In moderately eroded soil lessive developed from loess, the fragment-aggregate structure, originated during the tillage, unfavourably changed under the influence of rainstorm and drying. In the result of the superficial crusting and cracking, a fissury structure was formed. In the soil modified with emulsive polymer Terravest 801 the structure changes within two months after the tillage were not considerable ones. The fragment structure was stabilised, the one, which originated during the cultivation works, preceding the sewing of maize. On the other hand, in the soil conditioned with gel-forming polymer Viterra Planta-gel the large aggregates of the fragment type have completely disintegrated. In consequence, an especially favourable for the plant growth and stable structure was formed, the aggregate one, of the dominating aggregate dimensions 0,25-5 mm.