ABSTRACT
The potential impact of phosphorus (P) in accelerating eutrophication of surface waters has made evident the need for simulation models to estimate P concentrations in surface runoff and P exports from watersheds. Although much progress has been made with P simulation models, there are still difficulties in obtaining accurate estimates of runoff P. Some of these difficulties are caused in part by incomplete modeling of the mechanisms involved, as well as a lag in the incorporation of recent scientific results into models.
