title: Performance evaluation of volumetric water content and relative permittivity models.
abstract: In recent years many models have been proposed for measuring soil water content (θ) based on the permittivity (ε) value. Permittivity is one of the properties used to determine θ in measurements using the electromagnetic method. This method is widely used due to quite substantial differences in values of ε for air, soil, and water, as it allows the θ value to be measured accurately. The performance of six proposed models with one parameter (i.e., permittivity) and five proposed models with two or more parameters (i.e., permittivity, porosity, and dry bulk density of soil) is discussed and evaluated. Secondary data obtained from previous studies are used for comparison to calibrate and evaluate the models. The results show that the models with one parameter proposed by Roth et al. (1992) and Topp et al. (1980) have the greatest R² data errors, while for the model with two parameters, the model proposed by Malicki et al. (1996) agrees very well with the data compared with other models.
authors.affiliation: Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia ; Department of Civil Engineering, Polytechnic Negeri Semarang, Jl. Prof. Soedarto, SH, Tembalang, Semarang 50275, Indonesia.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Mukhlisin
authors.forename: Almushfi
authors.initials: A
authors.lastname: Saputra
mesh_terms: D000383:Agriculture / Q000379:methods; D055590:Electromagnetic Phenomena; D008962:Models, Theoretical; D016062:Porosity; D012987:Soil / Q000737:chemistry*; D014867:Water / Q000032:analysis*
chemical_list: D012987:Soil; D014867:Water