ABSTRACT
Precison Agriculture ............................................................ 660 18.5 Future Directions.............................................................................. 662 Acknowledgments ....................................................................................... 664 References ................................................................................................... 664
Ever since the classic paper by Nielsen et al. (1973) concerning the variability of field-measured soil water properties, the significance of within-field spatial variability of soil properties has been scientifically acknowledged and documented. Spatial variability of soil has been the focus of books (Bouma and Bregt, 1989; Mausbach and Wilding, 1991) and numerous comprehensive review articles (Warrick and Nielsen, 1980; Jury, 1985, 1986; White, 1988). The significance of soil spatial variability lies in the fact that it is a key component of any landscape-scale soil-related issue including solute transport in the vadose zone, site-specific crop management, and soil quality assessment, to mention a few.
