The species composition, number and distribution of weed seeds sampled from three layers of soil for different tillage systems have been investigated. A total of 22 weed species was recorded. The ploughless and direct sowing objects showed the occurrence of weed seeds which were not recorded in plough tillage. Both for tillage systems and for respective soil layers, the greatest share of seeds (from 77 to 84%) was accounted for by three species: Chenopodium album L., Stellaria media Vill. and Viola arvensis Murr. Irrespective of the soil layer depth, the greatest total number of seeds was recorded in plough objects, slightly fewer in ploughless and significantly less – in direct sowing. In all the tillage systems the greatest number of seeds was recorded in the topsoil and significantly less – in deeper layers.

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