Published on: 5988118. The purpose of this proposed rule is to provide requirements for agricultural operations that land-apply animal manure in the Caloosahatchee and St. Lucie River watersheds. Adherence to these requirements will reduce non-point source nutrient-related impacts within these watersheds and will help ensure that discharges from farms using manure as a fertilizer product have minimal individual or cumulative adverse impacts to state water resources.