Entwicklung des Unkrautaufkommens bei unterschiedlicher Stoppelbearbeitung im Ausschnitt einer ökologischen Fruchtfolge

Summary

A long-term experiment at the Experimental Station for Organic Farming
Kleinhohenheim should determine effects of stubble tillage on weed density and weed
communities. The treatments were stubble tillage by a chisel plough (10 cm), a
modified skimmer plough (7 cm), a rotary hoe (5 cm) and a control, previous to
primary tillage by a mouldboard plough in autumn. The results presented here refer to
the weed density of dicotyledonous-annual plants, monocotyledonous plants and
lucerne volunteers in the years 8 and 9 of the experiment, i.e. the first two years after
perennial lucerne grass. There were no significant differences found between the
treatments for weeds, volunteers and crop yield of winter wheat and oats. These
results confirm and continue the observations of the years 1999-2003 in the long run.
Stubble tillage had no visible effect on the density of annual weeds in a diverse, 8-year
organic crop rotation with focus on cereals if a plough was used for primary tillage.