Congresses Environmental aspects -- Pesticides -- Pesticide residues in food -- Agricultural chemicals -- Agricultural wastes -- Data processing -- Disinfection -- Environmental aspects Feeds -- Food contamination -- Food, Irradiation Freshwater ecology -- Insect sterilization -- Mathematical models -- Nitrates -- Nitrogen fertilizers -- Pesticide residues in food Pollution -- Radiation preservation of food Radiation preservation of food -- Radiation sterilization -- Radioactive tracers in agriculture -- Soil ecology --