We investigated the influences of fertilization using fresh and composted sewage sludge with the addition of calcium oxide, brown coal ash, straw, and sawdust on the yield and nitrogen content in maize biomass, as well as the values of utilization coefficient. The biomass yields of maize fertilized with only sewage sludge, as well as sludge with brown coal ash and sawdust, were similar. Lower yields were achieved when sewage sludge with calcium oxide and straw were used. Amounts of harvested maize biomass from objects fertilized with fresh and composted sewage sludge were similar. The highest efficiency of 1g nitrogen was recorded when the mixture of sewage sludge with brown coal ash was applied. The largest nitrogen concentrations were observed in maize amended with sewage sludge with calcium oxide, while slightly less – after adding the sewage sludge only and sludge with brown coal ash. The lowest nitrogen content was determined in biomass harvested from objects fertilized with mixtures of sewage sludge with sawdust and straw. The coefficient values of nitrogen utilization by maize were similar for all three series of experiments on objects fertilized with the sewage sludge only as well as sludge with calcium oxide and brown coal ash addition; slightly lower values were recorded when sewage sludge plus sawdust and straw were added. No significant influence of composting the sewage sludge from Siedlce on nitrogen content and its utilization coefficient for nitrogen was observed. On the other hand, composted sewage sludge from Łuków enhanced the content and nitrogen utilization by the test plant.