August 2025 issue

Volume 58, Issue 8

This month, we focus on managing legacy phosphorus (P) with two articles. One article discusses how legacy P impacts crop production, soil tests, and long-term sustainability of fertilizer practices across U.S. cropland, emphasizing the 4R nutrient stewardship framework. The other article addresses the environmental and water quality impacts of legacy P in the Lake Erie watershed and emphasizes regional conservation strategies, hydrological variability, and collaborative, adaptive management to mitigate P runoff and its effects on harmful algal blooms.

Cover: Illustration courtesy of the USDA Legacy Phosphorus Project.