The study was carried out on the basis of two lawn experiments, which were founded in the split-block split-plot with four replications. The experimental unit was a plot with an area of 1 m². For investigate purposes was detailed the kind of the lawn and was called it as monoculture (pure sowing) and-mixed. The criterion for the division of mixtures was sharing of red fescue in sowing. In pure sowing were studied four cultivars of red fescue: Adio, Libano, Corail, Simone. In the, monoculture’s and mixtures experiment were examined the following factors: the type of subsoil with the addition of hydrogel Aqua-gel P4 (H) and without the addition of the hydrogel Aqua-gel P4 (BH), years of study (2003-2004). In the conducted experiments moderately intensive care (so-called Relax) was used. At the end of each growing period in all plots from selected places chosen in a random way, the samples of turf with the root system were taken. In this study applied the hydrogel (Aqua-gel P4) caused an increase in root biomass in both in the monoculture turf of tested red fescue cultivars and in mixtures. Among the tested cultivars of red fescue the greatest root biomass in years of study produced the Polish cultivar Adio, and from mixtures, only those that had in its composition of 60 and 80% red fescue. The action of the hydrogel to produce turf root biomass was particularly significant, when in the summer 2004 drought occurred. It may indicate its beneficial effects particularly in situations of water shortages in the soil.

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