, Volume 33, Issue 3, pp 787–800 | Cite as

Selection for yield in Lolium perenne. II. performance of spaced plant selections under competitive conditions

  • M. D. Hayward
  • J. L. Vivero


The performance of six lines of perennial ryegrass (Lolium perenne L.) which had been selected for three generations for production under spaced plant conditions were assessed under increasing levels of competition, namely spaced plants, drills, miniplots and large sown plots. Successful selection for yield under spaced plant conditions was not accompanied by comparable production patterns in the alternative managements. The extreme situation occurred in swards where a significant decline in production was encountered. Negative or no relationships were found in the establishment year between spaced plant production and yield in the alternative conditions whereas in the first harvest year positive correlations occurred between spaced plants, drills and miniplots and only the latter with plots. These varying patterns of performance are considered in relation to the prediction of sward behaviour and the appropriate environment for selection.

Index words

Lolium perenne perennial ryegrass selection yield evaluation competitive conditions 


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Copyright information

© Dr. H. Veenman en Zonen B.V 1984

Authors and Affiliations

  • M. D. Hayward
    • 1
  • J. L. Vivero
    • 1
  1. 1.Welsh Plant Breeding StationAberystwythWales, UK

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