Journal of Pest Science (2012) 85, 5-15

Patrick Hann, Claus Trska and Bernhard Kromp (2012)
Effects of management intensity and soil chemical properties on Rumex obtusifolius in cut grasslands in Lower Austria
Journal of Pest Science 85 (1), 5-15
Abstract: Rumex obtusifolius (broad-leaved dock) is a widely distributed weed in managed grasslands and is an indicator for excessive grassland management. Especially in organic farming, its control is highly labour and energy intensive. The effects of management extensification on R. obtusifolius were investigated by on-farm trials with reduced cutting frequencies and manuring amounts from 2004 to 2006 at three sites in Lower Austria. The sites distinctly differed in their nutrient availabilities (LiCl-extract; Ca: ranged from 1,380 to 2,062 mg/kg DM, Mg: 211-611 mg/kg, P: 4-40 mg/kg, K: 57-334 mg/kg). At one site reduced management intensity had a significant decreasing effect on R. obtusifolius infestation, whereas at the other sites no effect was observed. Consequently, extensification as a measure for controlling this weed can be effective under certain conditions. Soil analyses indicated that Ca and Mg concentrations were negatively correlated to R. obtusifolius density, and the site where infestation declined under reduced management was characterised by abundant Ca and Mg in the topsoil. K showed a weak positive correlation with plant density development and P was not related to R. obtusifolius. According to the literature, an abundance of Ca and Mg in the soil could reduce the competitiveness of the species. Consequently, high concentrations of these nutrients might enhance the probability for an effective R. obtusifolius control by management extensification. Further research is required to clarify the influence of Ca and Mg on the competitiveness of R. obtusifolius, and may lead to recommendations for the management of this weed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Patrick Hann

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rumex obtusifolius (weed)	Grasses/turf/rangeland	Austria