American soil losing more crop nutrients due to heavier rainstorms, study shows
Loss of phosphorus from agricultural lands is increasing due to heavier storms, potentially threatening crop growth, according to team led by researchers at Penn State

November 18, 2024. By Adrienne Berard

UNIVERSITY PARK, Pa. — Phosphorus, a nutrient in soil essential for sustaining most forms of life, is increasingly disappearing from land as it is washed into waterways throughout the United States, according to a new study led by researchers at Penn State.

The study, published today (Nov. 18) in the Proceedings of the National Academy of Sciences, analyzed data from 430 rivers across the U.S. and found that phosphorus loss from agricultural lands has increased over the past four decades, despite efforts to reduce it. This loss of phosphorus can potentially lead to decreased crop yields, which could drive up the cost of food, the researchers explained.

“We’ve seen from recent weather events that water quantity, the amount of water that storms and waterways carry, can lead to dangerous flooding and mudslides,” said Li Li, professor of civil and environmental engineering at Penn State and corresponding author on the study. “What we wanted to understand is what happens to the land when these storms pull the subsurface of the soil into rivers and streams. What we found is an alarming loss of this finite element that lets soil sustain life.”

Phosphorus plays an essential role in various biological processes, like creating DNA structure and facilitating the energy transfer between cells, Li explained. But unlike nitrogen, another critical soil nutrient, phosphorus is a non-renewable resource with limited geological deposits, meaning that once it moves from land to water, it can’t get back into the land.

…