F

FAA. See Federal Aviation Administration (FAA) Fan-pattern seismic refraction surveys, 4 Faraday, Michael, 110, 111 Faraday's law, 112

Farm equipment technology, 10-11 Farm management, 270-271

Farm-Scale Intensive Cropping Study (FICS), 264-265,

267, 269-270 FDTD. See Finite difference time domain (FDTD) Feature resolution (detection), 8 Federal Aviation Administration (FAA), 183, 184 FICS. See Farm-Scale Intensive Cropping Study (FICS) Field- and landscape-scale issues, 34-35 Field and landscape scales, 59 Field-applied pesticides, 233 Field data collection modes, 100-101 Field measurements apparent electrical conductivity, 64, 68, 278-279 data collection and analysis, 319-321 geospatial measurements of ECa, 64 ground-penetrating radar methods, 319-321 Field operations, 8-9, 274 Field principles, 149 Field procedures

EM methods, 118-119 geophysical surveys, 137-138 GPR methods, 137-138 self-potential methods, 154-155 Field resistivity surveys, 95 Field-scale agronomic research, 263-264 crop yield, 268

ECa-directed soil sampling, 69-71 electrical conductivity, 255 soil salinity, 19, 27 volumetric water estimate, 48 yield data integrated by ECa, 269 Field sensor measurements, 119 Field zones, 11-12 Filtering and amplification, 139 Final orbits, 173

Finite difference time domain (FDTD), 321 Finite impulse response filter (FIR) method, 377 FIR. See Finite impulse response filter (FIR) method Fisher's least significant difference (LSD), 227 Fixed-array electrical resistivity, 248 Fixed-mode antenna arrangement, 137 Fixed offset (FO) method, 325 Florida Cooperative Soil Survey Program, 45, 46 Flux-density, 111

Fluxgate magnetometers, 148, 149 FO. See Fixed offset (FO) method Forward modeling, 124-126 Four-electrode array, 85, 93, 101 Four-electrode contact methods, 60 Fourier Transform, 115 Fox, Robert, 4 Free electrons, 170 Frequency, 161, 313 Frequency domain system, 113, 116 Fresnel, Augustin Jean, 131

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