oa Agriprobe - Weed invasion of no-till, Pennisetum clandestinum pastures following over-sowing with Lolium spp. by means of mulching

Volume 9, Issue 1
  • ISSN : 1810-9799



The damage that weeds have on dairy production system from kikuyu-ryegrass pastures in the Southern Cape region of South Africa is not known. Once a year, the kikuyu ground-cover is mulched and oversown with ryegrass. Directly after mulching, various weeds emerge and often form dense plant populations, likely to have a considerable effect on pasture productivity. The aim of this study was to determine the change and severity of weed species composition in established kikuyu-ryegrass pastures as affected by oversowing with ryegrass by means of mulching. Weed occurrence was assessed before mulching, after mulching and before first graze. The control treatment was not mulched, but assessed the same day the weeds were assessed after mulching. A total of 12 weed species were recorded in the pasture. Low weed numbers were detected in soil that was not mulched. Emergence of four annual weed species was affected by mulching, of which Urtica urens and Stellaria media were quantatively most important. Weed control measures for pastures heavily infested with U. urens and S. media needs to be considered. Perennial weeds was not affected by mulching.

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