A recent study conducted by researchers from Manitoba and Saskatchewan reveals that a widely used fertilizer is causing significant harm to freshwater bodies in the Canadian Prairies. The study suggests that urea, a common nitrogen-based fertilizer essential for food production globally, is contributing to the degradation of nearly half of the freshwater bodies in the region.
While the impact of urea on aquatic ecosystems has not been extensively studied, the researchers from the University of Manitoba and University of Regina conducted experiments by adding urea to farm ponds in Saskatchewan to mimic agricultural fertilization practices in the southern Prairies. The results showed a tenfold increase in the growth of microscopic algae, leading to oxygen depletion in the ponds.
According to Cale Gushulak, an assistant professor at the University of Manitoba, the excessive growth of algae due to urea runoff is causing water quality deterioration and ecological imbalances in freshwater bodies. The study suggests that decades of urea use have already degraded a significant portion of Prairie lakes, wetlands, and reservoirs.
The research findings also indicate that agricultural regions in other countries like China and the United States are equally susceptible to damage from urea pollution. Gushulak emphasizes the importance of implementing better fertilizer practices and land management techniques to prevent urea from entering water bodies and causing further harm.
Another expert, Asim Biswas from the University of Guelph, notes the significance of considering how urea interacts with phosphorus in the ecosystem, particularly in shallow bodies of water with high phosphorus levels. While highlighting the potential risks associated with urea contamination, Biswas cautions against overstating the impact on entire ecosystems and advises against alarming the public.
Gushulak underscores the urgency of addressing the issue to prevent further deterioration of water quality and potential water scarcity in the face of changing climate conditions. He emphasizes the need for sustainable agricultural practices to safeguard freshwater resources and maintain ecological balance in vulnerable regions.
The study challenges the perception of Canada as a water-rich country, shedding light on the environmental challenges faced by water bodies due to widespread agricultural practices. As concerns grow over the impact of urea on freshwater ecosystems, researchers stress the importance of adopting responsible farming methods to mitigate water pollution and protect vital water resources for future generations.
