Nitrate content of soil water under forage crops fertilised with dairy slurry in nitrate vulnerable zone

Vincenzo Tabaglio, Marco Ligabue, Paolo Mantovi

Risultato della ricerca: Contributo in libroContributo a convegno

Abstract

Three contiguous plots established on highly permeable soil in the Po valley (Italy), and equipped with tensiometers and ceramic cup samplers, have been cropped respectively with lucerne (Medicago sativa), tall fescue (Festuca arundinacea), and their mixture. Dairy slurry was applied three times during the second year (at the end of the winter and after the 1st and 4th cut), with total amounts of 272 kg N ha-1 for tall fescue and 136 kg N ha-1 (half rate) for the mixture. Lucerne was not fertilised with nitrogen. Total yields for the 5 cuts were 17.8 t DM ha-1 for lucerne (average protein content 18.2% DM), 10.9 for tall fescue (protein 12.6 % DM) and 19.2 for the mixture (protein 17.0 % DM). Soil water nitrate content was steadily low under each of the three forage crops, with average values ranging from 5 (tall fescue plot) to 10 (lucerne plot) mg NO3-N l-1, without significant negative impact on groundwater. Activities are currently being carried out to verify the effect of repeated application rates higher than the 170 kg N ha-1 year-1 limit fixed for NVZ in Nitrate Directive 91/676.
Lingua originaleEnglish
Titolo della pubblicazione ospitePermanent and Temporary Grassland - Plant, Environment and Economy
Pagine347-350
Numero di pagine4
Stato di pubblicazionePubblicato - 2007
Evento14th Symposium of the European Grassland Federation - Ghent, Belgium
Durata: 3 set 20075 set 2007

Convegno

Convegno14th Symposium of the European Grassland Federation
CittàGhent, Belgium
Periodo3/9/075/9/07

Keywords

  • Festuca arundinacea Schreb.
  • Medicago sativa L.
  • NVZ
  • alfalfa
  • ceramic cups
  • dairy slurry
  • lucerne
  • nitrate leaching
  • nitrate vulnerable zones
  • nitrates
  • tall fescue

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