EN
The paper shows the results of monitoring of changes of the chemism of groundwaters running from the area of recreation gardens in Tarnów Mościce. Special attention has been paid to the nitrogen compounds content in waters depending on the agricultural methods used. The N-NO2 and N-NO3 contents have been assessed, accounting for the classification of groundwaters by the Polish inspectorate for Environmental Protection. It has been proved that big dozes of nitrogen, especially in soils abounding in its absorbable forms, leads to excessive washing out and contamination.