EN
The studies were carried out in laboratory conditions. Poa pratensis root exudates were obtained in the CRETS (continuous root exudate trapping system) and then in glass platter experiment was determined their biological activity in biotest on seed germination, length of roots and height of Phleum pratense seedlings. In the experiment were used the following concentrations of Poa pratensis root exudates: 0,80%, 0,40% and 0,20%. Conducted studies showed that higher concentrations of Poa pratensis root exudates (0,80% and 0,40%) caused total inhibition of germination. Lower concentrations of exudates significantly limited number of germinated seeds and inhibited of root elongation and growth of tested species seedlings. These results indicate that Poa pratensis root exudates seem to include chemical compounds of allelopathic nature.