Quantification of N-losses as NH3, NO, and N2O and N2 from fertilized maize fields in southwestern France

摘要: Emissions of nitrogen compounds (NO, NH3, N2O and N2) from heavily fertilized (280 kg(N) ha-1) irrigated maize fields were studied over an annual cultivation cycle in southwestern France. NO emissions measured by chamber techniques throughout the year. During fertilization growth periods, measurements intensified complemented flux-gradient micrometeorological NOx NH3. The two methods used, Bowen ratio a simplified aerodynamical techniques, agree quite well quantify NH3 flux variations during period intense emission which followed fertilizer application. Over yearly cycle, loss form calculated using algorithms calibrated with field data (chambers). soil denitrification potential represented N2O/(N2O+N2) was laboratory to calculate total gaseous loss. Taking into account all uncertainties, N atmosphere represents 30 110 ha-1 about less than 1% as 40% NO, 14% 46% N2. This is agreement agronomic budget based on input furniture and, N-output crops crop residues, displays net imbalance 50 100 ha-1.