ABS53597

Response of forage maize on a high mineral N soil to strategies of nitrogen use and degradable film


  • Oral Presentation
  • Agriculture and Soil Science
  • 11 Jun 2018 16:05
  • FS-G01, UCD Agriculture and food science Centre
  • View all IPSAM abstracts

Eamon Corcoran*
School of Agriculture and Food Science, University College Dublin, Lyons Research Farm, Celbridge, Naas, Co. Kildare, Ireland

Padraig O Kiely
AGRIC, Teagasc, Grange, Co. Meath, Irelan

Trevor Gilliland
Agri-Food and Biosciences Institute Hillsborough, Co. Down, N. Ireland.

Eugene Brennan
School of Agriculture and Food Science, University College Dublin, Lyons Research Farm, Celbridge, Naas, Co. Kildare, Ireland

James Burke
School of Agriculture and Food Science, University College Dublin, Lyons Research Farm, Celbridge, Naas, Co. Kildare, Ireland

Bridget Lynch
School of Agriculture and Food Science, University College Dublin, Lyons Research Farm, Celbridge, Naas, Co. Kildare, Ireland

*Presenting Author


In Ireland the current nitrogen (N) input strategy for forage maize (Zea mays L.) is to apply and incorporate organic and inorganic fertiliser into the seedbed immediately before sowing. This, however exposes N to losses in the form of leaching, immobilisation, denitrification and clay fixation. To explore the potential to reduce such losses, the objective of this experiment was to investigate the effects of N application strategy across a series of rates of N input and when maize was sown beneath two types of degradable film, a split-plot design with three replicate blocks was used. N was applied entirely at sowing as urea (460 g N/kg) versus 50% at sowing as urea (460 g N/kg) and 50% as foliar applied N (158 g N/kg) at growth stage V6-V8), at application rates of 0, 50, 100, 150 kg N/ha. Degradable film types were medium degradable film (MDF) and high degradable film (HDF). The MDF resulted in greater whole-crop yield (P < 0.01), grain yield (P < 0.05), whole-crop yield of N harvested (P < 0.01) and N use efficiency (P < 0.001) compared to HDF. Applying 100% of fertiliser N at sowing resulted in higher whole-crop yield (P < 0.001), stover yield (P < 0.05), whole-crop N harvested (P < 0.001) and N use efficiency (P < 0.01) compared to N application 50% at sowing and 50% at growth stage V6-V8. However, this latter strategy resulted in an increase (P < 0.001) in starch content and metabolisable energy (P <0.05) due to reduced stover yield (P < 0.05). There was an increase (P < 0.01) in whole-crop yield with increasing N application, but the relatively low response rate of 8.4 kg dry matter/kg fertiliser N applied reflects the high soil mineral status of the experimental site.