Over 2002-2005 at Mochełek in the vicinity of Bydgoszcz two-factor field experiments were performed which aimed at comparing the reaction of winter rye and triticale on the stand after spring cereals: barley, oat, wheat, triticale and fallow. The experiment was located on typical Luvisol of the good rye soil complex, IVa soil valuation class. The difference in the effect of the forecrops on both winter cereal species was evaluated based on the significance of the interactive effect of the stands on the structural yield components and the grain yield and their variation as affected by the forecrops. It was observed that on average over the research period the reaction of winter cereals to the forecrop was similar, and their structural yield components and grain yields did not depend on the stand. However in respective years the spring cereals and fallow as forecrops differently affected the ear density and grain yield in winter rye than in winter triticale. In the year most favorable for winter cereals yields the reaction of winter rye and triticale on spring cereals and fallow was the same. In these conditions the winter cereals yielded best on the stand after oats.

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