part SECTION 1. ORIGIN OF NITRATES IN GROUNDWATER -- chapter 1 Agricultural activities as a source of nitrates in groundwater / chapter 2 Nitrate time-evolution in the waters of the Quaternary aquifer of Vitoria-Gasteiz (Basque Country, Northern Spain) — influence of wetlands / chapter 3 Origin of nitrates in water inflows in Pb—Zn ore mines -- chapter 4 Nitrate in groundwater as an indicator of farmstead impacts on the environment / part SECTION 2: EXPERIMENTAL INVESTIGATIONS OF NITRATES IN GROUNDWATER -- chapter 5 Spatial distribution of nitrate in Cenozoic sedimentary aquifers controlled by a variable reactivity system -- chapter 6 Field investigation of nitrogen in unsaturated and saturated zones -- chapter 7 Nitrate in groundwater from renaturalized and managed peatlands -- chapter 8 Estimating microbial denitrification parameters from in situ bioreactor operation under groundwater conditions / chapter 9 Denitrification in a karst aquifer with matrix porosity / part SECTION 3. MODELLING OF NITRATE TRANSPORT AND CHEMISTRY -- chapter 10 Development of a groundwater abstraction modelling environment for drinking water supply / chapter 11 Groundwater-borne nitrate intakes into the river Elbe (German part) / chapter 12 Development of tools needed for an impact analysis for groundwater quality due to changing of agricultural soil use / chapter 13 Modelling of nitrate leaching to groundwater under Slovenian conditions / part SECTION 4: NITRATE POLLUTION OF GROUNDWATER — NATIONAL AND REGIONAL STUDIES -- chapter 14 Nitrate reduction and pyrite oxidations in the Netherlands / chapter 15 Nitrate and nitrite in shallow groundwater / chapter 16 Nitrate variations in aquifers: a case study from the Neogene aquifers of Trifilia, SW Peloponnesus, Greece / chapter 17 Nitrate pollution and quality degradation of Ionian coastal groundwater (Southern Italy) / chapter 18 Nitrates in water of the vadose and phreatic zones, Cracow Jurassic — Poland -- chapter 19 Nitrate in Danish groundwater -- chapter 20 Nitrates in fresh water in the Miechow Region, Poland / chapter 21 Nitrate pollution of groundwater in Flanders (Belgium) / part SECTION 5: MONITORING AND PROTECTION OF GROUNDWATER FROM NITRATE POLLUTION -- chapter 22 Agricultural nitrate contamination in groundwater in England and Wales: an overview -- chapter 23 Can we manage the nitrate concentration in the Ljubljana Field aquifer (Slovenia)? / chapter 24 Nitrate monitoring and CFC-age dating of shallow groundwaters — an attempt to check the effect of restricted use of fertilisers / chapter 25 Reducing nitrate leaching from arable agriculture: preliminary results from the Netherlands / chapter 26 Water and agriculture management: environmental problems in the Fucino Plain (central Italy) -- chapter 27 Nitrate monitoring in groundwater of Dutch provinces.