Long-term performance of white clover varieties grown with perennial ryegrass under rotational grazing by sheep with different nitrogen applications

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dc.contributor.author Williams, T. Andy
dc.contributor.author Abberton, Michael T.
dc.contributor.author Evans, D. R.
dc.contributor.author Rhodes, Ian
dc.date.accessioned 2009-11-10T13:10:26Z
dc.date.available 2009-11-10T13:10:26Z
dc.date.issued 2003-03
dc.identifier.citation Williams , T A , Abberton , M T , Evans , D R & Rhodes , I 2003 , ' Long-term performance of white clover varieties grown with perennial ryegrass under rotational grazing by sheep with different nitrogen applications ' Journal of Agricultural Science , vol 140 , no. 2 , pp. 151-159 . , 10.1017/S0021859603263243 en
dc.identifier.issn 1469-5146
dc.identifier.other PURE: 137727
dc.identifier.other dspace: 2160/3483
dc.identifier.uri http://hdl.handle.net/2160/3483
dc.description Williams, T. A., Evans, D. R., Rhodes, I., Abberton, M. T. (2003). Long-term performance of white clover varieties grown with perennial ryegrass under rotational grazing by sheep with different nitrogen applications.   Journal of Agricultural Science, 140, (2), 151-159. Sponsorship: DEFRA en
dc.description.abstract Three experiments were carried out to investigate the dry matter production of nine white clover (Trifolium repens L.) varieties grown with the same variety of perennial ryegrass (Lolium perenne L.) and subjected to rotational grazing by sheep over a period of 10 years. The experiments differed only in the nitrogen fertilizer added: no nitrogen, 100 kg/ha per year and 200 kg/ha per year. Dry matter (DM) yields of white clover and perennial ryegrass components of the sward were recorded at approximately 6-week intervals during the growing season. Without applied nitrogen, 10-year mean white clover annual DM yields ranged from 2·89–4·54 t/ha. Mean clover content for all varieties ranged from 31–50% for the first 9 years, declining to 20% in the 10th year. The most consistently high yielding variety, AberVantage, gave yields greater than 3·5 t/ha in every year. Similar results were observed for the variety Aran. The 10-year mean annual DM yield of the perennial ryegrass companion (variety Talbot) ranged from 4·41–5·57 t/ha depending on the white clover variety in the mixture. Variation in perennial ryegrass DM yield was of a similar range and pattern as for white clover. In the experiment in which 100 kg N/ha per year was added, 10-year mean white clover annual DM yields ranged from 2·27–3·87 t/ha. The varieties AberVantage and Aran showed yields that fell below 3 t/ha per year in only 1 or 2 years, respectively. Mean clover content for all varieties ranged from 26–38% for the first 9 years, declining to 17·5% in the 10th year. There was no consecutive annual decline in white clover DM yields. The 10-year mean annual DM yields of the perennial ryegrass companion ranged from 6·03–7·57 t/ha. With applied nitrogen fertilizer of 200 kg N/ha per year (Experiment 3), 10-year mean white clover annual DM yields ranged from 1·21–2·67 t/ha. Mean clover content ranged from 12–27% for the 10 years. AberVantage and Aran showed yields consistently above 2 t/ha. No general decline in white clover DM yields was observed although some varieties showed consecutive annual reductions in years 8, 9 and 10. The 10-year mean annual DM perennial ryegrass yields ranged from 7·27–8·68 t/ha. The results show that, under rotational grazing by sheep, white clover can give reliably high yields over a 10-year period. With moderate to high applications of nitrogen fertilizer white clover yields were lower than without nitrogen but they were consistent and sufficient to make a considerable impact on forage quality. There was no evidence for a general decline in clover content until the 10th year of the experiment and no cyclical pattern of annual variation in white clover yield was observed. The implications of these results for the role of white clover in UK agriculture are discussed. en
dc.format.extent 9 en
dc.language.iso eng
dc.relation.ispartof Journal of Agricultural Science en
dc.title Long-term performance of white clover varieties grown with perennial ryegrass under rotational grazing by sheep with different nitrogen applications en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1017/S0021859603263243
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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