Performance evaluation of volumetric water content and relative permittivity models.

摘要: In recent years many models have been proposed for measuring soil water content (θ) based on the permittivity (e) value. Permittivity is one of properties used to determine θ in measurements using electromagnetic method. This method widely due quite substantial differences values e air, soil, and water, as it allows value be measured accurately. The performance six with parameter (i.e., permittivity) five two or more parameters permittivity, porosity, dry bulk density soil) discussed evaluated. Secondary data obtained from previous studies are comparison calibrate evaluate models. results show that by Roth et al. (1992) Topp (1980) greatest R2 errors, while model parameters, Malicki (1996) agrees very well compared other