Abstract
In turf that contains thatch, pesticide mobility is largely dependent on the sorption properties of the thatch. Sorption measurements of pesticides to thatch are relatively few in number. As a result, most thatch pesticide sorption coefficients used in computer modeling efforts are obtained from pesticide property databases. These databases largely consist of sorption measurements obtained from mineral soils. Calculation of the linear distribution coefficient (Kd) from the organic carbon partition coefficient (Koc) using such databases will usually overestimate the sorption capacity of thatch. A comparison of the few studies that have measured pesticide sorption to thatch and the underlying soil suggests that thatch organic carbon has about 60% of the sorption efficiency of mineral soil organic carbon. It is proposed that improved estimates of pesticide sorption to thatch may be realized by considering the polarity of thatch organic matter.
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