Agricultural Pressures on the Quality of Ground and Surface Waters in Catchments of Artificial Reservoirs

Changes in nutrient concentrations groundwater were investigated to determine the impact of agriculture on water quality artificial lakes. The study covered three reservoirs an agricultural area Wielkopolska (central-western part Poland). Assessing required a network piezometers around reservoirs, used degree pollution from nutrients supplied reservoirs. Moreover, analysis streams flowing into and themselves. Field research was conducted every month growing season March November. land inclination, ground permeability, soil type. Detailed objectives included: (1) assessment chemical parameters surface quality, (2) evaluation different sources regards their management. This revealed high dynamics concentrations, particularly for nitrates phosphates, water. A significant effect maize cultivation increase nitrate catchment Przeb?dowo Reservoir evidenced, as well substantial functioning animal farm groundwaters Lachotka Reservoir. load origin Miedzichowo relatively low. Our elevated amounts such nitrogen phosphorus, detected more frequently than running waters, which confirms our hypothesis importance detecting source studied High recorded leached arable fields also observed summer period, failing confirm that greatest factors would be related spring (lack compact vegetation cover, level, etc.). indicated greater type use lithology or permeability deposits.