Publications by authors named "Ulle Leisk"
J Environ Monit
January 2010
Article Synopsis
- The study assessed changes in nutrient concentrations in Estonian rivers over the past 15-20 years due to improved wastewater treatment and reduced fertilizer use and livestock numbers.
- A statistical analysis of 53 sampling sites across 40 rivers revealed a significant decrease in nitrogen concentration at 18 sites, linked to reduced fertilizer usage, lower agricultural land area, decreased pollution from point sources, and better soil-water self-purification.
- In contrast, phosphorus levels decreased in only 13 locations, with increases at 7 sites, largely due to inefficiencies in small wastewater treatment facilities and poor maintenance of drainage systems, leading to the transport of soil phosphorus into water.
