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A comparison of disaggregated nitrogen budgets for Danish agriculture using Europe-wide and national approaches
- Kros, Johannes, Hutchings, Nicholas J., Kristensen, Inge Toft, Kristensen, Ib Sillebak, Børgesen, Christen Duus, Voogd, Jan Cees, Dalgaard, Tommy, de Vries, Wim
- The Science of the total environment 2018 v.643 pp. 890-901
- European Union, agricultural statistics, excretion, fertilizers, leaching, mineralization, models, national budget, nitrogen, nitrogen fixation, plant cultural practices, pollution, runoff, uncertainty, Denmark
- Spatially detailed information on agricultural nitrogen (N) budgets is relevant to identify regions where there is a need for a reduction in inputs in view of various forms of N pollution. However, at the scale of the European Union, there is a lack of consistent, reliable, high spatial resolution data necessary for the calculation of regional N losses. To gain insight in the reduction in uncertainty achieved by using higher spatial resolution input data. This was done by comparing spatially disaggregated agricultural N budgets for Denmark for the period 2000–2010, generated by two versions of the European scale model Integrator, a version using high spatial resolution national data for Denmark (Integrator-DK) and a version using available data at the EU scale (Integrator-EU). Results showed that the national N fluxes in the N budgets calculated by the two versions of the model were within 1–5% for N inputs by fertilizer and manure excretion, but inputs by N fixation and N mineralisation differed by 50–100% and N uptake also differed by ca 25%, causing a difference in N leaching and runoff of nearly 50%. Comparison with an independently derived Danish national budget appeared generally to be better with Integrator-EU results in 2000 but with Integrator-DK results in 2010. However, the spatial distribution of manure distribution and N losses from Integrator-DK were closer to observed distributions than those from Integrator-EU. We conclude that close attention to local agronomic practices is needed when using a leaching fraction approach and that for effective support of environmental policymaking, Member States need to collect or submit high spatial resolution agricultural data to Eurostat.