The present studies were aimed at determine the allopathic interspecies interactions of winter wheat ( Triticum aestivum L.) mixture with winter triticale ( Triticale L.) and winter rye ( Secale cereale L.), spring barley ( Hordeum vulgare L.) with spring wheat ( Triticum aestivum L.) and winter triticale ( Triticale L.) on germination and seedling growth. The preliminary intercrop influences were done in a laboratory using developing dishes. These tests allowed us to determine the allelopathic effect of tested grain species on the germinating ability of seeds of other grain crop species as well as on the length of root, coleoptiles length, fresh and air dry matter of roots and coleoptiles. The results showed that neighboring of wheat reduced germinating ability about 11%, reduced root system about 26%, and fresh matter of coleoptiles 42% as compared to the treatment with pure sowing of barley grain. There was no inhibiting influence allelopatic potential of triticale root exudates in his mixture relation with barley and wheat in grounds of analyses features. The research showed growth of germinating ability of winter wheat in mixture with winter triticale, but difference was not significant.
