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Soil acidification is one of the major factors of soil degradation as it disturbs the functioning of soil ecosystems, increases toxic mobile aluminium, results in reduced soil productivity. It depends on the environmental conditions as well as soil genesis. For the Western Lithuania the genetic properties of soils (depth to the carbonates is 1.5-3 m) and soil leaching regime due to rainfall surplus is common resulting in leaching of the bases cations (Ca2+, Mg2+) and natural soil acidification. Therefore soils in that region are very sensitive to the acidification and requires for the periodic liming. Moreover the big intervals between liming procedures increses soil acidity even more. In the period of 1997 when liming was performed the last time to 2007 years the area of acid soils in Western Lithuania increased by 8.5%. In 2011 year there were 36.5% of acid soils (pHKCl<5.5) in that region. Therefore the need of liming of soils in Western Lithuania is of great importance. The question is just what liming materials are more effective and what recommendations of soil acidity management should be. In order to investigate effectiveness of calcereous liming materials two experimental plots of Albeluvisols of different acidity (Eutric pHKCl 4.27 and Dystric 5.82) had been instaled, each plot was divided into 5 subplots, and each subplot in area of 50 m2 was limed with different liming materials of local origin (chalk, „agrokalkės ” (limestone and lime powder), crushed dolomite „Dirvitas”, and "kalktrąšė" (pel-lime, pelleted liming material). Experiment was performed randomly in four replicates and also control subplots without any liming were instaled in each replicate of the experimental plot. Soil pHKCl was monitored for 18 months and liming efficiency of materials used on soil potential acidity and Al mobility was evaluated. It was determined, that efficiency of liming materials depends not only on amount of pure CaCO3 but also on their origin, chemical composition, reactivity, and granuliometric composition as well as on soil acidity. The quickest effect occurred of chalk (powdered material), but it was limited as after 12 month trend of soil acidity increase was determined in Dystric while after 18 months in Eutric Albeluvisol. In spite the bigger ag-lime reactivity and amendments of active CaO+MgO the liming effect was less but more stable than that of the chalk: in the Eutric Albeluvisol the liming effect appeared after 6 months while in the Dystric Albeluvisol -- after 2 months. The crushed dolomite effect on soil pHKCl was less and statistically significant (p<0.05) just on the Eutric Albeluvisol after 18 months while no effect on Dystric Albeluvisol. Pel-lime during 18 month had no effect. [ABSTRACT FROM AUTHOR]