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Introduction
The main purposes of this paper are to summarize briefly the key practices and research regarding the techniques and applications of mathematical models that can predict the offsite transport of turfgrass chemicals to water resources and to offer suggestions for improvement. These models are important tools for risk assessment and risk management of turfgrass chemicals, but their use also has strong potential to produce results that deviate significantly from reality. To put the subject area in context, the first discussion indicates the significant extent to which turfgrass is managed with chemicals in the United States. After that, a definition of mathematical models in the current context provides a basis for the rest of the paper. Examples of the implications of using inappropriate input parameters are given.