Section V

Ground-Penetrating Radar Case Histories

Although probably not employed quite to the extent of soil electrical conductivity measurement methods, such as resistivity and electromagnetic induction, there have been a substantial number of agricultural applications found for ground-penetrating radar (GPR). An historical perspective on the use of GPR for agricultural purposes and a description of the method can be found in Chapters 1, 3 and 7. Section V includes case histories describing just a few GPR agricultural applications.

One important recent development has been use of GPR to map the soil volumetric water content. Spatial maps of soil water content can be valuable for assessing soil drainage conditions and scheduling irrigation events. The Chapter 23, 24, and 25 case histories cover several aspects regarding the use of GPR to measure the volumetric water content in soil. GPR has also been used in agricultural settings (including golf courses) to delineate various subsurface features. The case histories in Chapters 26, 27, 28, and 29 provide examples for employing GPR to acquire information on subsurface features such as the orientation of preferential water flow pathways, soil layer depths and thicknesses, and the locations of buried drainage pipes. Plant root biomass determination using GPR is a fairly new area of investigation having significant implications for forestry along with planting, harvesting, and yield mapping of root crops like potatoes and sugar beets. The last case history in Chapter 30 is focused on GPR root biomass determination within forest environments. As indicated by the Section V case histories, there are certainly a variety of potential agricultural GPR applications, and there are many more GPR uses that could not be included in this section due to book length considerations.

GPR Surveys across a Prototype Surface Barrier to Determine Temporal and Spatial Variations in Soil Moisture Content

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