Production of plant biomass at the analyzed site varied widely. The highest harvested biomass was obtained in the bed with common reed and it was 13.4 Mg DM ha−1 (Table 2). Solanol et al. (2004), analyzing the research results obtained from a similar facility, determined the yield of reed dry matter at 12 Mg DM ha−1 which is lower than values found in literature – 17 Mg DM ha−1 (Vymazal and Kröpfelová, 2005 and Barbera et al., 2009).