Modern agricultural, turf, and landscape management routinely apply and depend upon
chemical applications to optimize system function for specific outcomes. The effectiveness of these applied
chemicals to achieve desired outcomes usually depends upon their interaction with and transport by water.
To fully and accurately assess the role of water as a chemical delivery and activation system requires a
good understanding of how the applied chemicals, soil, and water interact, the scale at which a phenomenon
is important, the nature of soil variability, and which of the three dominant soil water properties
?content, movement, or potential energy? is most suited to assessing water’s role. The science of this
assessment process is extensive and its literature is voluminous. For the uninitiated, however, it is worth
being aware at least of the basics of soil water assessment and where some of the pitfalls lie. This
presentation describes soil as a three-phase system ?solids, liquid, and gases? and highlights some of the
key measurements and measurement considerations necessary to appropriately characterize treatment
efficacy for specific, and especially, non-intuitive effects. The presentation cannot be comprehensive or
substitute for requisite university-level courses in soil physics and soil chemistry, but can, perhaps, alert
applicators to situations and considerations that demand more than mere cursory assessment for proper
evaluation and interpretation
