Proceedings of the Conference on Nitrogen as a Water Pollutant

Introduction Chapter 1. Microbial Transformations of Inorganic Nitrogen Summary The Main Processes Fixation of Elementary Nitrogen in Pure Cultures Fixation in the Aqueous Environment Nitrification in Pure Cultures Nitrification in the Aqueous Environment Nitrate Metabolism in Pure Cultures Nitrate Reduction in the Aqueous Environment Discussion Acknowledgment References Chapter 2. The Analysis of Nitrogen Forms in Waters and Wastewaters Summary Introduction Ammonia Nitrogen Total and Organic Nitrogen Nitrite Nitrate References Chapter 3. Sources of Nitrogen as a Water Pollutant: Industrial Waste Water Relative Importance-of-Various-Sources Industrial Nitrogen Sources Nitrogen Discharges from the Forest Industry Fertilizer Industry The Most Important Nitrogen Discharges Food Processing Industry Summing-up References Chapter 4. Nitrogen in Organic Matter and Fertilizer as a Source of Pollution Summary Methods of Research Fate of Nitrogen in Soil Nitrogen Available to Crops N-Losses by Leaching N - Losses in Subsoil Indirect Effect of Fertilizer Nitrogen on N-Leaching Losses Conclusions References Chapter 5. Nutrient Discharge from a 90 Km2 Watershed Introduction Description of Watershed Measurements Data Treatment Conclusion References Chapter 6. The Influence of Nitrogen Fertilizers on Stream Nitrate Concentrations near Alliston, Ontario, Canada Introduction Study Area Study Methods Results Discussion Comparisons of Stream Nitrate Levels in 1972 and 1974 Conclusion Acknowledgment References Chapter 7. Long Term Studies on Nitrogen in Two Reservoirs Related to Field Fertilization Summary Introduction Localities Method Results Discussion Acknowledgment References Chapter 8. The Contribution of Nutrient from Diffuse Sources Summary Methods Yearly Variation and Average of Nutrient Flux Analysis of the Two Point Measurements in Nørreåen Discussion Notation Acknowledgment References Chapter 9. Nitrate Reduction in the Subsoil Summary Introduction Nitrate Reduction in Soils Description of the Soil Profiles Chemical Analyses of the Profiles Physical Analyses of the Profiles Nitrate Reduction Experiments Conclusion Literature Chapter 10. Simple Methods of Predicting The Leaching of Nitrate from the Root Zone Summary Theory Results and Discussion References Chapter 11. Denitrification in Soils Intermittently Flooded with Sewage Water Summary Procedure Results and Discussion References Chapter 12. The Immobilization of Nitrogen in a Water-Sediment System by Denitrifying Bacteria as A Result of Nitrate Respiration Introduction Materials and Methods Results and Discussion References Chapter 13. A Procedure for the Prediction of Nitrate Levels in Water Supplies in the United Kingdom Summary Current Situation in the United Kingdom Method of Approach to the Problem Processes Which Control Nitrogen Additions and Losses Processes Which Control The Rate of Nitrate Movement Nitrogen and the Water Resource System Availability and Reliability of Data Estimation of Nitrate Levels in a Typical Chalk Catchment Data Requirement Conclusions Acknowledgments References Chapter 14. Joint FAO/IAEA/Federal Republic of Germany International Coordinated Program of Research on Agricultural Nitrogen Residues with Particular Reference to their Conservation as Fertilizers and Behavior as Potential Pollutant Introduction Background Current Status and Objectives Chapter 15.