Performance of mixtures of perennial ryegrass varieties evaluated under animal grazing
2020
Tubritt, T. | Delaby, Luc | Gilliland, T.J. | O'Donovan, M.
In Ireland, perennial ryegrass (Lolium perenne L., PRG) varieties are typically sown as mixtures but evaluation of variety performance takes place in monoculture plots. Two PRG variety studies were conducted to examine the performance of known varieties sown as mixtures under animal grazing. Within each study four varieties were examined. Ploidy was split equally within both studies. The first study contained varieties with a heading date range of nine days (2 June to 10 June). The second study contained varieties with a wider heading date range of eighteen days (23 May to 9 June). The studies were established in 2017 and examined over two grazing seasons. Within both studies, herbage accumulation, grazing efficiency and nutritive value ranking of mixtures differed significantly based on ploidy content. Variety mixtures tended to perform as the mean of the component varieties monoculture performance.
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