INFLUENCE OF PROCESSED SEWAGE SLUDGE ON NITROGEN CONTENT IN PLANTS AND SOILS

The influence of vermicomposts in different stages of decomposition on the content, intake, and utilization of nitrogen by Italian ryegrass as well as the element accumulation in the soil after two years of a pot experiment was examined. The vermicomposts were produced on the basis of sewage sludge with various waste material additives and their fresh mixtures. A total biomass yield of the grass cultivated in sand was higher if plants were fertilized with vermicomposts made of sewage sludge with other waste material additives than that of plants treated with fresh mixtures of these materials. Sludge vermicomposted for four months and sludge vermicomposted with peat and poultry droppings additives for two months proved to promote the intake of nutrients and, improved the coefficient of their utilization. Fertilization with two-month-old vermicomposts led to higher nitrogen accumulation in the soil.