Site specific nitrogen fertilisation recommendations based on simulation

For two fields, site specific nitrogen recommendations were calculated based on the simulation of crop growth and nitrogen dynamics using the spatial distribution of relevant soil and terrain characteristics. On one field, a retrospective calculation of yield response on fertilisation showed differences of yield response between single locations. Model-derived recommendations and real management performance were compared. For the other field, real time model recommendations were derived for two years. Compared with a Nmin/Hydro-N-sensor based method, the model-based strategy yielded savings of 40 kg ha^-1 for both years without grain yield reduction.