Experiment and model simulation of 3,5,6-TCP transport in different farmland purple soils

Three, 5, 6-trichloro-2-pyridinol (TCP), the main degradation product of pesticide chlorpyrifos and herbicide triclopyr, exhibits strong anti-degradation ability, high water solubility and high migration capability, which would easily lead to soil and water pollution. In this study, three typical farmland soil samples were collected based on major land use of purple soil from Chinese Academy of Agricultural Agro Ecological Experimental Station (Yanting), including a sloping field sample located at higher relative elevation, a paddy field sample at lower relative elevation and a vegetable field sample close to the residential areas, corresponding to the crop rotation of wheat-corn, rice-rape and radish-cabbage, respectively. The results are important to disclose TCP transfer mechanism in purple soil, and can also provide valuble information for preventing pollution caused by the pesticide and herbicide, especially their degradation productions, to the soil and water environment in the upstream regions of Yangt