ABSTRACT
The article is focused on the changes in soil characteristics caused by the drainage of agricultural soils in the Czech Republic. The basis of the research was to compare current state with the state before drainage using available historical data. To resolve the subject of the research, two smaller study areas with different soil uses were chosen. The Haklovy Dvory area is an arable land that is intensively used. The other area is used mainly for grazing (extensively) and it is called ?elezná study area. In many cases, historical data regarding the quality of surface water and groundwater (well water) in the two areas is readily available; therefore, the same approach was taken for monitoring the current quality of drainage water. Several chemical indicators were measured in the water: pH, alkalinity-acidity, overall hardness, concentration of selected cations (magnesium, calcium, potassium, ammonia), concentration of bicarbonates, nitrates, nitrites, sulphates, phosphates, chlorides and the electrical conductivity of the water. During the entire course of the monitoring, no serious water pollution was found in ?elezná study area (with the exception of one sample point). In case of the intensively managed Haklovy Dvory study area, a significant pollution in all drainage water samples was confirmed. We can safely formulate a hypothesis that the drainage water quality is related to the type of agriculture procedure practiced on the land. Mainly the intensive type of agriculture, because of the use of fertilizers, has a negative impact on drainage water quality, and subsequently on the quality of surface watercourses.