Summary
Abstract The objectives of this field trial were to collect reliable measurement data on N 2 emissions and N 2 O/(N 2 O + N 2 ) ratios in typical German crops in relation to crop development and to provide a dataset to test and improve biogeochemical models. N 2 O and N 2 emissions in winter wheat (WW, Triticum aestivum L.) and sugar beet (SB, Beta vulgaris subsp. vulgaris ) were measured using the improved 15 N gas flux method with helium–oxygen flushing (80:20) to reduce the atmospheric N 2 background to < 2%. To estimate total N 2 O and N 2 production in soil, production-diffusion modelling was applied. Soil samples were taken in regular intervals and analyzed for mineral N (NO 3 − and NH 4 + ) and water-extractable Corg content. In addition, we monitored soil moisture, crop developm
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