The aim of this study was to determine the effect of hydrogel and mineral fertilizers on the lawn turf colour. Lawn experiment was conducted in the years 2002-2004 on experimental plots in the system of randomized blocks with an area of 4 m² (4 x 1 m) in four replications. In the conducted research experiment, the following factors were applied: botanical composition of lawn: Wembley (M1), Park (M2), Relax (M3), Półcień (M4); kind of subsoil: with the addition of hydrogel Aqua-Gel P4 (H), without the addition of hydrogel Aqua-Gel P4 (BH); type of fertilizer: Pokon (N1), Trawovit set (N2), Azofoska (N3), proposed fertilizer (N4). Each year of the study the lawn colours were evaluated. This evaluation was made according to the COBORU methodology [Domański 1992]. It was used valuation 9^o scale, where 9 meant the highest value of this feature. The colours of tested turfs to a large extent were dependent on meteorological conditions, especially the temperature and rainfall, which was confirmed in a different turf colour in each month of the growing periods. The mixture Wembley (M1) with 80% share of perennial ryegrass was characterized by the most intensive green colouration. With the decreasing of the percentage of perennial ryegrass in the mixture (irrespective of the type of substrate) the turf colouration deteriorated to the green grass colour. In subsequent years of research, intensity of the mixtures, colour slightly decreased from brown green colour (about 8^o) to the pure green (about 6^o). Applying hydrogel and proposed fertilizer to a small degree improved lawn colouration. The other fertilizers had no effect on turf colour.

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