Adsorption and leaching of tebuthiuron in soil.

Adsorption and leaching of tebuthiuron in soil and their affecting factors were studied with vibrating equilibrium method and column leaching method.Results show that adsorption of the substance in 5 soil samples tested was well fitted with a linear model.The soils followed an order of Northeast China black soil Taihu region paddy soil Jiangxi red soil Nanjing yellow brown soil Shaanxi fluvo-aquic soil in terms of tebuthiuron adsorption capacity.Their adsorption constant ranged between 0.19 and 2.87 mL·g-1,indicating that their adsorption capability was rather low.The leaching experiments of tebuthiuron in the three typical soils show that tebuthiuron was quite leachable,and the soils followed an order of Jiangxi red soil Taihu region paddy soil Northeast China black soil.The main factor affecting the adsorption and leaching of tebuthiuron was organic matter content in the soil.