ABSTRACT
One of the difculties in predicting the fate and leaching risk of eld-applied pesticides is that their transport properties are affected by soil properties that can vary greatly across the landscape. For example, the afnity of a chemical to sorb to the soil matrix has been shown to vary spatially within a eld (Cambardella et al., 1994; Rao et al., 1986; Wood et al., 1987) and even within the same soil map unit (Novak et al., 1997). Yet Loague et al. (1990) found that sorption can be the predominant process contributing to the variability of pesticide mobility across the landscape.
