acid soils

Soil investigation oriented to soil reaction study took place in two agricultural farms in 2004 and it was repeated after four years again. The pH value change at total absence of liming was balanced. It was confirmed that liming ab-sence resulted in soil reaction rapid decrease in natural way - by calcium and magnesium resorption with crops, their leaching into deeper soil horizons, their outflow with erosion but also physiologically acid fertilization. In the agricul-tural enterprise Nemsova neutral and alkaline soil acreage (pH value above 6.6) decreased from 1008 ha to 190 ha in period 2004-2008 (decrease 82 per cent) and contrary soil acreage with pH value below 5.5 increased from 274 ha to 569 ha in the same period. There is even more unbeneficial situation in the agricultural farm Osikov. Acreage with pH value above 6.6 was reduced in period 2004-2008 from 1548 ha to 178 ha (decrease 90 per cent), while acid and strong acid soils (pH lower than 5.5) increased from 138 ha to 838 ha in the same period.