A recent study conducted by researchers from Manitoba and Saskatchewan revealed that a widely used fertilizer, essential for global food production, could potentially harm almost half of the freshwater bodies in the Canadian Prairies. The study focused on the impacts of urea, a nitrogen-based fertilizer, on aquatic ecosystems, an area that has not been extensively researched before.
The research experiment, led by Cale Gushulak, an assistant professor at the University of Manitoba, involved adding urea to farm ponds in Saskatchewan to simulate the effects of agricultural fertilization in the southern Prairies. The results showed a significant increase in the growth of microscopic algae, leading to oxygen depletion in the ponds. This phenomenon can have detrimental effects on aquatic life, including fish mortality, toxin exposure, and harmful algae blooms.
The findings suggest that prolonged use of urea in agricultural practices could degrade nearly half of the lakes, wetlands, and reservoirs in the Prairie region. The research also indicated that similar vulnerabilities exist in agricultural areas in China and the United States.
While the study emphasizes the need for better fertilizer management practices to prevent urea from entering freshwater bodies, Asim Biswas, a professor at the University of Guelph, highlights the importance of considering the interaction between urea and existing phosphorus levels in water ecosystems. He cautions against drawing generalized conclusions about the ecosystem’s tipping point due to urea impacts.
Gushulak emphasizes that despite the potential risks posed by urea, not all water bodies worldwide may experience its extreme effects. However, given the prevalence of high phosphorus levels and shallow water bodies in many agricultural regions globally, the susceptibility to urea pollution remains a concern.
The study challenges the perception of Canada as a country abundant in freshwater, as many water bodies face quality degradation due to various factors, including urea contamination. Gushulak warns that continued penetration of urea into freshwater systems could lead to deteriorating water quality and increased water scarcity, especially as climate change impacts water availability and security in the Prairies.
