ABSTRACT
The soil water content is an important variable in soil physics and agricultural production. At small scales, TDR (time domain reectometry) probes can measure the water content and especially changes of water content with very high accuracy (Jacobsen and Schjønning, 1993; Nissen et al., 1999; Roth et al., 1990). But there is still a lack of methods suitable for larger areas and measurements of heterogeneity of soil water content. Using TDR, a high number of probes have to be installed, which leads to considerable cost and work. To determine small-scale heterogeneities, the TDR also has the disadvantage of disturbing the area by installing probes. For these cases, groundpenetrating radar (GPR) is an alternative measuring device. With respect to water content variability analysis, two different procedures based on GPR measurements can be distinguished.
