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Publication Date
1977
Description
Pastures were continuously grazed by sheep for four years at six stocking rates on the Kangaroo Island Research Centre, South Australia. Changes in botanical composition in a renovated pasture sown to Lolium perenne cv. Victorian and subterranean clover (Trifolium subterraneum) cvv. Mt. Barker and Woogenellup, are discussed in relation to the replacement of the oestrogenically-potent subterranean clover cv. Yarloop. There was a consistent within-year and between-year decline in the perennial ryegrass component and this was associated with concurrent invasion by vigorous, exotic, annual species mainly of Mediterranean origin. The lack of persistence of the perennial ryegrass indicates little hope of overcoming the problem of ewe infertility related to Yarloop subterranean clover dominance by sowing this grass on Kangaroo Island.
Citation
Gibson, P R., "Persistence of perennial ryegrass under grazing in a Mediterranean-type environment of South Australia" (1977). IGC Proceedings (1977-2023). 15.
(URL: https://uknowledge.uky.edu/igc/1977/sess5/15)
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Persistence of perennial ryegrass under grazing in a Mediterranean-type environment of South Australia
Pastures were continuously grazed by sheep for four years at six stocking rates on the Kangaroo Island Research Centre, South Australia. Changes in botanical composition in a renovated pasture sown to Lolium perenne cv. Victorian and subterranean clover (Trifolium subterraneum) cvv. Mt. Barker and Woogenellup, are discussed in relation to the replacement of the oestrogenically-potent subterranean clover cv. Yarloop. There was a consistent within-year and between-year decline in the perennial ryegrass component and this was associated with concurrent invasion by vigorous, exotic, annual species mainly of Mediterranean origin. The lack of persistence of the perennial ryegrass indicates little hope of overcoming the problem of ewe infertility related to Yarloop subterranean clover dominance by sowing this grass on Kangaroo Island.
