Read the full story from the American Society of Agronomy.
Add just enough fertilizer, and crops thrive. Add too much, and you may end up with contaminated surface and groundwater.
Excess nutrients from farms can be transported to groundwater reservoirs by water starting at the surface and flowing through soil. But the flow of water through soil is a “highly dynamic process,” says Genevieve Ali, a researcher at the University of Manitoba. “It can vary from year to year, season to season, or even rainstorm to rainstorm.”
It can also fluctuate depending on soil type and even if organic additions, like manure, are applied.
Ali is lead author of a new study that shows water infiltrates deeper into cracking clay (vertisolic soils) when liquid hog manure is applied.