Abstract
Soil acidity is common in all regions where the soils developed on parent materials with low base content and/or the amount of precipitation is high enough to leach appreciable amounts of bases from the surface layers. Since the 1970s more and more data indicated that soil acidification is not confined only to the soils on wet areas which were developed on acidic parent material (Sipos-Patocs, 1975; Debreczeni, 1994). After leaching the CaCOj the acid load of soil is buffered by the exchangeable cations. The neutral, slightly acidic soils are especially sensitive to acidification. On slightly acid soil the same acid load caused much bigger pH decrease than on a strongly acid one (Zsigrai, 1995).
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