February 2025 issue

Volume 70, Issue 2

Renowned researcher Dr. Andrew Sharpley had a nearly 45-year career focused on addressing agricultural phosphorus management, particularly its impact on water quality. Sharpley, known for his expertise in nutrient chemistry, soil physics, systems biology, and more, played a pivotal role in developing the Phosphorus Index (P Index), a tool designed to assess and mitigate phosphorus runoff from agricultural fields. His leadership, marked by consensus-building, mentorship, and intellectual collaboration, was key to the creation of the Phosphorus Index and its adoption across the United States. An upcoming special section in Journal of Environmental Quality honors Sharpley’s legacy.

Cover: Andrew Sharpley poses for a photo to illustrate his commitment to clean waterways and drinking water, coupled with the importance of agriculture. Photo courtesy of Deanna Osmond.