Wplyw czestotliwosci koszenia na zadarnianie powierzchni przez trawnikowe odmiany Lolium perenne

The aim of studies was to evaluate the performance value of domestic cultivars of Lolium perenne on a base of area sodding uniformity under conditions of different number of cuttings during vegetation period. Studies were performed in 1996-2000. Experiments were set on light mineral soil by means of randomized block in four replications. The soil was characterized with neutral reaction (pHKCI 6.9). Contents of available phosphorus, potassium and magnesium forms were: 82, 166 and 52 mg kg⁻¹, respectively. Following cultivars of L. perenne were subjected to studies: ‘Gazon’, ‘Nira’, ‘Niga’, ‘Inka’ and ‘Stadion’. Two variants of cutting frequency were applied in experiments. In the first variant A (intensive), number of cuts depending on study year was 23-26 and mineral fertilization was applied at rates: N - 240, P - 39.2, K - 121.2 kg ha⁻¹. In variant B (extensive), there were 6-10 cuts and mineral fertilization was applied at rates: N - 60, P - 17.5, K - 40 kg ha⁻¹. During vegetation in years of full performance, sodding assessment was done according to 1-9 grade COBORU scale. Study results revealed that sodding of L. perenne cultivars was variable both in years and in particular terms of observation during vegetation period.