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dc.contributor.authorO'Donovan, Michael*
dc.contributor.authorDelaby, Luc*
dc.contributor.authorStakelum, G.*
dc.contributor.authorDillon, Pat*
dc.date.accessioned2014-03-03T12:50:24Z
dc.date.available2014-03-03T12:50:24Z
dc.date.issued2004
dc.identifier.citationM. O’Donovan, L. Delaby, G. Stakelum, P. Dillon. Effect of autumn/spring nitrogen application date and level on dry matter production and nitrogen efficiency in perennial ryegrass swards. Irish Journal of Agricultural and Food Research. 43: 31-41, 2004en_GB
dc.identifier.issn0791-6833
dc.identifier.urihttp://hdl.handle.net/11019/540
dc.descriptionpeer-revieweden_GB
dc.description.abstractThe influence of autumn/spring N-application date and level on grass dry matter (DM) production in spring and on N uptake, recovery and efficiency were examined over 3 years (1998, 1999 and 2000, identified as Year 1, 2 and 3, respectively). Seven N-application dates were investigated in years 2 and 3 while four application dates were investigated in Year 1. The application dates were 21 October (T1), 11 November (T2), 2 December (T3), 23 December (T4), 12 January (T5), 3 February (T6) and 23 February (T7). Three N-application rates (kg N/ha) were used: 30 (N30), 60 (N60) and 90 (N90) plus a zero-N control (N0). Herbage DM yields were determined on: 18 March (H1) and 8 April (H2). Two herbage masses (HM) (40 mm above ground level) at initial Napplication date were investigated: a high HM (HHM) of 500 kg DM/ha and a low HM (LHM) of 100 kg DM/ha. The HM at initial N-application date in Year 1 was HHM, in Year 2 LHM and in Year 3 both HHM and LHM. There was a significant effect of Year (P<0.001), HM (P<0.001), N-application date (P<0.001) and N level (P<0.001) on DM production at both H1 and H2. At H1 there was a significant interaction between N-application date and level for DM production. N-application date had a significant (P<0.001) effect on N recovery at both H1 and H2. The highest N recovery rate at the two harvest dates was at T5, while the lowest was at T1 and T2. At H1 and H2 there was a significant effect (P<0.001) of application date on response to applied N. The responses were 7.5, 8.0, 8.3, 12.0, 15.7, 7.3 and 5.6 (kg DM/kg N) (s.e. 1.88) for T1 to T7,respectively, at H1, while the corresponding values at H2 were 10.3, 8.7, 6.1, 15.2, 17.6,11.4 and 15.1 (s.e. 1.88). At H2 the response to applied N was 15.6, 11.5 and 9.1 (kg DM/kg N) for N30, N60 and N90, respectively (P<0.05). Regression analysis indicated that highest DM production was achieved with T5 for both H1 and H2 harvest dates, while the lowest responses were associated with T1, T2 and T3 application dates.en_GB
dc.language.isoenen_GB
dc.publisherTeagascen_GB
dc.relation.ispartofseriesIrish Journal of Agricultural and Food Research;vol 43
dc.subjectNitrogenen_GB
dc.subjectResponseen_GB
dc.subjectSpring Grassen_GB
dc.titleEffect of autumn/spring nitrogen application date and level on dry matter production and nitrogen efficiency in perennial ryegrass swardsen_GB
dc.typeArticleen_GB
dc.identifier.rmisMKDC-0252-5227
dc.contributor.sponsorNational Development Plan 2000–2006


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