A recent study conducted by a team of researchers from Manitoba and Saskatchewan reveals that a widely used fertilizer essential for feeding a large portion of the global population can potentially harm almost half of the freshwater bodies in the Canadian Prairies. While the study highlights concerning implications, one expert suggests that the findings may be overstated.
Urea and other nitrogen-based fertilizers are crucial for food production worldwide, with around two-thirds of the global population relying on them. Despite their importance, there has been limited research on the impact of urea on aquatic environments. As part of the study, researchers from the University of Manitoba and University of Regina introduced urea into farm ponds in Saskatchewan to mimic the effects of agricultural fertilization in the southern Prairies.
The experiment resulted in a significant increase in the growth of microscopic algae, leading to oxygen depletion in the ponds. This transference of fertilizer from land to water can cause severe water-quality issues, according to Cale Gushulak, an assistant professor at the University of Manitoba. The widespread use of urea globally raises concerns about its potential environmental consequences.
The research findings suggest that the excessive growth of algae, oxygen loss, and other water quality issues observed in the experiment could already be affecting numerous water bodies in Saskatchewan. The study indicates that nearly half of the lakes, wetlands, and reservoirs in the Prairie region could be degraded due to decades of urea application.
Gushulak emphasizes the need for improved fertilizer practices and land management to prevent fertilizer runoff into water bodies. While acknowledging the significance of the study, Asim Biswas, a professor at the University of Guelph, underscores the importance of considering interactions between urea and existing phosphorus levels in water ecosystems.
Despite the potential risks associated with urea, Gushulak stresses that not all water bodies worldwide may experience its most severe effects. However, many agricultural regions, particularly those with fertile lowlands and shallow water bodies, remain vulnerable to the impacts of urea contamination. The study challenges the perception that Canada, known for its abundance of freshwater, is immune to water quality issues, highlighting the importance of safeguarding water resources for future generations.