Field Experiment on Solute Transport in an Unsatnrated Soil

Solute concentration and water content profile at the depth to 170cm in an area of 3×6m² during constant leaching to an unsaturated soil were measured at eight points for the determined times. Soil water movement and salute transport in the local scale were studied and the spacial variability of soil water content and concentration were discussed. As compared with the water content profile, the concentration profile shows a very great variation. The concentration profile measured at one point can not be used to represent the local scale concentration behavior. The immobile water content is about 24 to 39 percent of total water content in the experiment.