SELECTED SOIL PROPERTIES UNDER DIFFERENT TYPES OF MANAGEMENT

Basic soil properties such as porosity, soil reaction and humic substances content and quality were evaluated in Haplic Luvisol (Uhtice, Czech Republic) after conversion of ploughing soil into permanent grassland and forest. Soil porosity \Vas calculated from physical cores. Soil reaction was measured by potentiometric method. Humic substances content was determined by short fractionation method. Generally, Haplic Luvisol (arable soil) was assessed as a high productive agriculture soil with good porosity, good humus content and quality, loamy textured, with weakly acid reaction, and high in nutrients content. Under different management systems all of studied properties have gradually changed. Three years of permanent grassland showed increasing of total organic carbon and humic substances content, which means potential for organic carbon accumulation increased. On the other hand there are some negative consequences of intensive soil exploitation such as pedocompation, decreasing of porosity and acidification after conversion. Statistically significant differences were found between arable soil and forest thrcc years after conversion.