In a 3-year pot experiment, the fertilizing value was investigated of fresh and 3 month composted waste activated sludges, FYM and their mixtures with CaO and brown-coal ash. Higher yields of maize and sunflowers were achieved from objects fertilized with waste activated sludges with the addition of ash than those with the addition of CaO or without any addition. The effectiveness of waste activated sludges from Siedlce and Łuków, applied as either fresh or composted, was similar. Higher yields were achieved from objects fertilized with waste activated sludges than fertilized with FYM. The content of nitrogen was higher in the biomass of maize and sunflower harvested from objects fertilized with only waste activated sludges than those with mixtures of waste activated sludges with CaO and brown-coal ash. The highest value of nitrogen utilization coefficient calculated for the whole period of the experiment was achieved from objects fertilized with waste activated sludges and FYM with the addition of ash, slightly lower from objects on which waste activated sludges and FYM with the addition of ash and CaO were applied, and the lowest from objects on which mixture of FYM and waste activated sludges with the addition of CaO were applied.
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