EN
On the basis of turf cultivars testing in few regions of Poland during 1991-98 and literature studies, the ranking of specics tolerant to common stress conditions was presented. As an example of Poa pratensis cultivars it has been demonstrated relationship of turf quality (OA) under different type of maintenance: extensive (Park and Eko), medium intensive (Relax) and extensive (Sport) and seed yielding character. In other test it has been shown efficiency of resistance to stresses of Festuca rubra, endophyte-containing cultivar. The group of species were proposed to following stresses: drought, high moisture, wearing, low cutting, shade, toxicity of soil and severe winter. It was shown seed production of grass species in Poland and European Union with taking into consideration the species of minor agriculture meaning. Cultivars tests showed high correlation the turf quality between Relax, Park and Eko maintenance (r = 0.73, r = 0.90) and low correlation coefficients between Sport maintenance (r = -0.19, r = 0.22). The cultivars differed significantly in height of plants (max. to 260%) and seed yielding (max. to 270%). It was confirmed that seed infection by Acremonium can improve some stress resistance of cultivar, but these effect in average value OA was not so big.