A recent study conducted by a team of researchers from Manitoba and Saskatchewan reveals that a widely used fertilizer is causing significant harm to freshwater bodies on the Canadian Prairies. The fertilizer, known as urea, is essential for global food production, with approximately two-thirds of the world’s population relying on it and other nitrogen-based fertilizers. Despite its importance, there has been limited research on the impact of urea on aquatic ecosystems.
The researchers conducted an experiment by adding urea to farm ponds in Saskatchewan to mimic the effects of agricultural fertilization in the region. The results showed a substantial increase in the growth of microscopic algae, leading to oxygen depletion in the ponds. This excess algae growth was found to be detrimental to the aquatic ecosystems.
According to Cale Gushulak, an assistant professor at the University of Manitoba, the excessive use of urea can lead to severe water quality degradation, resulting in oxygen loss, fish mortality, increased toxin exposure, and harmful algae blooms. The study suggests that almost half of the Prairie lakes, wetlands, and reservoirs may have been negatively impacted by decades of urea use.
Gushulak emphasizes the need for better fertilizer management practices to prevent urea from entering freshwater bodies. While the study highlights the vulnerability of agricultural regions in China and the United States to urea damage, Gushulak stresses the importance of implementing improved agricultural techniques rather than discontinuing fertilizer use altogether.
Asim Biswas, a professor at the University of Guelph, acknowledges the significance of the study but cautions against overstating the impact of urea on water bodies. He emphasizes the interplay between urea and phosphorus in ecosystems, noting that high phosphorus levels in shallow water bodies increase the susceptibility to urea impacts.
Despite the potential localized effects of urea, Gushulak warns that many agricultural areas worldwide share similar characteristics to the Prairie region, making them susceptible to water quality issues. The study challenges the perception of abundant freshwater resources in Canada, highlighting the importance of addressing water quality concerns for the sustainability of ecosystems and human life.
Looking ahead, Gushulak raises concerns about the future of water resources as climate change intensifies, leading to greater fluctuations in water levels. He underscores the need for proactive measures to safeguard water security amidst evolving environmental challenges.