The waste activated sludges had a significant influence on the content of macroelements in Lolium multiflorum whereas waste activated sludges from the Drosed Co. were a better source of nutrients for plants than the waste activated sludge from Siedlce. All other parameters investigated, such as type of soil and liming also had a significant influence on the features investigated.
The yield of Lolium multiflorum harvested after fertilization with waste activated sludges from both sewage purification plants were higher than from the control and FYM objects. Total sulphur content in plants was very differentiated (i.e. it ranged from 1.0 to 8.4 g kg-1 of DM) and depended on all experimental parameters investigated.