Quantity and vertical distribution of fine roots (diameter up to 0.2 cm) were studied in a 80-year-old spruce forest growing in the Low Tatras Mts in the Slovak Republic. The total biomass of fine roots in the LFH horizon and the mineral soil to a depth of 0-20 cm was from 1570 kg per ha (in the year 2002) to 2180 kg per ha (2001). Fine root density was almost 2.5 times higher in the LFH horizon than in the mineral soil at a depth of 10-20 cm. Influences of liming (Varinit) and fertilization (NPK with ratio of elements 8:14:22) on fine root biomass were analyzed as well. Fine root biomass was stimulated in the LFH horizon in the case of liming by Varinit, and in the mineral soil with a depth of 0-10 cm following NPK fertilization. Positive changes in chemical properties of soil, particularly in pH, Ca, Mg, K, and Al, were recorded two years after liming and fertilizing treatments.