Traditional grain and vegetable row crop production with nitrogen and phosphorus based fertilizer applications, accounts for the majority of non-point nutrient sources in many watersheds including the Chesapeake Bay and Florida Everglades,
USA (Boesch et al., 2001; Sharpley, 2002;SFWMD, 2002a). The vastness of land dedicated to this type of agriculture presents a challenge for specific nutrient discharge treatment