ABSTRACT
ABSTRACT: Based on the correlation model of soil dielectric constant-water content, the Time Domain Reflectometry (TDR) were used for estimating soil water content. Firstly, the features of Topp model, Mixing model and Diffusion model were compared. Then, the causes of errors in each model were analyzed with test data. The results show that the parameters of Mixing model and Diffusion model are too randomly to be determined. Although the Topp model causes deviations without considering the soil components, it can get good fitting effect in practical application with simple revision.
