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Nitrogen inputs by irrigation is a missing link in the agricultural nitrogen cycle and related policies in Europe
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Orientador(es)
Resumo(s)
Irrigation, one of the 28 agri-environmental indicators defined in the European Common Agricultural Policy, is often
neglected in agricultural nitrogen (N) budgets, while it can be a considerable source of N in irrigated agriculture. The
annual N input from irrigation water sources (NIrrig) to cropping systems was quantified for Europe for 2000–2010 at
a resolution of 10 × 10 km, accounting for crop-specific gross irrigation requirements (GIR) and surface- and ground-
water nitrate concentration. GIR were computed for 20 crops, while spatially explicit nitrate concentration in ground-
water was derived using a random forest model. We show that although GIR were relatively stable (46–60 km3 yr-1),
the Nirrig in Europe increased over the 10-year period (184 to 259 Gg N yr-1), approximately 68 % of which occurred
in the Mediterranean region. The main hotspots appeared in areas with both high irrigation requirements and high
groundwater nitrate concentration, reaching up to averaged values of 150 kg N ha-1 yr1. These were mainly located in Mediterranean Europe (Greece, Portugal and Spain) and to a lesser extent in Northern Europe (The Netherlands,
Sweden and Germany). By not including NIrrig, environmental and agricultural policies are underestimating the
real extent of N pollution hotspots in European irrigated systems.
Descrição
Palavras-chave
irrigation water Nitrate pollution nutrient management water management agrienvironmental indicator water balance
Contexto Educativo
Citação
Serra, João, et al. “Nitrogen Inputs by Irrigation Is a Missing Link in the Agricultural Nitrogen Cycle and Related Policies in Europe.” Science of The Total Environment, vol. 889, Sept. 2023, p. 164249
Editora
Elsevier