The 1998-2000 experiments investigated the effect of plough and ploughless tillage systems and varied fertilization and chemical control levels on winter rye residues weight and chemical composition. It was observed that a greater dry matter of winter rye roots was accumulated in 0-10 cm soil layer, as compared with 10-20 and 20-30 cm layers. The winter rye objects intensively fertilized and chemically controlled recorded significantly more post-harvest residues. The plough-tillage objects showed that winter rye roots accumulated more total nitrogen, potassium and magnesium as compared to ploughless tillage. The content of total nitrogen and potassium in rye roots was greater for objects with basic fertilization and chemical control. A greater content of phosphorus in stubble and mulch was recorded for ploughless tillage and potassium – plough tillage. As for the basic fertilization, stubble and mulch of winter rye contained significantly more total nitrogen and phosphorus than the intensively fertilized and chemically-controlled plots.

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