The aim of the investigation was to compare yielding and economic efficiency of crops in pure stand and mixed crops. One-factor field experiment was carried out at the Mountainous Experimental Station at Czyrna, in the vicinity of Krynica (the Beskid Niski Range) between 1996 -2002. Pure stands (4 species) and five mixtures were compared. The following crops were grown in pure and mixed stands: ‘Dukat’ covered oats, ‘Migo’ spring triticale, ‘Rodos’ spring barley and ‘Kwarta’ spring vetch. As a result of the investigation it was observed that out of both pure and mixed stands, the mixture containing spring barley and spring triticale showed the highest average grain yield. In mixtures spring barley enhanced spring triticale yielding more than oats. For spring barley in mixtures oats was more favorable than spring triticale, while spring vetch was a better partner for oats than spring barley and spring triticale. The highest economic efficiency index value was recorded for pure stand of spring barley. The values calculated for the other pure stands and mixed crops were lower and were as follows (in the decreasing order): mixture containing spring barley and spring triticale, spring triticale in pure stand, mixture containing oats and spring barley.

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