"Carl Sprengel, precusor of agricultural chemistry" memorial speach on the occasion of the 200th birthday of P.C. Sprengel; Utilization of organic wastes and its environmental implications; Effects of organic manuring and cropping on soil humus and fertility; Technical aspects of waste management: storage, treatment, handling and land application; Efficient and safe utilization of farm wastes in modern agriculture; The effect of pig slurry on the growth and quality of celery (apium craveolens); Influence of intensive agriculture upon nitrate content of deep soil layers; Upgrading of wastes by separation, composting and additives; The storage of liquid animal waste; Treatment and handling of liquid manure; Possibilities for reducing the heavy metal contentsof municipal wastes; Development of a vermicomposting system; Availability of phosphorus in phosphate-enriched pelleted and granulated organic manures; Agricultural use of nonrural wastes: benefits and limitations; A concept of sewage sludge land disposal in Poland; System for regulation of waste-water and sewage sludge deposition on agricultural land in Hungary; Case study on utilization possibilities of some non-urban waste in agriculture; Use of sewage sludge from tertiary treatment as phosphate fertilizer; Fertilizing effect of sewage sludge on lettuce and rye grass; Uptake of heavy metals by plants from urban refuse compost; Effect of refuse compost on the plant availability of Cd, Cu, Ni, Pb and Zn in contamined soils; Heavy metals in soils and plants ...