There are a number of projects underway in Wisconsin to investigate the relationship between field management and runoff phosphorus (P) losses and P loads from agricultural watersheds. This paper focuses on the field runoff P loss risk distribution found in one of those projects located in two similar watersheds within the Pecatonica River Basin. The Pecatonica River pilot project is testing Wisconsin Buffer Initiative recommendations for using targeted strategies in small agricultural watersheds (5,000 to 25,000 acres) to achieve water-quality improvement goals (http://www.nelson.wisc.edu/people/nowak/wbi/). This small watershed scale was chosen as optimal for identifying nonpoint pollution sources, implementing strategies, and measuring success.
Soil Science Extension
University of Wisconsin Madison