ABS50419

Effects of rate and form of fertiliser nitrogen applied on the yield, nutritive value and ensilage characteristics of forage maize grown under degradable film


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  • Poster 17 (Flash Talk: 11 Jun 2018 17:06)
  • Foyer, UCD Agriculture and food science Centre
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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, Ireland

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

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

Eugene Brennan
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


Limited information is available comparing forms of fertiliser nitrogen (N) applied, for example foliar-applied and granular N, to forage maize (Zea mays L.) established beneath degradable film. The objective of this study was to investigate the effects of rate and form of fertiliser N applied on the yield, nutritive value and ensilage characteristics of forage maize grown under degradable film. A 4 x 2 factorial arrangement of treatments with three replicate blocks and 8 plots per block was used. Prior to cultivation undiluted cattle slurry was evenly applied using a splash-plate spreader at a rate of 33 m3/ha. At each of four fertiliser N rates (0, 50, 100 and 150 kg N/ha) 50 % was applied at sowing (N1) (granular urea; 460 g N/kg) and 50 % at growth stages V6-V8 (between six to eight leaves with visible collars) (N2) from two N forms granular calcium ammonium nitrate (270 g N/kg) versus foliar N (158 g N/kg). The results showed that fertiliser N application rates above 0 kg N/ha had no effect (P > 0.05) on whole-crop yield, grain yield or whole-crop quality characteristics. There was no effect (P > 0.05) of fertiliser N application form on crop productivity or quality characteristics. There was a substantially higher (P < 0.001) N use efficiency for 0 kg N/ha in comparison to 50, 100 and 150 kg N/ha. The overall lack of response of whole-crop yield and whole-crop N content to fertiliser N application above that initially supplied from cattle slurry (21 kg N/ha) and N mineralization from the soil highlights the need for accurate estimation of the soil N supply when calculating N application rates and possible readjustment of current recommendations.