In long-term microfield experience, carried out in strongly acidic sod-podzolic soil, reclaimed particles of dolomite chips of different size, the dynamics of exchangeable cations calcium and magnesium. It was shown that the increasing content in the soil of exchangeable cations occurred in the year of liming. The growth of the content depended on the particle size. It was established that the effect of the use of fractions crumbs the size of