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    • IJAFR, volume 48, 2009
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    • Irish Journal of Agricultural & Food Research
    • IJAFR, volume 48, 2009
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    Influence of testing procedure on evaluation of white clover (Trifolium repens L.)

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    Author
    Gilliland, T. J.
    McGilloway, D.
    Conaghan, Patrick
    Keyword
    Cutting
    Grazing
    Persistency
    White clover
    Yield
    Date
    2009
    
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    URI
    http://hdl.handle.net/11019/652
    Citation
    T.J. Gilliland, D. McGilloway and P. Conaghan. Influence of testing procedure on evaluation of white clover (Trifolium repens L.) Irish Journal of Agricultural and Food Research 48: 227–242, 2009
    Abstract
    This study examined data sets derived from the white clover cultivar evaluation programmes of AFBI (N. Ireland), and DAFF (Republic of Ireland) to determine whether elite performing genotypes are identifiable, independent of test procedure and leaf size factors. Genetic variation in yield and persistency, independent of the leaf size continuum effect, was observed. Identification of elite cultivars by breeders or testers therefore required readjustment of assessment standards to account for the mostly curvilinear relationships between performance and leaf size. The different testing procedures, involving cutting or grazing at different heights, frequencies and nitrogen rates changed the relative performances between the cultivars, making it difficult to predict performance potential beyond specific test conditions. The underlying causes for these changes in rankings was considered, including sensitivity to season and location, the antagonistic affects of defoliation pressure and companion grass competition, the independence of different seasonal profiles and the probable role of other morphological characteristics. In is concluded that testing authorities must calculate the management by leaf size relationships to adjust pass/fail standards if elite performing cultivars are to be correctly indentified.
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    Grassland Science
    IJAFR, volume 48, 2009

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