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Can herbage production be maintained at lower chemical N fertiliser input?

06 January 2021
Type Event Proceeding

Presentation by Dr. Deirdre HennessyTeagasc, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork at the Irish Grassland Association (IGA) Virtual Dairy Conference which took place on Wednesday, 6th January 2021.

View presentation here: Deirdre Hennessy Irish Grassland Association Dairy Conference 2021 (PDF)

Watch Deirdre's presentation below

Watch the full event here


  • Apply slurry with LESS and Spring before Summer –reduce N fertiliser by 15 –20 kg/ha
  • Mid-season –measure and use available information to plan N fertiliser
    • Surplus bales EVERY rotation --> opportunity to reduce N
  • White clover
    • Replace up to 100 kg N/ha or 40% of chemical N fertiliser

Take home messages

  • Optimise soil fertility
  • Make better use of N on your farm
    • Slurry –LESS, spring before summer
    • Plan mid-season N
  • Reseed and over sow clover this year to allow reductions in N fertiliser in summer