The aim of the bachelor thesis was to verify the working procedures for determining the stability of dry sieved soil aggregates and to determine the size of distributed dry sieved soil aggregates on an experimental device which is also designed to determine the stability in water. By research and work in the laboratory, we determined the size of the distributed fractions of soil aggregates in individual stands, which we subsequently found out the percentage of sizes in stands, which differed. The equipment used has proven to be highly functional and has a good application in practice.