Abstract
Nitrous oxide (N 2O) emission was measured weekly over a period of one year (1994) on a grassland, a maize field and a permanent pasture. Therefore, the closed box method was used. To estimate the total (N 2O+N 2) loss, also soil cores were taken for incubation in the presence of acetylene. N 2O fluxes were highest in the grazed grassland (11.9 kg N. −1.435 days −1) because of the high nitrogen input (fertilization, deposition of urine and dung by cattle), a higher soil compaction and relatively high moisture content. N 2O losses out of the temporary grassland (3.35 kg N.ha −1.312 days −1) and maize field (2.7 kg N.ha −1.312 days −1) were significantly lower. This is attributed to a lower N input and the fact that these 2 fields were very well managed (controlled fertilization, good drainage system, lower compaction,…). From an agronomic point of view, N-losses as N 2O are small and not important to take into consideration. Besides, these small N 2O fluxes can have a negative influence on the environment.
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