Influence of crop rotation and herbicide dosage on the weed infestation
Schwarz, Jürgen | Pallut, Bernhard | Moll, Eckhard
In long-term field trials focusing on plant protection, effects of different herbicide dosages on the population dynamics of weeds were tested for twelve years (1996 up to 2007) in two crop rotations (67 % and 50 % cereals in the rotation). Also low doses und no herbicide application were investigated. In autumn 2007, the long-term field trials were rearranged based on the experience of these two crop rotations. A new crop rotation and two herbicide treatments, good agricultural practice and integrated farming, were established on the plots. Prior to the herbicide treatment in either autumn or spring, weeds were counted by species and number. Effects on the weed occurrence in the different crop rotations can be observed even after three years. There are still less dicotyledonous weeds in the former fodder crop rotation than in the former cash crop rotation. The variants always treated with herbicides still have a lower dicotyledonous weed infestation compared to the formerly untreated ones. The two different pesticide intensities are also still visible in the dicotyledonous weed occurrence. The effects on monocotyledonous weeds (Apera spica-venti) are not clearly observable. Nevertheless, the fodder crop rotation has a lower occurrence of Apera spica-venti than the cash crop rotation.
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