General considerations for geophysical methods applied to agriculture / Barry J. Allred, M. Reza Ehsani, and Jeffrey J. Daniels -- Past, present, and future trends of soil electrical conductivity measurement using geophysical methods / Dennis L. Corwin -- History of ground penetrating radar applications in agriculture / M.E. Collins -- Theoretical insight on the measurement of soil electrical conductivity / Dennis L. Corwin, Scott M. Lesch, and Hamid J. Farahani -- Resistivity methods / Barry J. Allred, Jeffrey J. Daniels, and M. Reza Ehsani -- Electromagnetic induction methods / Jeffrey J. Daniels, Mark Vendl, M. Reza Ehsani, and Barry J. Allred -- Ground-penetrating radar methods / Jeffrey J. Daniels -- Additional geophysical methods with probable significant future use in agriculture: magnetometry, self-potential, and seismic / Barry J. Allred and Michael Rogers -- Integration of global positioning systems (GPS) into agricultural geophysics / Dorota A. Grejner-Brzezinska -- Integration of geographic information systems (GIS) with agricultural geophysics / Carolyn M. Merry -- Resistivity and electromagnetic induction case histories -- Ground-penetrating radar case histories.