A recent study conducted by a team of researchers from Manitoba and Saskatchewan suggests that a widely used fertilizer is contributing to the degradation of nearly half of the freshwater bodies in the Canadian Prairies. The fertilizer, urea, is essential for global food production, with approximately two-thirds of the world’s population relying on nitrogen-based fertilizers like urea to grow their crops. Despite its widespread use, there has been limited research on the impact of urea on aquatic ecosystems.
As part of the study, researchers added urea to farm ponds in Saskatchewan to simulate the effects of agricultural fertilization in the region. The experiment resulted in a significant increase in the growth of microscopic algae, leading to oxygen depletion in the ponds. This nutrient runoff from fertilizers entering water bodies can cause detrimental water quality issues, such as fish mortality, toxin exposure, and harmful algae blooms.
The research findings suggest that nearly half of the lakes, wetlands, and reservoirs in the Prairie region could be negatively affected by decades of urea application. The study also highlights similar vulnerabilities in agricultural areas in China and the United States. While simply stopping the use of fertilizers may not be a practical solution, the focus should be on improving fertilizer technology and soil management practices to prevent nutrient runoff into water bodies.
Experts emphasize the importance of considering other factors, such as phosphorus levels, in conjunction with urea impacts on water quality. While the study underscores the potential risks associated with urea use, it also sheds light on the need for sustainable agricultural practices to safeguard freshwater resources in the face of changing climate conditions.