A recent study conducted by a team of researchers from Manitoba and Saskatchewan has revealed that a widely used fertilizer, crucial for global food production, can significantly impact freshwater bodies in the Canadian Prairies. The study, led by Cale Gushulak, an assistant professor at the University of Manitoba, focused on the effects of urea, a nitrogen-based fertilizer, on aquatic ecosystems.
While approximately two-thirds of the world’s population relies on nitrogen-based fertilizers like urea for food production, there has been limited research on the fertilizer’s impact on freshwater environments. To investigate this, researchers conducted an experiment in Saskatchewan farm ponds to mimic agricultural fertilization practices in the southern Prairies.
The results showed a substantial increase in the growth of microscopic algae in the ponds, leading to oxygen depletion and ecological imbalances. Gushulak emphasized that when fertilizers intended for land use enter water bodies, it can trigger severe water quality issues. The study indicated that nearly half of Prairie lakes, wetlands, and reservoirs could be degraded due to decades of urea application.
The study also highlighted that agricultural regions in China and the United States face similar risks from urea usage. Gushulak stressed the importance of developing advanced fertilizer technologies and soil management practices to minimize the impact of urea on water bodies.
Asim Biswas, a professor at the University of Guelph, acknowledged the significance of the study but cautioned against overstating the effects of urea, pointing out the interaction between urea and existing phosphorus levels in water ecosystems. He suggested that water bodies with high phosphorus content are more susceptible to urea impacts.
Gushulak underscored that while not all water bodies may experience extreme effects from urea, the majority of agricultural areas globally share characteristics that make them vulnerable. He emphasized the need for sustainable practices to protect water resources, especially as climate change poses additional challenges to water security in the Prairies.
The research challenges the perception of abundant freshwater in Canada, highlighting the importance of addressing water quality issues to safeguard ecosystems and ensure water availability for future generations.
