. The objectives of this study are to characterize the exchange interactions of Tyl with common soil cations in subsoil horizons that contain smectite and to investigate the interactions using in situ Fourier transform infrared (FTIR) spectroscopy. Adsorbed Tyl in pH neutral, smectitic subsoil horizons is divided into exchangeable and nonexchangeable forms. The percentage of adsorbed Tyl that is exchangeable varies from 36% to …
Sampling Soils In A Heterogeneous Research Plot, Jianwei Li
Sampling Soils In A Heterogeneous Research Plot, Jianwei Li
Agricultural and Environmental Sciences Faculty Research
Soils are highly heterogeneous. In general, the number of soil samples required for soil research has always been determined arbitrarily and the associated accuracy is unknown. Here, we present a detailed protocol for efficient and clustered soil sampling in a research plot and, relying on a pilot sampling using this design, for demonstrating soil spatial heterogeneity and informing reasonable sample sizes and associated accuracy for future study. The protocol mainly comprises four steps: sampling design, field collection, soil analysis, and geostatistical analysis. The step-by-step procedure is modified according to former publications. Two examples will be presented to demonstrate contrasting spatial …