The waste activated sludge from Siedlce contained the largest amount of sulphur (7.4 g kg-1 of DM) and the lowest FYM (0.9 g kg-1 of DM). The largest amount of nitrogen was determined as coming from the waste sludge from the poultry processing factory Drosed (89.2 g kg-1 of DM) and the lowest in the FYM (18.7 g kg-1 of DM). During one year of the incubation of the organic materials investigated, the rate of mineralization of sulphur and nitrogen compounds differed greatly and was influenced by the parameters investigated, such as the kind of soil and waste under the activation of sludge as well as the liming process.
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