Harvest residue of spring barley and oats cultivated in two-component mixture and in monoculture in an experiment carried out on medium soil during the years 1998-2000 was examined. The mass of residue, their structure and chemical composition were identified after different forecrops in crop rotations with an increasing share of cereals. The study took into account the roots accumulated in 30 cm deep layer of soil and stubble. It was shown that as far as the volume of organic residue and their contents of macroelements were concerned, the residue of the mixture represented the value in between the oats, which was most productive, and the least productive barley. Both in mixture and in monoculture of those cereals, the positions in the crop rotations did not result in significant differences in the contents of nutrients accumulated in the residues. The highest fertilizer value was represented by the mixture residue sown after potato, while the lowest – after pea and when the mixture followed the mixture. The share of spring barley and oats in the crop rotation increasing to 50 and 75% resulted in poorer residue; both the residue volume and the quality.

177-186