This book contains the papers presented at a Nato Advanced Re search Workshop entitled "DENITRIFICATION IN THE N-CYCLE," held in Braunschweig (W-Germany) from 24 to 27 Mai 1983. All expenses were provided by the North Atlantic Treaty Organization. The scientific programme was in the first instance planned by some members of the Eco-Science Panel under the stimulating organization of Dr. Oscar Ravera and the final programme was prepared in co-operation between Ravera and myself. However, even during the meeting important con tributions were added. The meeting was hosted by the Microbiologi cal Dept. of F.A.L., which also took care of the organizatory as pects. Nitrate is constantly lost from both terrestial and aquatic ecosystems, causing rnixed feelings between ecologists and agricul turists. While bacteriologically very rnuch is known, the ecology of the processes is still poorly understood, nor can it be evaluated what it rneans as an econornic loss for farrners and world food produc tion. Therefore this NATO Advanced Workshop was established to per mit a lirnited nurnber of scientists active in this field to corne to gether for a short while to address the following objectives: 1) To exchange ideas between scientists (bacteriologists and ecologists) and agronornists. 2) To assess the state of the art. 3) To discuss the difficulties of experimentation in the field. 4) To define future research. In order to accornplish these objectives, the workshopwas organ ized in three parts with the following thernes: 1) Bacteriological aspects of dentrification.

Inhalt

1. Denitrification: Appraisal and Concluding Remarks.- The Denitrifying Bacteria.- 2. Effects of Environmental Factors on Denitrification.- 3. Microbiology of Denitrification and other Processes Involving the Reduction of Oxygenated Nitrogenous Compounds.- 4. Diversity of Denitrifiers and their Enzymes.- 5. Genetics of Denitrification in Pseudomonas Aeruginosa and Stutzeri.- 6. Current Methods used to estimate N2O and N2 Emissions from Field Soils.- 7. Influence of pH and Partial Oxygen Pressure on the N2O-N to N2 Ratio of Denitrification.- 8. Denitrification Loss from Managed Grassland.- Denitrification in Agriculture.- 9. N2O-Formation during Soil Cropping.- 10. Nitrate Reduction in the Subsoil.- 11. Preliminary Field Denitrification Studies of Nitratefertilized and Nitrogen-fixing Crops.- Denitrification in Aquatic Environments.- 12. Significance of Denitrification on the Strategy for Preserving Lakes and Coastal Areas against Eutrophication.- 13. Marine Denitrification.- 14. Denitrification in Freshwaters.- 15. Application of Denitrification in the Wastewater Treatment.- 16. Denitrification by Methanotrophic/Methylotrophic Bacterial Associations in Aquatic Environments.- 17. Simultaneous Nitrification and Denitrification in Lake Erken Sediments.