The physical and chemical properties of soil and substrate are different, so the moisture sensors can not be used directly for measuring the substrate moisture due to the great errors.

To achieve rapid moisture detection of culture media, dielectric type EC-5 soil moisture sensor was used to make adaptive test with substrate in different proportions.

For the sake of studying the characteristics of SWR soil moisture sensor, the soil cylindrical tube experiment is designed and the experiment modeling and performance analysis are done in this thesis.