Girl Planting seeds

When yesterday's agriculture feeds today's water pollution

A study led by researchers at Université de Montréal quantifies for the first time the maximum amount of nutrients—specifically, phosphorus—that can accumulate in a watershed before additional pollution is discharged into downriver ecosystems.  That average threshold amount is 2.1 tonnes per square kilometre of land, the researchers estimate in their study published today in Nature Geoscience. "Beyond this, further phosphorus inputs to watersheds cause a significant acceleration of (phosphorus) loss in runoff."  This amount is shockingly low, the researchers say; given current nutrient application rates in most agricultural watersheds around the world, tipping points in some cases could be reached in less than a decade.  Read more...

 

Back

 
 
close (X)