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Description
Berber orchard grass can negatively affect vine growth and yield. In a previous field study, growth and yield of own-rooted Cabernet Sauvignon vines was reduced over 50 when Berber orchard grass was used as a cover crop. Competition between cover crop and vines for available soil moisture or allelopathic interactions between the cover crop and vines may be responsible for this result. The purpose of this experiment was to investigate interactions between Berber orchard grass and potted Cabernet Sauvignon rootings under controlled conditions. Vines were grown in 18.9-L containers in a greenhouse for 66 days. Water and nutrients were differentially supplied to treatments through the drip irrigation system. Treatments included control, grass cover, and killed cover. Berber orchard grass did not have a consistent effect on vine water relations. However, shoot length and dry matter of shoots was significantly reduced by Berber orchard grass. These data suggest that mechanisms other than competition are responsible for the observed reduction in vine growth when Berber orchard grass is used as a cover crop.
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